Artykuły w czasopismach: „Ni Nanowire”

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Rai, Rajesh K., i Chandan Srivastava. "Nonequilibrium Microstructures for Ag–Ni Nanowires". Microscopy and Microanalysis 21, nr 2 (6.02.2015): 491–97. http://dx.doi.org/10.1017/s1431927615000069.

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AbstractThis work illustrates that a variety of nanowire microstructures can be obtained either by controlling the nanowire formation kinetics or by suitable thermal processing of as-deposited nanowires with nonequilibrium metastable microstructure. In the present work, 200-nm diameter Ag–Ni nanowires with similar compositions, but with significantly different microstructures, were electrodeposited. A 15 mA deposition current produced nanowires in which Ag-rich crystalline nanoparticles were embedded in a Ni-rich amorphous matrix. A 3 mA deposition current produced nanowires in which an Ag-rich crystalline phase formed a backbone-like configuration in the axial region of the nanowire, whereas the peripheral region contained Ni-rich nanocrystalline and amorphous phases. Isothermal annealing of the nanowires illustrated a phase evolution pathway that was extremely sensitive to the initial nanowire microstructure.

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Kim, Joondong, Jong-Uk Bae, Wayne A. Anderson, Hyun-Mi Kim i Ki-Bum Kim. "Solid-state growth of nickel silicide nanowire by the metal-induced growth method". Journal of Materials Research 21, nr 11 (listopad 2006): 2936–40. http://dx.doi.org/10.1557/jmr.2006.0364.

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Unique nanowire growth was accomplished at 575 °C by the metal-induced growth (MIG) method. This involved a spontaneous reaction between metal and Si. The deposited metal worked as a catalyst layer to grow nanowires in the solid state. Various metals (Ni, Co, and Pd) were used in MIG nanowire fabrication, and the Ni-induced case was successful in demonstrating that metal species should be the dominant factor for growing nanowires. The Ni to Si composition was studied by energy dispersive spectroscopy showing the Ni diffusion inside the nanowire as well as the Ni silicide layer. The practical application of the MIG nanowire was proved by fabricating nanoscale contacts.

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He, Li Zhong, Li Rong Qin, Jian Wei Zhao, Yu Yang i Ying Ying Yin. "Preparation of Pt/Ni Multilayer Nanowires with Enhanced Magnetic Property and Electrocatalytic Activity". Journal of Nano Research 40 (marzec 2016): 20–28. http://dx.doi.org/10.4028/www.scientific.net/jnanor.40.20.

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Pt/Ni multilayer nanowire arrays were successfully fabricated inside the nanochannels of anodic aluminum oxide template by pulse electrodeposition method. The morphologies of the Pt/Ni nanowires were analyzed, which revealed that these nanowires had smooth surface and uniform diameter of about 70 nm. The ferromagnetic Ni layers were separated periodically by Pt layers along the axis of the nanowires. Magnetization measurements on the Pt/Ni nanowire arrays revealed a stronger magnetic anisotropy with the easy axis parallel to the nanowires. Following electrochemical performance tests indicated that the Pt/Ni multilayer nanowires comprising Pt and Ni layers showed enhanced electrocatalytic activity for methanol oxidation, as compared with pure Pt nanowires.

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Zuo, Yan, Juan Tang, Xiao Tian Li, Yan Zhao, Hai Lan Gong i Shi Lun Qiu. "Electrodeposition of Ni and Ni-Cu Nanowires in Rectified Porous Anodic Alumina Membrane". Materials Science Forum 663-665 (listopad 2010): 1121–24. http://dx.doi.org/10.4028/www.scientific.net/msf.663-665.1121.

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Highly ordered Ni and Ni-Cu nanowires were electrodeposited into the micropores of the porous anodic alumina (PAA) template which was fabricated by the method of two-step anodizing and the thickness of barrier layer which was formed during the anodizing process was rectified by applying current limited anodization steps. The X-ray diffration (XRD) was used to characterize the Ni and Ni-Cu nanowires and the morphology of these nanowires was examined by the way of scanning electron microscopy (SEM). The SQUID magnetometry was used to investigate the magetic properties of the nanowires. It is found that the coercivity and remanence ratio of Ni-Cu nanowire is larger than that of Ni nanowire.

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Lee, Sun Sook, Hyun Jin Kim, Taek-Mo Chung, Young Kuk Lee, Chang Gyoun Kim i Ki-Seok An. "Fabrication of Nanocomposite Based on ZnO Nanowire". Journal of Nanoscience and Nanotechnology 8, nr 9 (1.09.2008): 4895–98. http://dx.doi.org/10.1166/jnn.2008.ic80.

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ZnO-NiO core–shell nanowires and Ni-ZnO nanoparticle–nanowire composites have been synthesized by atomic layer deposition (ALD) and H2 thermal reduction, respectively. Grown ZnO nanowires on Si substrates by vapor transport method were used as templates for the growth of NiO layers. In order to prevent interfacial interaction between deposited NiO and ZnO nanowires templates by the reaction at low temperature and to precisely control the thickness of NiO layer, ALD technique was suitably employed to form the ZnO-NiO core–shell nanowires. All surface area of ZnO nanowires was completely and uniformly covered by amorphous NiO layers at low temperature of 130 °C. The Ni-ZnO nanoparticle–nanowire composites were achieved by the thermal reduction of the ZnO-NiO core–shell nanowires at H2 atmosphere. The density of Ni nanoparticles on ZnO nanowires was roughly related to the pre-deposited NiO thickness and the inter-diffusion of Ni into the ZnO nanowire was not observed.

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Azmy, Ilham, i Jun Wang. "Construction of Hierarchical CuCo2O4-Ni(OH)2 Core-Shell Nanowire Arrays for High-Performance Pseudocapacitors". Aceh International Journal of Science and Technology 11, nr 1 (30.04.2022): 85–95. http://dx.doi.org/10.13170/aijst.11.1.24181.

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The hierarchical CuCo2O4-Ni(OH)2 core-shell nanowire arrays on Ni foam were fabricated using facile and cost-effective two-step hydrothermal synthesis. The growth of CuCo2O4 nanowires was developed on Ni foam as the apposite basis of the conductive scaffold, and the ultrathin Ni(OH)2 nanowires were subsequently immobilized to form CuCo2O4-Ni(OH)2 core-shell nanowire arrays (NWAs). The prepared materials were further characterized in structural, morphological, and electrochemical properties. The obtained CuCo2O4-Ni(OH)2 pseudocapacitor electrode, incorporated by unique core-shell heterostructures nanowire arrays, exhibited great specific capacitance of 1201.67 F g-1 at 1 mA g-1, which is much higher than pristine CuCo2O4 nanowire of 638.89 F g-1 at 1 mA g-1. Simultaneously, it also has a high power density of 5.56 kW kg-1 at an energy density of 73.33 Wh kg-1 and good long-term cycling performance (~84 capacitance retention after 1000 cycles). The improved morphological and structural properties have substantiated the CuCo2O4-Ni(OH)2 core-shell nanowire arrays properties owing to higher surface active area and richer redox activity for boosting the electrochemical properties.

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Pan, H., J. B. Yi, B. H. Liu, S. Thongmee, J. Ding, Yuan Ping Feng i Jian Yi Lin. "Magnetic Properties of Highly-Ordered Ni, Co and Their Alloy Nanowires in AAO Templates". Solid State Phenomena 111 (kwiecień 2006): 123–26. http://dx.doi.org/10.4028/www.scientific.net/ssp.111.123.

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We have fabricated metal/alumina hybrid materials by electrodepositon of metal nanowires into nanopores of anodic aluminum oxide templates. Single crystalline Ni and Co nanowires have been successfully fabricated. Structural characterization (XRD and HRTEM) shows that the single crystalline Ni nanowire has a preferred orientation along (220) direction. The preferred orientation of Co nanowire is along (100). These single crystalline Ni and Co nanowires have exhibited excellent magnetic properties. Their alloy nanowires have exhibited a large shift in hysteresis, probably due to the surface oxidation and exchange bias effect.

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Yu, Yanlong, Jinpeng Li, Jun Wang, Xige Wu, Cuiyan Yu, Tao Xu, Bingdong Chang, Hongyu Sun i Hamidreza Arandiyan. "Orientation Growth and Magnetic Properties of Electrochemical Deposited Nickel Nanowire Arrays". Catalysts 9, nr 2 (3.02.2019): 152. http://dx.doi.org/10.3390/catal9020152.

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Highly ordered ferromagnetic metal nanowire arrays with preferred growth direction show potential applications in electronic and spintronic devices. In this work, by employing a porous anodic aluminum oxide template-assisted electrodeposition method, we successfully prepared Ni nanowire arrays. Importantly, the growth direction of Ni nanowire arrays can be controlled by varying the current densities. The crystalline and growth orientation of Ni nanowire arrays show effects on magnetic properties. Single-crystallinity Ni nanowires with [110] orientation show the best magnetic properties, including coercivity and squareness, along the parallel direction of the nanowire axis. The current preparation strategy can be used to obtain other nanowire arrays (such as metal, alloy, and semiconductor) with controlled growth direction in confined space, and is therefore of broad interest for different applications.

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Podlaha, Elizabeth J., Mohammadsadegh Beheshti, Deyang Li i Sunggook Park. "Fe-Ni-Co Electrodeposited Nanowires Decorated with Au". ECS Meeting Abstracts MA2022-01, nr 24 (7.07.2022): 2487. http://dx.doi.org/10.1149/ma2022-01242487mtgabs.

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Alloy nanowires containing Fe, Ni and Co are of interest as electrode materials in miniaturized devices due to their ability to align them under a magnetic field. In order to improve their resistivity while retaining their magnetic behavior, Fe-Ni-Co nanowires were electrodeposited and decorated with Au; single nanowires were then further characterized (Fig. 1). The nanowires were deposition under a constant applied potential within a nanoscale alumina template, followed by dissolution of the membrane, release of the nanowires, and subsequent treatment in a gold acid electrolyte. Au clusters formed on the Fe-Ni-Co surface through simultaneous displacement and corrosion reactions. The morphology, composition and structure was examined before and after modification, revealing a change in crystallinity and composition that impacted the nanowire’s electrical and magnetic properties. Transferring a single nanowire to a lithographically prepared two-point probe enabled the electrical and magnetic characterization of the Au decorated nanowire. Averaging results of quadruplicate replicates, a low coverage of discontinuous Au clusters on Fe-Ni-Co nanowires significantly decreased the resistivity, not attributed entirely to the lower resistivity of Au, but as a consequence of changes of the Fe-Ni-Co crystallinity. A high coverage of the Fe-Ni-Co by Au had no further benefit, and even increased the resistivity. Since bulk gold is diamagnetic and decoration of Au onto the Fe-Ni-Co nanowires may compromise the overall magnetic property, the magnetoresistance and electron mobility were determined. Both decreased, as expected, with coverage of Au clusters on the nanowires, suggesting that there may be an optimal cluster density for modifying the Fe-Ni-Co nanowires. Figure 1. Electrodeposited nanowires initially amorphous then decorated with Au showing a change in crystallinity and subsequent characterization with a two-point probe. Figure 1

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Shang, Wei Zheng, Wei Guo Zhang i Hong Zhi Wang. "Morphological and Magnetic Properties of Electrodeposited Ni-Ag Alloy Nanowire Arrays in Modified AAO Template". Advanced Materials Research 875-877 (luty 2014): 14–17. http://dx.doi.org/10.4028/www.scientific.net/amr.875-877.14.

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Highly ordered Ni-Ag alloy nanowire arrays have been fabricated successfully by electrodeposition into the pores of anodic aluminum oxide (AAO). This template was prepared with modified two-step anodizing method. The scanning and transmission electron microscopy were utilized to characterize the Ni-Ag alloy nanowire arrays. The results revealed that the nanowire arrays were regularly arranged, about 90nm in diameter and 30µm in length. The nanowires were single crystal and the atomic ratio of Ni and Ag is very close to 79:21. Magnetic hysteresis loop showed that Ni-Ag alloy nanowire arrays embedded in AAO have superparamagnetism, indicating their potential applications in biomedical materials.

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Lin, Hong Yan, Chun Cai Wang, Cui Yan Yu i Tao Xu. "Calculation of Nanowire Growth Activation Energy". Advanced Materials Research 512-515 (maj 2012): 2064–67. http://dx.doi.org/10.4028/www.scientific.net/amr.512-515.2064.

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Two-step preparation technology was used to prepare anodic aluminum oxide (AAO) templates. Then deposit Ni nanowire arrays in nanopores of AAO templates by direct current deposition. TEM spectra of nanowires show that the length of nanowires is uniform and that the shape of nanowires is the same with that of nanopores. Finally, reaction activation energy of Ni growing in nanopores was calculated by experimental data. Results show that Ni growing in the smaller nanopores is much easier than in the bigger nanopores.

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XU, FANG, KAI JIANG, HAOLING SUN, SONG GAO i DONGSHENG XU. "FABRICATION AND MAGNETIC CHARACTERIZATION OF Au/Ni MULTILAYER NANOWIRE ARRAYS". International Journal of Nanoscience 05, nr 02n03 (kwiecień 2006): 183–87. http://dx.doi.org/10.1142/s0219581x06004218.

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Ordered Au/Ni multilayer nanowire arrays have been fabricated into the pores of anodic aluminum oxide (AAO) templates by pulse DC electrodeposition. Structural parameters, such as nanowire length and layer thickness can be controlled by changing the deposition time and the pulse width. The magnetic measurement results indicate that these Au/Ni multilayer nanowire arrays have small coercivity and perpendicular magnetic anisotropy, which the easy axis is parallel to the nanowires. These Au/Ni multilayer structures are expected to be found potential applications in AC inductors or magnetic shielding.

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Brzózka, Agnieszka, Krzysztof Fic, Joanna Bogusz, Anna Brudzisz, Mateusz Marzec, Marta Gajewska i Grzegorz Sulka. "Polypyrrole–Nickel Hydroxide Hybrid Nanowires as Future Materials for Energy Storage". Nanomaterials 9, nr 2 (24.02.2019): 307. http://dx.doi.org/10.3390/nano9020307.

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Hybrid materials play an essential role in the development of the energy storage technologies since a multi-constituent system merges the properties of the individual components. Apart from new features and enhanced performance, such an approach quite often allows the drawbacks of single components to be diminished or reduced entirely. The goal of this paper was to prepare and characterize polymer-metal hydroxide (polypyrrole-nickel hydroxide, PPy-Ni(OH)2) nanowire arrays demonstrating good electrochemical performance. Nanowires were fabricated by potential pulse electrodeposition of pyrrole and nickel hydroxide into nanoporous anodic alumina oxide (AAO) template. The structural features of as-obtained PPy-Ni(OH)2 hybrid nanowires were characterized using FE-SEM and TEM analysis. Their chemical composition was confirmed by energy-dispersive x-ray spectroscopy (EDS). The presence of nickel hydroxide in the synthesized PPy-Ni(OH)2 nanowire array was investigated by X-ray photoelectron spectroscopy (XPS). Both FE-SEM and TEM analyses confirmed that the obtained nanowires were composed of a polymer matrix with nanoparticles dispersed within. EDS and XPS techniques confirmed the presence of PPy-Ni(OH)2 in the nanowire array obtained. Optimal working potential range (i.e., available potential window), charge propagation, and cyclic stability of the electrodes were determined with cyclic voltammetry (CV) at various scan rates. Interestingly, the electrochemical stability window for the aqueous electrolyte at PPy-Ni(OH)2 nanowire array electrode was remarkably wider (ca. 2 times) in comparison with the non-modified PPy electrode. The capacitance values, calculated from cyclic voltammetry performed at 20 mV s−1, were 25 F cm−2 for PPy and 75 F cm−2 for PPy-Ni(OH)2 array electrodes. The cyclic stability of the PPy nanowire array electrode up to 100 cycles showed a capacitance fade of about 13%.

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Liu, Z., W. Li, D. Xu, W. D. Fei i P. P. Jin. "Effects of a magnetic field applied during electroplating on the texture and magnetic properties of Ni nanowire arrays". Powder Diffraction 28, S1 (wrzesień 2013): S12—S16. http://dx.doi.org/10.1017/s0885715612001029.

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Ni nanowire arrays were prepared by electroplating using anodic aluminum oxide templates, and a magnetic field was applied during the electroplating process. The effects of an applied magnetic field on the texture and magnetic properties of the Ni nanowire arrays were studied. The results show that the (110) texture is formed in the nanowires prepared in different magnetic fields. However, the applied magnetic field during electroplating can affect the texture degree, and there exists a suitable magnetic field for small diffusion degree of the (110) texture. On the basis of texture characterization, the effects of applied magnetic field on the magnetic properties of Ni nanowire arrays are discussed.

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GHAHREMANINEZHAD, A., A. DOLATI i M. KAZEMEINI. "GROWTH BEHAVIOR OF THE ELECTRODEPOSITED Co-Ni ALLOY NANOWIRES". International Journal of Modern Physics B 22, nr 18n19 (30.07.2008): 3013–22. http://dx.doi.org/10.1142/s0217979208047870.

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The Co - Ni alloy nanowires were electrodeposited into porous anodic aluminum oxide (AAO) templates. At the first, highly ordered AAO templates were synthesized by two-step anodizing of aluminum to increase pore ordering. Arrays of nanowires with diameter about 30 nm and length about 5000 nm were electrodeposited by alternating current. The composition and structure property of nanowires were investigated by EDX, SEM and TEM techniques. It was found that nanowire composition was related to ions concentration in solution and it was shown that at the optimum potential range of electrodeposition (17-19 V), a change at the potential was shown no strong effect on chemical composition of nanowires. It was observed that nano pores were filled continuously and so nanowires were dense with uniform composition in nanowire length.

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Sidra Khalid i Zaheer Hussain Shah. "The Effect of Magnetic Field on Electro-deposition of Nickel and Cobalt Nanowires". Scientific Inquiry and Review 3, nr 1 (31.01.2019): 14–24. http://dx.doi.org/10.32350/sir.31.02.

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Anodized Aluminum Oxide (AAO) nano-porous template is fabricated and nickel (Ni) nanowires are synthesized in the nano pores of AAO template by AC electro-deposition technique in the presence and absence of magnetic field applying only in a direction parallel to nanowire axis. Cobalt (Co) nanowires are fabricated by applying magnetic field externally both in perpendicular and parallel directions to the axis of nanowires. Magnetic field can bring change in the preferential grain growth of Ni and Co nanowires. Magnetic field applied parallel to nanowire axis increases deposition rate and current density due to magneto hydrodynamic effect, while magnetic field applied in perpendicular to the surface of electrode does not bring significant change in the chemical reaction. Magnetic properties are also affected by applying external magnetic field during deposition. These changes associated with grain growth in the preferred direction of Ni and Co nanowires are discussed in this article.

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Arzuza, Luis C. C., Victor Vega, Victor M. Prida, Karoline O. Moura, Kleber R. Pirota i Fanny Béron. "Single Diameter Modulation Effects on Ni Nanowire Array Magnetization Reversal". Nanomaterials 11, nr 12 (16.12.2021): 3403. http://dx.doi.org/10.3390/nano11123403.

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Geometrically modulated magnetic nanowires are a simple yet efficient strategy to modify the magnetic domain wall propagation since a simple diameter modulation can achieve its pinning during the nanowire magnetization reversal. However, in dense systems of parallel nanowires, the stray fields arising at the diameter interface can interfere with the domain wall propagation in the neighboring nanowires. Therefore, the magnetic behavior of diameter-modulated nanowire arrays can be quite complex and depending on both short and long-range interaction fields, as well as the nanowire geometric dimensions. We applied the first-order reversal curve (FORC) method to bi-segmented Ni nanowire arrays varying the wide segment (45–65 nm diameter, 2.5–10.0 μm length). The FORC results indicate a magnetic behavior modification depending on its length/diameter aspect ratio. The distributions either exhibit a strong extension along the coercivity axis or a main distribution finishing by a fork feature, whereas the extension greatly reduces in amplitude. With the help of micromagnetic simulations, we propose that a low aspect ratio stabilizes pinned domain walls at the diameter modulation during the magnetization reversal. In this case, long-range axial interaction fields nucleate a domain wall at the nanowire extremities, while short-range ones could induce a nucleation at the diameter interface. However, regardless of the wide segment aspect ratio, the magnetization reversal is governed by the local radial stray fields of the modulation near null magnetization. Our findings demonstrate the capacity of distinguishing between complex magnetic behaviors involving convoluted interaction fields.

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Samardak, Alexander S., Alexey V. Ognev, Ekaterina V. Sukovatitsina, Maxim E. Stebliy, Evgeny B. Modin, Liudmila A. Chebotkevich, R. Mahmoodi, M. G. Hosseini, S. M. Peighambari i Farzad Nasirpouri. "Magnetic Behavior of Single Ni Nanowires and its Arrays Embedded in Highly Ordered Nanoporous Alumina Templates". Solid State Phenomena 215 (kwiecień 2014): 298–305. http://dx.doi.org/10.4028/www.scientific.net/ssp.215.298.

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We report on magnetization reversal and geometry dependent magnetic anisotropy of Ni nanowire arrays electrodeposited in nanoporous alumina templates. Using micromagnetic simulation we have found that magnetization reversal mechanism in arrays with different nanowire diameters is curling. This magnetic behavior appears with propagation of the domain wall along a nanowire. The calculations have been proven by the analysis of hysteresis curves. To explain magnetic properties of closely-spaced nanowire arrays we have taken into consideration the magnetostatic interaction between adjacent nanowires and their structural defects, like as boundary grains. The investigated magnetic domain pattern of individual bended nanowires confirms rather complicated magnetization reversal mechanism than either coherent rotation of magnetization or its curling. Competition between the shape and magnetoelastic anisotropies can induce an unusual zigzag-like domain pattern in a single nanowire.

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Tishkevich, Daria, Alla Vorobjova, Dmitry Shimanovich, Egor Kaniukov, Artem Kozlovskiy, Maxim Zdorovets, Denis Vinnik i in. "Magnetic Properties of the Densely Packed Ultra-Long Ni Nanowires Encapsulated in Alumina Membrane". Nanomaterials 11, nr 7 (8.07.2021): 1775. http://dx.doi.org/10.3390/nano11071775.

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High-quality and compact arrays of Ni nanowires with a high ratio (up to 700) were obtained by DC electrochemical deposition into porous anodic alumina membranes with a distance between pores equal to 105 nm. The nanowire arrays were examined using scanning electron microscopy, X-ray diffraction analysis and vibration magnetometry at 300 K and 4.2 K. Microscopic and X-ray diffraction results showed that Ni nanowires are homogeneous, with smooth walls and mostly single-crystalline materials with a 220-oriented growth direction. The magnetic properties of the samples (coercivity and squareness) depend more on the length of the nanowires and the packing factor (the volume fraction of the nanowires in the membrane). It is shown that the dipolar interaction changes the demagnetizing field during a reversal magnetization of the Ni nanowires, and the general effective field of magnetostatic uniaxial shape anisotropy. The effect of magnetostatic interaction between ultra-long nanowires (with an aspect ratio of >500) in samples with a packing factor of ≥37% leads to a reversal magnetization state, in which a “curling”-type model of nanowire behavior is realized.

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Mahajan, Chaitanya, Ahmed Alfadhel, Mark Irving, Bruce Kahn, David Borkholder, Scott Williams i Denis Cormier. "Magnetic Field Patterning of Nickel Nanowire Film Realized by Printed Precursor Inks". Materials 12, nr 6 (20.03.2019): 928. http://dx.doi.org/10.3390/ma12060928.

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This paper demonstrates an easily prepared novel material and approach to producing aligned nickel (Ni) nanowires having unique and customizable structures on a variety of substrates for electronic and magnetic applications. This is a new approach to producing printed metallic Ni structures from precursor materials, and it provides a novel technique for nanowire formation during reduction. This homogeneous solution can be printed in ambient conditions, and it forms aligned elemental Ni nanowires over large areas upon heating in the presence of a magnetic field. The use of templates or subsequent purification are not required. This technique is very flexible, and allows the preparation of unique patterns of nanowires which provides opportunities to produce structures with enhanced anisotropic electrical and magnetic properties. An example of this is the unique fabrication of aligned nanowire grids by overlaying layers of nanowires oriented at different angles with respect to each other. The resistivity of printed and cured films was found to be as low as 560 µΩ∙cm. The saturation magnetization was measured to be 30 emu∙g−1, which is comparable to bulk Ni. Magnetic anisotropy was induced with an axis along the direction of the applied magnetic field, giving soft magnetic properties.

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García-Mochales, P., R. Paredes, S. Peláez i P. A. Serena. "Statistical Molecular Dynamics Study of (111) and (100) Ni Nanocontacts: Evidences of Pentagonal Nanowires". Journal of Nanomaterials 2008 (2008): 1–9. http://dx.doi.org/10.1155/2008/361464.

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We present molecular dynamics calculations on the evolution of Ni nanowires stretched along the (111) and (100) directions, and at two different temperatures. Using a methodology similar to that required to build experimental conductance histograms, we construct minimum crosssection histogramsH(Sm). These histograms are useful to understand the type of favorable atomic configurations appearing during the nanowire breakage. We have found that minimum crosssection histograms obtained for (111) and (100) stretching directions are rather different. When the nanowire is stretched along the (111) direction, monomer and dimer-like configurations appear, giving rise to well-defined peaks inH(Sm). On the contrary, (100) nanowire stretching presents a different breaking pattern. In particular, we have found, with high probability, the formation of staggered pentagonal nanowires, as it has been reported for other metallic species.

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Yao, J. L., G. P. Pan, K. H. Xue, D. Y. Wu, B. Ren, D. M. Sun, J. Tang, X. Xu i Z. Q. Tian. "A complementary study of surface-enhanced Raman scattering and metal nanorod arrays". Pure and Applied Chemistry 72, nr 1-2 (1.01.2000): 221–28. http://dx.doi.org/10.1351/pac200072010221.

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The two-dimensional arrays of various metal nanowires with diameters ranging from 15 to 70 nm have been fabricated by electrodepositing metals of Cu, Ag, Au, Ni, and Co into the nanoholes of the anodic aluminum oxide (AAO) films, followed by partial removal of the film. The strong surface-enhanced Raman scattering (SERS) effects were observed from the metal nanowire arrays including Ni, Co metals that were normally considered to be non-SERS active substrates. It has been shown that metal nanowire arrays can serve as very good SERS active substrates, especially for transition metals. The SERS intensity of the probe molecule adsorbed at the nanowires depends critically on the length of the nanowires explored at the surface. And the band frequency is very sensitive to the diameter, which reflects the change in the electronic property of metal nanowires. Applying this probe molecule strategy, SERS could develop into a diagnostic tool of metal nanowires (nanorods).

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Chu, Yi, Yugui Cui, Shaoyun Huang, Yingjie Xing i Hongqi Xu. "Growth Mechanism of SmB6 Nanowires Synthesized by Chemical Vapor Deposition: Catalyst-Assisted and Catalyst-Free". Nanomaterials 9, nr 8 (24.07.2019): 1062. http://dx.doi.org/10.3390/nano9081062.

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SmB6 nanowires, as a prototype of nanostructured topological Kondo insulator, have shown rich novel physical phenomena relating to their surface. Catalyst-assisted chemical vapor deposition (CVD) is a common approach to prepare SmB6 nanowires and Ni is the most popular catalyst used to initiate the growth of SmB6 nanowires. Here, we study the effect of growth mechanism on the surface of SmB6 nanowires synthesized by CVD. Two types of SmB6 nanowires are obtained when using Ni as the catalyst. In addition to pure SmB6 nanowires without Ni impurity, a small amount of Ni is detected on the surface of some SmB6 nanowires by element analysis with transmission electron microscopy. In order to eliminate the possible distribution of Ni on nanowire surface, we synthesize single crystalline SmB6 nanowires by CVD without using catalyst. The difference between catalyst-assisted and catalyst-free growth mechanism is discussed.

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Caballero-Calero, Olga, Alejandra Ruiz-Clavijo, Cristina V. Manzano, Marisol Martín-González i Gaspar Armelles. "Plasmon Resonances in 1D Nanowire Arrays and 3D Nanowire Networks of Topological Insulators and Metals". Nanomaterials 13, nr 1 (29.12.2022): 154. http://dx.doi.org/10.3390/nano13010154.

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The 1D nanowire arrays and 3D nanowire networks of topological insulators and metals have been fabricated by template-assisted deposition of Bi2Te3 and Ni inside anodic aluminum oxide (AAO) templates, respectively. Despite the different origins of the plasmon capabilities of the two materials, the results indicate that the optical response is determined by plasmon resonances, whose position depends on the nanowire interactions and material properties. Due to the thermoelectric properties of Bi2Te3 nanowires, these plasmon resonances could be used to develop new ways of enhancing thermal gradients and their associated thermoelectric power.

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Marchal, Nicolas, Tristan da Câmara Santa Clara Gomes, Flavio Abreu Araujo i Luc Piraux. "Giant Magnetoresistance and Magneto-Thermopower in 3D Interconnected NixFe1−x/Cu Multilayered Nanowire Networks". Nanomaterials 11, nr 5 (27.04.2021): 1133. http://dx.doi.org/10.3390/nano11051133.

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The versatility of the template-assisted electrodeposition technique to fabricate complex three-dimensional networks made of interconnected nanowires allows one to easily stack ferromagnetic and non-magnetic metallic layers along the nanowire axis. This leads to the fabrication of unique multilayered nanowire network films showing giant magnetoresistance effect in the current-perpendicular-to-plane configuration that can be reliably measured along the macroscopic in-plane direction of the films. Moreover, the system also enables reliable measurements of the analogous magneto-thermoelectric properties of the multilayered nanowire networks. Here, three-dimensional interconnected NixFe1−x/Cu multilayered nanowire networks (with 0.60≤x≤0.97) are fabricated and characterized, leading to large magnetoresistance and magneto-thermopower ratios up to 17% and −25% in Ni80Fe20/Cu, respectively. A strong contrast is observed between the amplitudes of magnetoresistance and magneto-thermoelectric effects depending on the Ni content of the NiFe alloys. In particular, for the highest Ni concentrations, a strong increase in the magneto-thermoelectric effect is observed, more than a factor of 7 larger than the magnetoresistive effect for Ni97Fe3/Cu multilayers. This sharp increase is mainly due to an increase in the spin-dependent Seebeck coefficient from −7 µV/K for the Ni60Fe40/Cu and Ni70Fe30/Cu nanowire arrays to −21 µV/K for the Ni97Fe3/Cu nanowire array. The enhancement of the magneto-thermoelectric effect for multilayered nanowire networks based on dilute Ni alloys is promising for obtaining a flexible magnetic switch for thermoelectric generation for potential applications in heat management or logic devices using thermal energy.

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Shiave, Ali Imran, Ravi Pratap Singh Tomar, Ingrid Padilla Espinosa i Ram Mohan. "Deformation Mechanisms and Dislocations in Nickel–Cobalt Core–Shell Nanowires Under Uniaxial Tensile Loading—A Molecular Dynamics Modeling Analysis". Advanced Science, Engineering and Medicine 11, nr 12 (1.12.2019): 1187–201. http://dx.doi.org/10.1166/asem.2019.2478.

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One-Dimensional nanostructures are of great importance due to their unique electrical, magnetic and mechanical properties. Because of the size constraints, it is impractical to obtain and understand their mechanical properties, deformation behavior and associated mechanisms experimentally, while atomistic computational modeling offers a viable approach. Several studies have focused on pure metallic and compound nanowires; however, investigations and data for core–shell nanowires is still very limited. Present work models and analyzes Nickel–Cobalt (Ni–Co) core–shell nanowire systems under uniaxial tensile loading via molecular dynamics (MD) modeling. Present studies and analysis focus on predictive mechanical properties as well as insights on deformation mechanisms and dislocations during uniaxial tensile loading. Further, pure Ni and Co nanowire systems of similar configurations are modeled, and compared to our findings of core–shell nanowire systems. Results indicate that crystal mismatch in the region of core–shell interface have a significant effect, and plays an important role in the deformation process. Evolution of dislocations during uniaxial tensile loading deformation process, following a dislocation extraction analysis are presented and discussed. Further investigations of the core–shell nanowire structures involved a systematic study on the effect of core size on the predicted mechanical properties. Results indicate that the yield strength and Young's modulus indicated a linear increase for nickel shell–cobalt core systems with a Cobalt core for increasing core sizes, while maintaining nearly similar volume, length, and outer diameter of the core–shell nanowire system. Cobalt shell–nickel core nanowire systems with nickel core however was found not to depict any such definitive characteristics.

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Liu, Wei Long, Yu Lun Hsieh, Shu Huei Hsieh i Wen Jauh Chen. "Effects of Pd and Ni Metals Electrolessly Deposited on Si Nanowires on Properties of Photoelectrochemical Solar Cell". Advanced Materials Research 415-417 (grudzień 2011): 686–89. http://dx.doi.org/10.4028/www.scientific.net/amr.415-417.686.

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A photoelectrochemical solar cell with a structure of modified Si nanowire anocle/K4Fe(CN)6+ K3Fe(CN)6/Pt cathode was prepared and studied. The Si nanowires were first formed by immersing n-Si chip in an etching solution of HF + AgNO3 and Pd and Ni metals were electrolessly deposited on the surface of Si nanowires. The modified anode was characterized by a scanning electron microscope for the surface and cross section view, and by an X-ray diffractometer for the phase and structure. The properties of the photoelectrochemical solar cell were measured under standard AM 1.5 simulated sunlight (100mW/cm2). The results showed that the total photoelectron conversion efficiency of the photoelectrochemical solar cell can be slightly increased when the Si nanowire anode was deposited with Pd metal, and can be greatly increased when deposited with Ni metal.

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García Fernández, Javier, Víctor Vega Martínez, Andy Thomas, Víctor de la Prida Pidal i Kornelius Nielsch. "Two-Step Magnetization Reversal FORC Fingerprint of Coupled Bi-Segmented Ni/Co Magnetic Nanowire Arrays". Nanomaterials 8, nr 7 (19.07.2018): 548. http://dx.doi.org/10.3390/nano8070548.

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First Order Reversal Curve (FORC) analysis has been established as an appropriate method to investigate the magnetic interactions among complex ferromagnetic nanostructures. In this work, the magnetization reversal mechanism of bi-segmented nanowires composed by long Co and Ni segments contacted at one side was investigated, as a model system to identify and understand the FORC fingerprint of a two-step magnetization reversal process. The resulting hysteresis loop of the bi-segmented nanowire array exhibits a completely different magnetic behavior than the one expected for the magnetization reversal process corresponding to each respective Co and Ni nanowire arrays, individually. Based on the FORC analysis, two possible magnetization reversal processes can be distinguished as a consequence of the ferromagnetic coupling at the interface between the Ni and Co segments. Depending on the relative difference between the magnetization switching fields of each segment, the softer magnetic phase induces the switching of the harder one through the injection and propagation of a magnetic domain wall when both switching fields are comparable. On the other hand, if the switching fields values differ enough, the antiparallel magnetic configuration of nanowires is also possible but energetically unfavorable, thus resulting in an unstable magnetic configuration. Making use of the different temperature dependence of the magnetic properties for each nanowire segment with different composition, one of the two types of magnetization reversal is favored, as demonstrated by FORC analyses.

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Lin, Hong Yan, Chun Cai Wang i Bing Sun. "Study on Ni Nanowires Prepared in AAO Template". Advanced Materials Research 557-559 (lipiec 2012): 515–18. http://dx.doi.org/10.4028/www.scientific.net/amr.557-559.515.

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Order nanopore arrays were made by a two-step anodization process. The effect of temperature on the order of nanopore arrays was studied. The result shows that the order is bad when the temperature is too high or too low. Then deposit Ni nanowire arrays in nanopores of AAO templates by direct current deposition. Nanowires deposited in AAO template have uniform length and thickness and the shape of nanowires is the same with that of nanopores. And the growth of the nanowires is from the bottom of the nanopores. Finally, the effect of pore diameter on activation energy of nickel deposited in nanopores was studied. The results show that the smaller the pore diameter the smaller the reaction activation energy, that is more conducive to the reaction.

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Patella, Bernardo, Carmelo Sunseri i Rosalinda Inguanta. "Nanostructured Based Electrochemical Sensors". Journal of Nanoscience and Nanotechnology 19, nr 6 (1.06.2019): 3459–70. http://dx.doi.org/10.1166/jnn.2019.16110.

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In this work, we present some results concerning the electrochemical behavior of nanostructured-based electrochemical sensors. In particular, the attention has been focused on Pd and Cu nanowires for detection of hydrogen peroxide and NiO thin film or Ni@NiO core–shell nanowires for detection of mercury ions. Ordered array of Pd and Cu nanowires was obtained through displacement deposition reaction in a commercial polycarbonate membrane acting as a template. The method leads to stable nanostructured electrodes of Pd and Cu with high surface area. For the detection of mercury ions, we have fabricated a Ni/NiO electrochemical sensor, obtained by mild thermal oxidation of Ni-foil. Some results on Ni@NiO core–shell nanowires were also reported. The effect of oxidation time and temperature was studied in order to compare performances of the Ni@NiO nanowire array with those of NiO thin film. All samples were characterized by XRD, SEM and EDS analysis. Electrochemical tests have been conducted in order to characterize specific electrode performance such as sensibility, selectivity, and accuracy. Highly satisfying results have been obtained.

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Costas, Andreea, Camelia Florica, Elena Matei, Maria Eugenia Toimil-Molares, Ionel Stavarache, Andrei Kuncser, Victor Kuncser i Ionut Enculescu. "Magnetism and magnetoresistance of single Ni–Cu alloy nanowires". Beilstein Journal of Nanotechnology 9 (30.08.2018): 2345–55. http://dx.doi.org/10.3762/bjnano.9.219.

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Arrays of magnetic Ni–Cu alloy nanowires with different compositions were prepared by a template-replication technique using electrochemical deposition into polycarbonate nanoporous membranes. Photolithography was employed for obtaining interdigitated metallic electrode systems of Ti/Au onto SiO2/Si substrates and subsequent electron beam lithography was used for contacting single nanowires in order to investigate their galvano-magnetic properties. The results of the magnetoresistance measurements made on single Ni–Cu alloy nanowires of different compositions have been reported and discussed in detail. A direct methodology for transforming the magnetoresistance data into the corresponding magnetic hysteresis loops was proposed, opening new possibilities for an easy magnetic investigation of single magnetic nanowires in the peculiar cases of Stoner–Wohlfarth-like magnetization reversal mechanisms. The magnetic parameters of single Ni–Cu nanowires of different Ni content have been estimated and discussed by the interpretation of the as derived magnetic hysteresis loops via micromagnetic modeling. It has been theoretically proven that the proposed methodology can be applied over a large range of nanowire diameters if the measurement geometry is suitably chosen.

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Singh, Abhay Pratap, Kevin Roccapriore, Zaina Algarni, Riyadh Salloom, Teresa D. Golden i U. Philipose. "Structure and Electronic Properties of InSb Nanowires Grown in Flexible Polycarbonate Membranes". Nanomaterials 9, nr 9 (5.09.2019): 1260. http://dx.doi.org/10.3390/nano9091260.

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A dense array of vertically aligned indium antimonide (InSb) nanowires with high aspect ratio (diameter 150 nm, length 20 μ m) were grown in the pores of a track-etched polycarbonate membrane via a one-step electrochemical method. There are several reports on InSb nanowire growth in the pores of a mechanically rigid, nano-channel alumina template (NCA), where nanowire growth occurs in the pores of the NCA. This work on InSb nanowire growth in pores of track-etched polycarbonate (PC) membrane sheds light on the various factors that affect nucleation and nanowire growth. The average length and diameter of the as-grown nanowires was about 10 μ m and 150 nm, respectively. Two possible mechanisms accounting for two different morphologies of the as-grown nanowires are proposed. The polycrystallinity observed in some of the nanowires is explained using the 3D ‘nucleation-coalescence’ mechanism. On the other hand, single crystal nanowires with a high density of twin defects and stacking faults grow epitaxially by a two-dimensional (2D) nucleation/growth mechanism. To assess the electrical quality of the nanowires, two- and four-terminal devices were fabricated using a single InSb nanowire contacted by two Ni electrodes. It was found that, at low bias, the ohmic current is controlled by charge diffusion from the bulk contacts. On the other hand, at high bias, the effects of space charge limited current (SCLC) are evident in the current–voltage behavior, characteristic of transport through structures with reduced electrostatic screening. A cross-over from ohmic to SCLC occurs at about 0.14 V, yielding a free carrier concentration of the order of 10 14 cm − 3 .

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Nambo, Apolo, Veerendra Atla, Sivakumar Vasireddy, Vivekanand Kumar, Jacek B. Jasinski, Sreedevi Upadhyayula i Mahendra Sunkara. "Nanowire-Based Materials as Coke-Resistant Catalyst Supports for Dry Methane Reforming". Catalysts 11, nr 2 (28.01.2021): 175. http://dx.doi.org/10.3390/catal11020175.

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In this paper, nanowire-supported catalysts loaded with nickel are shown to be coke resistant compared to nanoparticle-supported catalysts. Specifically, Ni-loaded titania-based nanowire catalysts were tested with the dry methane reforming process in a laboratory-scale continuous packed-bed atmospheric reactor. The CO2 conversion rate stayed above 90% for over 30 h on stream under coke-promoting conditions, such as high flow rates, low temperatures, and a high ratio of CH4 to CO2. The coke (CxHy, x>>y) on the spent catalyst surface for both nanowire- and nanoparticle-supported catalysts was characterized by TGA, temperature-programmed reduction (TPR), and electron microscopy (SEM/TEM/EDS), and it was revealed that the types of carbon species present and their distribution over the morphology-enhanced materials played a major role in the deactivation. The CO2 conversion activity of Ni supported on titania nanoparticles was reduced from ~80% to less than 72% in 30 h due to the formation of a graphitic coke formation. On the other hand, Ni particles supported on nanowires exhibited cube-octahedral morphologies, with a high density of non- (111) surface sites responsible for the increased activity and reduced graphitic coke deposition, giving a sustained and stable catalytic activity during a long time-on-stream experiment.

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Geng, Xiaohua, Eric Navarrete, Wentao Liang i Elizabeth J. Podlaha. "Electrodeposited Fe-Mo-Ni nanowires and Cu-Mo-Fe-Ni alloy nanowire segments". Materials Letters 211 (styczeń 2018): 9–12. http://dx.doi.org/10.1016/j.matlet.2017.09.058.

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WANG, C., Y. H. HE, L. Z. HOU, S. L. WANG, X. L. LIU, Q. ZHANG i C. Q. PENG. "CATALYTIC SYNTHESIS AND GROWTH MECHANISM OF TUNGSTEN NANOWIRE ARRAYS ON SIO2 SUBSTRATES". Nano 08, nr 01 (luty 2013): 1350010. http://dx.doi.org/10.1142/s1793292013500100.

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Single-crystalline W nanowires, with approximately 150 nm in diameter and 15 μm in length, have been successfully synthesized on SiO2 substrates by chemical vapor deposition (CVD) with the assistance of Ni catalysts at 950°C. The catalysts located at the tip of W nanowires were found to be Ni4W in a solid state, rather than a liquid state. The low-temperature growth of W nanowires using the solid catalysts can be generally accessible, provided that the appropriate combination of solid catalysts and nanowires are thermodynamically available, thus suggesting the implication for the potentially large-area integrated growth on various substrates. The growth direction of the generated [100]-oriented W nanowires was presumed to be determined by the orientation relationship between the solid Ni catalyst particle and the W precipitate. A possible catalytic growth model was proposed according to the analysis of the experimental results. The orientation relationship between the solid catalyst particle and the corresponding nanowire was expected to be also valid for some other nanowires induced by solid catalyst.

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36

Hong, Xue Bin. "Steam Reforming of Ethanol by a Nickel Nanowire Catalyst". Applied Mechanics and Materials 651-653 (wrzesień 2014): 92–102. http://dx.doi.org/10.4028/www.scientific.net/amm.651-653.92.

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A nickel nanowire catalyst was prepared by a hard templating method, and characterized by transmission electron microscopy (TEM), N2 physical adsorption, X-ray photoelectron spectrometry (XPS), X-ray diffraction (XRD) and H2 temperature-programmed reduction (H2-TPR). The catalytic properties of the nanowire catalyst in the ethanol steam reforming were compared with a metallic Ni catalyst which was prepared with nickel sponge. The characterization results showed that the nickel nanowire catalyst had high specific surface area and there was more NiO phase in the nickel nanowire catalyst than in the metallic Ni catalyst. The reaction results showed that the nickel nanowire catalyst had higher ethanol conversion and hydrogen yield than the metallic Ni catalyst.

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Wu, Yongheng, Mingji Li, Cuiping Li, Xiaoguo Wu, Baohe Yang i Hongji Li. "Fast growth of amorphous Si nanowires by direct current arc plasma jet chemical vapor deposition". Functional Materials Letters 10, nr 03 (10.01.2017): 1750021. http://dx.doi.org/10.1142/s1793604717500217.

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Silicon (Si) nanowires were synthesized by direct current arc plasma jet chemical vapor deposition. It was found that growth temperature and growth time played important roles in the morphologies of the Si nanowires. The possible formation mechanism of Si nanowire was also proposed according to the corresponding results. In addition, the Ni particles are dispersed on the Si substrate with the help of alkaline etching, which enables the lateral growth of Si nanowires on a Si substrate. This offers a simple and practical way of synthesizing and positioning the Si nanowires on a substrate.

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Guo, L., R. N. Singh i H. J. Kleebe. "Growth of Boron-Rich Nanowires by Chemical Vapor Deposition (CVD)". Journal of Nanomaterials 2006 (2006): 1–6. http://dx.doi.org/10.1155/jnm/2006/58237.

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B-rich nanowires are grown on Ni coated oxidized Si(111) substrate using diborane as the gas precursor in a CVD process at 20 torr and900C∘. These nanowires have diameters around 20–100 nanometers and lengths up to microns. IcosahedronB12is shown to be the basic building unit forming the amorphous B-rich nanowires as characterized by EDAX, XRD, XPS, and Raman spectroscopies. The gas chemistry at low [B2H6]/ [N2] ratio is monitored by the in situ mass spectroscopy, which identifiedN2as an inert carrier gas leading to formation of the B-rich compounds. A nucleation controlled growth mechanism is proposed to explain the rugged nanowire growth of boron. The role of the Ni catalyst in the synthesis of the B-rich nanostructures is also discussed.

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Wang, Xuan Liang, En Mei Jin, Jiasheng Chen, Parthasarathi Bandyopadhyay, Bo Jin i Sang Mun Jeong. "Facile In Situ Synthesis of Co(OH)2–Ni3S2 Nanowires on Ni Foam for Use in High-Energy-Density Supercapacitors". Nanomaterials 12, nr 1 (23.12.2021): 34. http://dx.doi.org/10.3390/nano12010034.

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Ni3S2 nanowires were synthesized in situ using a one-pot hydrothermal reaction on Ni foam (NF) for use in supercapacitors as a positive electrode, and various contents (0.3−0.6 mmol) of Co(OH)2 shells were coated onto the surfaces of the Ni3S2 nanowire cores to improve the electrochemical properties. The Ni3S2 nanowires were uniformly formed on the smooth NF surface, and the Co(OH)2 shell was formed on the Ni3S2 nanowire surface. By direct NF participation as a reactant without adding any other Ni source, Ni3S2 was formed more closely to the NF surface, and the Co(OH)2 shell suppressed the loss of active material during charging–discharging, yielding excellent electrochemical properties. The Co(OH)2–Ni3S2/Ni electrode produced using 0.5 mmol Co(OH)2 (Co0.5–Ni3S2/Ni) exhibited a high specific capacitance of 1837 F g−1 (16.07 F cm−2) at a current density of 5 mA cm−2, and maintained a capacitance of 583 F g−1 (16.07 F cm−2) at a much higher current density of 50 mA cm−2. An asymmetric supercapacitor (ASC) with Co(OH)2–Ni3S2 and active carbon displayed a high-power density of 1036 kW kg−1 at an energy density of 43 W h kg−1 with good cycling stability, indicating its suitability for use in energy storage applications. Thus, the newly developed core–shell structure, Co(OH)2–Ni3S2, was shown to be efficient at improving the electrochemical performance.

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KHALID, SIDRA, REHANA SHARIF i ZAHEER HUSSAIN SHAH. "TAILORING OF MAGNETIC EASY AXIS OF NICKEL NANOWIRES BY VARYING DIAMETER". Surface Review and Letters 23, nr 04 (15.06.2016): 1650024. http://dx.doi.org/10.1142/s0218625x16500244.

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Anodized aluminum oxide (AAO) templates with an average diameter of [Formula: see text][Formula: see text]nm and [Formula: see text][Formula: see text]nm are synthesized by two-step anodization. Nickel nanowires are fabricated by AC electro deposition with less microstructure defects at low voltage in AAO templates. Magnetic properties of compact nickel (Ni) nanowires show that easy axis is parallel to nanowire axis for diameter [Formula: see text][Formula: see text]nm while by varying diameter from [Formula: see text][Formula: see text]nm to [Formula: see text][Formula: see text]nm, easy axis shifts to perpendicular direction of nanowire axis. This shifting of magnetic easy axis from parallel to perpendicular direction is mainly due to shape anisotropy and interactive fields between the wires. The competition between shape anisotropy (due to individual wire) and interactive fields by varying diameter of nanowires could result in tailoring of the direction of magnetic easy axis of nanowires.

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Lee, Hung-Bin, Jiun-Chen Tsau i Chun-Ying Lee. "HER Catalytic Activity of Electrodeposited Ni-P Nanowires under the Influence of Magnetic Field". Journal of Nanomaterials 2013 (2013): 1–9. http://dx.doi.org/10.1155/2013/191728.

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Nickel alloy electrodes both in plane and nanowire morphologies were fabricated by electrodeposition in sulfamate bath. With the increasing concentration of phosphorous acid in the electrolyte, the P content in the deposition increased accordingly. In the meantime, the grain refined and even became amorphous in microstructure as the P content was raised. For the nanowire electrode, vibrating sample magnetometer (VSM) measurement showed that its coercivity was anisotropic and decreased with P-content. In addition, the easy axis for magnetization of the electrode was parallel to the axial direction of nanowire. The electrocatalytic activity measurement of the electrode in 0.5 M H2SO4electrolyte showed that the nanowire electrode had higher activity than the plane one, and the alloying of P in Ni electrode raised its hydrogen evolution reaction (HER) performance. The enhanced performance of nanowire electrode was attributed to the smaller and more uniform hydrogen bubbles generated in HER reaction. Finally, the applied magnetic field (3.2 T) improved significantly the HER activity of Ni but not Ni-P electrode. By using nanowire morphology and applying magnetic field, the current density at −0.75 V HER stability test of the Ni electrode increased fourfold more than its plane counterpart.

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Hung, Sheng-Chun, Chia-Chi Chen, Yu-Cheng Lin i Chung-Wei Lin. "(Invited) Non-Enzymatic Glucose Sensor Fabricated By Ni-Nanowires Decorated Graphene Gated FETs". ECS Transactions 111, nr 3 (19.05.2023): 55–61. http://dx.doi.org/10.1149/11103.0055ecst.

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In this study, an innovative non-invasive glucose sensor made of nickel nanowire-decorated graphene-gated field-effect transistors is demonstrated. Due to the redox reaction between nickel nanowires and glucose molecules, electron exchange occurs when Ni(III) reacts with glucose to form Ni(II) and gluconolactone. Changes in electron concentration are amplified by transistors at the bottom, improving detection sensitivity. In this study, the electrical properties of glucose sensor fabricated from nickel nanowire/graphene/gold surfaces was studied. Since the CVD-grown graphene film has excellent electrical conductivity, the electrons generated by the redox reaction can be quickly and evenly dispersed. The results show that the glucose sensor with graphene film has good current stability, low detection limit and good linear relationship between current and concentration. The demonstrated nickel wire-decorated graphene-gated FET biosensor can be used for the quantification of glucose with a linear range of 10-50 mM and a detection limit of 51nM.

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Hong, Xue Bin, Bing Bing Li i Cong Zhang. "Zirconia Promoted Nickel Nanowire Catalyst for the Partial Oxidation of Methane to Synthesis Gas". Advanced Materials Research 791-793 (wrzesień 2013): 106–11. http://dx.doi.org/10.4028/www.scientific.net/amr.791-793.106.

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A zirconia promoted nickel nanowire catalyst was prepared by a hard templating method, and characterized by transmission electron microscopy (TEM) and N2 physical adsorption. The catalytic properties of the zirconia promoted nanowire catalyst in the partial oxidation of methane to syngas were compared with a metallic Ni catalyst which was prepared with nickel sponge. The characterization results showed that the zirconia promoted nickel nanowire catalyst had high specific surface area and there was more NiO phase in the nickel nanowire catalyst than in the metallic Ni catalyst. The reaction results showed that the zirconia promoted nickel nanowire catalyst had high CH4 conversion and selectivities to H2 and CO.

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44

Zhang, Yaya, Wen Xu, Shaohui Xu, Guangtao Fei, Yiming Xiao i Jiaguang Hu. "Optical properties of Ni and Cu nanowire arrays and Ni/Cu superlattice nanowire arrays". Nanoscale Research Letters 7, nr 1 (2012): 569. http://dx.doi.org/10.1186/1556-276x-7-569.

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Vidu, Predescu, Matei, Berbecaru, Pantilimon, Dragan i Predescu. "Template-Assisted Co-Ni Nanowire Arrays". Nanomaterials 9, nr 10 (11.10.2019): 1446. http://dx.doi.org/10.3390/nano9101446.

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A comparison was performed between Co-Ni thin films and template-assisted nanowires arrays obtained by electrochemical co-deposition. To reduce the effects of anomalous deposition and increase the Ni content in the deposit, an electrolyte with three times more Ni than Co in atomic ratio was chosen. Electrochemical deposition was performed at constant potentials chosen in the range from E = −0.8 to −1.2 V vs. Ag/AgCl. Cyclic voltammetry, chronoamperometry, and charge stripping techniques were used to characterize and compare the electrochemical behavior of Co-Ni films and nanowires. Morphological and compositional characterization was performed by scanning electron microscopy (SEM/EDAX) to assess the influence of the deposition potential on the growth of film and nanowires. A comprehensive analysis of the deposit growth rates for thin films and nanowires is presented taking into consideration the hydrogen evolution and anomalous deposition. The comparative study of the composition of film and nanowires obtained at different deposition potentials has shown that deposition of nanowires with a film-like composition takes place at more positive potential than thin film.

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Yan, Ai-Lan, Wei-Dong Wang, Wen-Qiang Chen, Xin-Chang Wang, Fu Liu i Ji-Peng Cheng. "The Synthesis of NiCo2O4–MnO2 Core–Shell Nanowires by Electrodeposition and Its Supercapacitive Properties". Nanomaterials 9, nr 10 (1.10.2019): 1398. http://dx.doi.org/10.3390/nano9101398.

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Hierarchical composite films grown on current collectors are popularly reported to be directly used as electrodes for supercapacitors. Highly dense and conductive NiCo2O4 nanowires are ideal backbones to support guest materials. In this work, low crystalline MnO2 nanoflakes are electrodeposited onto the surface of NiCo2O4 nanowire films pre-coated on nickel foam. Each building block in the composite films is a NiCo2O4–MnO2 core–shell nanowire on conductive nickel foam. Due to the co-presence of MnO2 and NiCo2O4, the MnO2@NiCo2O4@Ni electrode exhibits higher specific capacitance and larger working voltage than the NiCo2O4@Ni electrode. It can have a high specific capacitance of 1186 F·g−1 at 1 A·g−1. When the core–shell NiCo2O4–MnO2 composite and activated carbon are assembled as a hybrid capacitor, it has the highest energy density of 29.6 Wh·kg−1 at a power density of 425 W·kg−1 with an operating voltage of 1.7 V. This work shows readers an easy method to synthesize composite films for energy storage.

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Thiem, Luu Van, Le Tuan Tu i Pham Duc Thang. "Influence of Bath Composition on the Electrodeposited \(\text{Co-Ni-P}\) Nanowires". Communications in Physics 24, nr 3S1 (10.11.2014): 90–94. http://dx.doi.org/10.15625/0868-3166/24/3s1/5232.

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CoNiP nanowire arrays were fabricated by electrodeposition method into polycarbonate (PC) templates at different pH values. It is obvious that the crystal structure of the CoNiP nanowires depends on the pH values of electrolyte. The XRD results show that crystal structure of the CoNiP nanowires is hcp structure and the intensity of the hcp (002) increased enhances as solution pH =5. Magnetic measurements indicate a dependence of the squareness and the coercivity of the magnetization hysteresis loop on pH values with a maximum coercivity of 1425 Oe. The morphological properties of CoNiP nanowires were studied by transmission electron microscopy (TEM). The chemical composition was determined by examination of the energy dispersive X-ray (EDS) spectra and the magnetic properties were measured by vibrating sample magnetometry (VSM).

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Abd Ghafar, Nurhanis Sofiah, Santhi Ulakanathan, Mahendran Samykano, Kumaran Kadirgama, Hussein A. Mohammed i Wai Keng Ngui. "Template Synthesis of Ni Nanowires: Characterization and Modelling". Journal of Advanced Research in Fluid Mechanics and Thermal Sciences 77, nr 2 (14.11.2020): 76–90. http://dx.doi.org/10.37934/arfmts.77.2.7690.

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Template-assisted electrochemical deposition is a straight forward approach for the synthesis of 1D nanostructures (e.g., nanowire, nanorod, and nanobelt) with controllable morphology. This approach is suitable for mass production as it works at ambient pressure and temperature with the properties of synthesized 1D nanostructures being influenced by synthesis conditions during the electrochemical deposition process. This work aims to investigate the influence of stabilizing agent concentration and heating temperature towards the physical behavior of Nickel (Ni) nanowires synthesized via a template-assisted electrochemical deposition approach. In this research, the electrolyte bath was prepared in three different concentrations of the stabilizing agent (6 g/L, 40 g/L and 70 g/L), and the deposition bath temperature used was 30°C, 70°C, and 110°C respectively. The elemental composition was determined using Energy Dispersive X-ray (EDX) analysis to investigate the percentage of pure Ni element in the synthesized nanowires. The diameter, surface texture, and growth length of the synthesized Ni nanowires were characterized using Field Emission Scanning Electron Microscope (FESEM). X-ray diffractions (XRD) was used for crystal size and crystal orientation analysis. Additionally, the mechanical properties of Ni nanowires were extracted via molecular dynamic simulation. Growth length of Ni nanowires found to be significantly improved as the heating temperature increased, but it decreased when stabilizer agent concentration is high. The diffraction patterns for all synthesis conditions exhibited the synthesis Ni nanowires are polycrystalline as the crystalline planes with Miller indices of 111, 200, and 220. All the investigated nanowires showed ductile failure behavior, a typical behavior at larger length scales of Ni.

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García, Javier, Ruth Gutiérrez, Ana S. González, Ana I. Jiménez-Ramirez, Yolanda Álvarez, Víctor Vega, Heiko Reith i in. "Exchange Bias Effect of Ni@(NiO,Ni(OH)2) Core/Shell Nanowires Synthesized by Electrochemical Deposition in Nanoporous Alumina Membranes". International Journal of Molecular Sciences 24, nr 8 (11.04.2023): 7036. http://dx.doi.org/10.3390/ijms24087036.

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Tuning and controlling the magnetic properties of nanomaterials is crucial to implement new and reliable technologies based on magnetic hyperthermia, spintronics, or sensors, among others. Despite variations in the alloy composition as well as the realization of several post material fabrication treatments, magnetic heterostructures as ferromagnetic/antiferromagnetic coupled layers have been widely used to modify or generate unidirectional magnetic anisotropies. In this work, a pure electrochemical approach has been used to fabricate core (FM)/shell (AFM) Ni@(NiO,Ni(OH)2) nanowire arrays, avoiding thermal oxidation procedures incompatible with integrative semiconductor technologies. Besides the morphology and compositional characterization of these core/shell nanowires, their peculiar magnetic properties have been studied by temperature dependent (isothermal) hysteresis loops, thermomagnetic curves and FORC analysis, revealing the existence of two different effects derived from Ni nanowires’ surface oxidation over the magnetic performance of the array. First of all, a magnetic hardening of the nanowires along the parallel direction of the applied magnetic field with respect their long axis (easy magnetization axis) has been found. The increase in coercivity, as an effect of surface oxidation, has been observed to be around 17% (43%) at 300 K (50 K). On the other hand, an increasing exchange bias effect on decreasing temperature has been encountered when field cooling (3T) the oxidized Ni@(NiO,Ni(OH)2) nanowires below 100 K along their parallel lengths.

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SONG, YOUNGSIK, i JAEWU CHOI. "ROLE OF TITANIUM CAPPING LAYER IN AMORPHOUS SILICON NANOWIRE GROWTH BY SOLID-STATE REACTION". Nano 01, nr 02 (wrzesień 2006): 159–65. http://dx.doi.org/10.1142/s179329200600015x.

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Role of titanium capping layer in synthesis of amorphous silicon nanowires by solid-state reaction was studied by Raman spectroscopy, energy dispersive spectroscopy, scanning electron microscopy and transmission electron microscopy. Silicon nanowires were not grown from 20nm thick nickel film on silicon (100) but grown from 20nm thick nickel film on silicon (100) with 100 nm thick titanium capping layer. The study shows that titanium capping layer plays an important role in formation of Ni–Ti–Si ternary alloy, which acts as a nucleation seed and a promoter for silicon nanowire growth.

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