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Статті в журналах з теми "Ag(/Au)@Pt(/Pd) core-shell nanoparticle"

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Автор: Grafiati
Опубліковано: 14 жовтня 2022

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1

Miyakawa, Masato, Norihito Hiyoshi, Masateru Nishioka, Hidekazu Koda, Koichi Sato, Akira Miyazawa, and Toshishige M. Suzuki. "Continuous syntheses of Pd@Pt and Cu@Ag core–shell nanoparticles using microwave-assisted core particle formation coupled with galvanic metal displacement." Nanoscale 6, no. 15 (2014): 8720–25. http://dx.doi.org/10.1039/c4nr00118d.

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2

Salem, Mohamed A., Eman A. Bakr, and Heba G. El-Attar. "Pt@Ag and Pd@Ag core/shell nanoparticles for catalytic degradation of Congo red in aqueous solution." Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy 188 (January 2018): 155–63. http://dx.doi.org/10.1016/j.saa.2017.07.002.

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3

Коротун, А. В., та В. В. Погосов. "К расчету оптических характеристик и размерных сдвигов поверхностных плазмонов сферических биметаллических наночастиц". Физика твердого тела 63, № 1 (2021): 120. http://dx.doi.org/10.21883/ftt.2021.01.50409.178.

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Formulas are obtained for the effective relaxation time when the electron mean free path is less or comparable with the characteristic dimensions of the metallic regions. The frequency dispersion of the optical characteristics of spherical bimetallic particles near plasma resonances is calculated in the absence of quantum-size effects. Maintaining the style of the generally accepted description of monometallic particles based on the theories of Drude and Mie, the frequency dependence of the electric dipole polarizability of a two-layer metal nanosphere is analyzed. The appearance of two maxima of polarizability is a consequence of the difference between the metals of the core and the shell. The calculations were performed for Au @ Ag, Ag @ Au, Au @ Pt, Pt @ Au, and Pt @ Pd particles immersed in Teflon. The possibility of controlling the optical characteristics of bimetallic particles by changing their composition and volumetric content of metals has been demonstrated. The calculations of the absorption and scattering cross sections, as well as the optical radiation efficiency of particles in a wide spectral range, have been performed. The possible temperature of bimetallic particles upon absorption of an electromagnetic wave (for the purposes of photothermal therapy of malignant tumors) has been estimated. Key words: bimetallic nanoparticle, surface plasmon, polarizability, absorption cross section, scattering cross section, relaxation time.
4

Li, Yuan, Weihong Qi, Baiyun Huang, Wenhai Ji, and Mingpu Wang. "Size- and Composition-Dependent Structural Stability of Core–Shell and Alloy Pd–Pt and Au–Ag Nanoparticles." Journal of Physical Chemistry C 117, no. 29 (July 16, 2013): 15394–401. http://dx.doi.org/10.1021/jp404422y.

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5

Chatterjee, Aniruddha, and Dharmesh Hansora. "Graphene Based Functional Hybrid Nanostructures: Preparation, Properties and Applications." Materials Science Forum 842 (February 2016): 53–75. http://dx.doi.org/10.4028/www.scientific.net/msf.842.53.

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The intent of this chapter is to provide a basic overview of recent advances in graphene based hybrid nanostructures including their preparation, properties and potential applications in various field. The development of graphene based functional materials, has shown their tremendous interest in areas of science, engineering and technology. These materials include graphene supported inorganic nanomaterials and films, graphene-metal decorated nanostructures, Core/shell structures of nanocarbon-graphene and graphene doped polymer hybrid nanocomposites etc. They have been prepared by various methods like chemical vapor deposition of hydrocarbon on metal surface, liquid phase exfoliation of graphite, chemical reduction of GO, silver mirror reaction, catalysis, in-situ hydroxylation and sono sol-gel route, respectively. The attractive properties of graphene and their derivatives filled with metal nanoparticles (e.g. Au, Ag, Pd, Pt, Ni, and Cu) have made them ideal templates. Graphene and their derivatives have also been decorated with various semiconductor nanomaterials (e.g. metal oxides and dioxides, metal sulfides). These metal decorated graphene nanostructures can be useful as functional hybrid nanomaterials in electronics, optics, and energy based products like solar cells, fuel cells, Li-ion batteries and supercapacitors, ion exchange and molecular adsorption.
6

Li, Shan Shan, Ying Nan Dong, You Ning Xu, Bing Li, and Mei Ling Tang. "Photochemical Synthesis of Pd Core @ Pt Shell Nanoparticles in Polyethylene Glycol (PEG) Solution System." Applied Mechanics and Materials 535 (February 2014): 753–57. http://dx.doi.org/10.4028/www.scientific.net/amm.535.753.

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In the sodium citrate solution systems containing double metal ions with different Pd-Pt molar ratios and single Pt (IV) ions, Pd Core @ Pt Shell nanoparticles were synthesized by the photochemical coreduction and Pd seed method, respectively. By means of characterization of TEM, the change regularity of the composite nanoparticle sizes was studied in both preparation methods. The surface chemical state of the composite nanoparticles and their structure were analyzed by X-ray photoelectron spectroscopy (XPS), confirming that Pd @ Pt nanoparticles formed are core-shell structure. Keywords: Pd Core @ Pt Shell; Photochemical; Simultaneous reduction; Seeding growth
7

Miyakawa, Masato, Norihito Hiyoshi, Hidekazu Koda, Kenichi Watanabe, Hideki Kunigami, Hiroshi Kunigami, Akira Miyazawa, and Masateru Nishioka. "Continuous syntheses of carbon-supported Pd and Pd@Pt core–shell nanoparticles using a flow-type single-mode microwave reactor." RSC Advances 10, no. 11 (2020): 6571–75. http://dx.doi.org/10.1039/c9ra10140c.

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8

Nishimura, Y. F., T. Hamaguchi, S. Yamaguchi, H. Takagi, K. Dohmae, T. Nonaka, and Y. Nagai. "Study of coordination environments around Pd and Pt in a Pd-core Pt-shell nanoparticle during heating." Journal of Physics: Conference Series 712 (May 2016): 012067. http://dx.doi.org/10.1088/1742-6596/712/1/012067.

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9

Arroyo-Ramírez, Lisandra, Chen Chen, Matteo Cargnello, Christopher B. Murray, Paolo Fornasiero, and Raymond J. Gorte. "Supported platinum–zinc oxide core–shell nanoparticle catalysts for methanol steam reforming." J. Mater. Chem. A 2, no. 45 (2014): 19509–14. http://dx.doi.org/10.1039/c4ta04790g.

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10

Su, Li, Yarong Cheng, Jiaci Shi, Xuefeng Wang, Pengcheng Xu, Ying Chen, Yuan Zhang, Sen Zhang, and Li Xinxin. "Electrochemical Sensor with Bimetallic Pt–Ag Nanoparticle as Catalyst for the Measurement of Dissolved Formaldehyde." Journal of The Electrochemical Society 169, no. 4 (April 1, 2022): 047507. http://dx.doi.org/10.1149/1945-7111/ac61bd.

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Formaldehyde (FA) in food is harmful to human health, an effective detecting tool is highly desired especially for the on-site test. Herein, an amperometric aqueous FA sensor was fabricated by applying Pt–Ag core-shell nanoparticles as electrocatalyst. The well-characterized core-shell nanostructure exhibits high electro-catalytical activity for the detection of FA molecules in solution due to the synergistic effect of bimetallic Pt–Ag nanostructure. The proposed sensor exhibits high FA sensing performance, with a linear detection range from 1 to 100 μM and a limit of detection (LOD) down to 1.0 μM on the optimized conditions. Interferents coexisting in food samples were efficiently minimized by good selectivity. The Pt–Ag nanostructure-based FA sensor keeps catalytical activity for at least 30 d and shows good batch reproducibility. The proposed sensor was applied for the detection of FA in the food samples and satisfactory results were obtained, showing potential for the fast, simple, disposable, and cost-effective FA detecting method for food safety.
11

TOSHIMA, NAOKI, YUKIHIDE SHIRAISHI, TORU MATSUSHITA, HISAYOSHI MUKAI, and KAZUTAKA HIRAKAWA. "SELF-ORGANIZATION OF METAL NANOPARTICLES AND ITS APPLICATION TO SYNTHESES OF Pd/Ag/Rh TRIMETALLIC NANOPARTICLE CATALYSTS WITH TRIPLE CORE/SHELL STRUCTURES." International Journal of Nanoscience 01, no. 05n06 (October 2002): 397–401. http://dx.doi.org/10.1142/s0219581x02000395.

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Self-organization of metal nanoparticles, which is observed by mixing Ag nanoparticles and precious metal nanoparticles, is applied to the synthesis of Pd/Ag/Rh trimetallic nanoparticles having a Pd-core/Ag-interlayer/Rh-shell structure. These trimetallic nanoparticles work as a more active catalyst for hydrogenation of olefin than the corresponding monometallic and bimetallic nanoparticles.
12

Nan, Haoxiong, Xinlong Tian, Lijun Yang, Ting Shu, Huiyu Song, and Shijun Liao. "A Platinum Monolayer Core-Shell Catalyst with a Ternary Alloy Nanoparticle Core and Enhanced Stability for the Oxygen Reduction Reaction." Journal of Nanomaterials 2015 (2015): 1–11. http://dx.doi.org/10.1155/2015/715474.

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We synthesize a platinum monolayer core-shell catalyst with a ternary alloy nanoparticle core of Pd, Ir, and Ni. A Pt monolayer is deposited on carbon-supported PdIrNi nanoparticles using an underpotential deposition method, in which a copper monolayer is applied to the ternary nanoparticles; this is followed by the galvanic displacement of Cu with Pt to generate a Pt monolayer on the surface of the core. The core-shell Pd1Ir1Ni2@Pt/C catalyst exhibits excellent oxygen reduction reaction activity, yielding a mass activity significantly higher than that of Pt monolayer catalysts containing PdIr or PdNi nanoparticles as cores and four times higher than that of a commercial Pt/C electrocatalyst. In 0.1 M HClO4, the half-wave potential reaches 0.91 V, about 30 mV higher than that of Pt/C. We verify the structure and composition of the carbon-supported PdIrNi nanoparticles using X-ray powder diffraction, X-ray photoelectron spectroscopy, thermogravimetry, transmission electron microscopy, and energy dispersive X-ray spectrometry, and we perform a stability test that confirms the excellent stability of our core-shell catalyst. We suggest that the porous structure resulting from the dissolution of Ni in the alloy nanoparticles may be the main reason for the catalyst’s enhanced performance.
13

Dutta, Soumen, Chaiti Ray, Anup Kumar Sasmal, Yuichi Negishi, and Tarasankar Pal. "Fabrication of dog-bone shaped Au NRcore–Pt/Pdshell trimetallic nanoparticle-decorated reduced graphene oxide nanosheets for excellent electrocatalysis." Journal of Materials Chemistry A 4, no. 10 (2016): 3765–76. http://dx.doi.org/10.1039/c6ta00379f.

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Dog-bone shaped Au NRcore–Pt/Pdshell decorated reduced graphene oxide nanocomposites (GMTs) exhibit outstanding electrocatalytic activity and durability towards ethanol oxidation reaction.
14

Vlaic, Sergio, Dimitris Mousadakos, Safia Ouazi, Stefano Rusponi, and Harald Brune. "Increasing Magnetic Anisotropy in Bimetallic Nanoislands Grown on fcc(111) Metal Surfaces." Nanomaterials 12, no. 3 (February 2, 2022): 518. http://dx.doi.org/10.3390/nano12030518.

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The magnetic properties and the atomic scale morphology of bimetallic two-dimensional nanoislands, epitaxially grown on fcc(111) metal surfaces, have been studied by means of Magneto-Optical Kerr Effect and Scanning Tunneling Microscopy. We investigate the effect on blocking temperature of one-dimensional interlines appearing in core-shell structures, of two-dimensional interfaces created by capping, and of random alloying. The islands are grown on Pt(111) and contain a Co-core, surrounded by Ag, Rh, and Pd shells, or capped by Pd. The largest effect is obtained by Pd capping, increasing the blocking temperature by a factor of three compared to pure Co islands. In addition, for Co-core Fe-shell and Co-core FexCo1−x-shell islands, self-assembled into well ordered superlattices on Au(11,12,12) vicinal surfaces, we find a strong enhancement of the blocking temperature compared to pure Co islands of the same size. These ultra-high-density (15 Tdots/in2) superlattices of CoFe nanodots, only 500 atoms in size, have blocking temperature exceeding 100 K. Our findings open new possibilities to tailor the magnetic properties of nanoislands.
15

Kim, Young Jun, Hyein Lee, Hee-Suk Chung, Youngku Sohn, and Choong Kyun Rhee. "PT-BI Co-Deposit Shell on AU Nanoparticle Core: High Performance and Long Durability for Formic Acid Oxidation." Catalysts 11, no. 9 (August 30, 2021): 1049. http://dx.doi.org/10.3390/catal11091049.

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This work presents the catalysts of Pt-Bi shells on Au nanoparticle cores and Pt overlayers on the Pt-Bi shells toward formic acid oxidation (FAO). Pt and Bi were co-deposited on Au nanoparticles (Au NP) via the irreversible adsorption method using a mixed precursor solution of Pt and Bi ions, and the amount of the co-deposits was controlled with the repetition of the deposition cycle. Rinsing of the co-adsorbed ionic layers of Pt and Bi with a H2SO4 solution selectively removed the Bi ions to leave Pt-rich and Bi-lean (<0.4 atomic %) co-deposits on Au NP (Pt-Bi/Au NP), conceptually similar to de-alloying. Additional Pt was deposited over Pt-Bi/Au NPs (Pt/Pt-Bi/Au NPs) to manipulate further the physicochemical properties of Pt-Bi/Au NPs. Transmission electron microscopy revealed the core–shell structures of Pt-Bi/Au NPs and Pt/Pt-Bi/Au NPs, whose shell thickness ranged from roughly four to six atomic layers. Moreover, the low crystallinity of the Pt-containing shells was confirmed with X-ray diffraction. Electrochemical studies showed that the surfaces of Pt-Bi/Au NPs were characterized by low hydrogen adsorption abilities, which increased after the deposition of additional Pt. Durability tests were carried out with 1000 voltammetric cycles between −0.26 and 0.4 V (versus Ag/AgCl) in a solution of 1.0 M HCOOH + 0.1 M H2SO4. The initial averaged FAO performance on Pt-Bi/Au NPs and Pt/Pt-Bi/Au NPs (0.11 ± 0.01 A/mg, normalized to the catalyst weight) was higher than that of a commercial Pt nanoparticle catalyst (Pt NP, 0.023 A/mg) by a factor of ~5, mainly due to enhancement of dehydrogenation and suppression of dehydration. The catalytic activity of Pt/Pt-Bi/Au NP (0.04 ± 0.01 A/mg) in the 1000th cycle was greater than that of Pt-Bi/Au NP (0.026 ± 0.003 A/mg) and that of Pt NP (0.006 A/mg). The reason for the higher durability was suggested to be the low mobility of surface Pt atoms on the investigated catalysts.
16

Garip, Ali Kemal. "A molecular dynamics study: Structures and thermal stability of PdmPt(13−m)Ag42 ternary nanoalloys." International Journal of Modern Physics C 29, no. 09 (September 2018): 1850084. http://dx.doi.org/10.1142/s0129183118500845.

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Structural optimization of ternary PdmPt[Formula: see text]Ag[Formula: see text] nanoalloys was performed using the basin-hopping algorithm, and the Gupta many-body potential was adopted to model interatomic interaction. The optimization results show that all compositions have a structure based on icosahedron with a core–shell segregation. While the Ag atoms prefer to segregate to the surface, Pd and Pt atoms were located at the core of the cluster due to the higher surface and cohesive energy. The single platinum atom with the highest cohesive energy in Pd[Formula: see text]Pt1Ag[Formula: see text] nanoalloy was located at the center of the cluster. Also in all other compositions except Pd[Formula: see text]Ag[Formula: see text], Pd atoms occupy the second shell position of the icosahedron structure. We used classical molecular dynamics (MD) simulations in canonical ensemble conditions (NVT) to investigate the melting temperatures of ternary PdmPt[Formula: see text]Ag[Formula: see text] nanoalloys with the interatomic interactions modeled by the same potential with optimizations. The icosahedral structures were taken as the initial configurations for MD simulations. We obtained caloric curves and Lindemann indexes to investigate the melting transitions. The simulation results showed that varying the composition gives rise to a fluctuation in melting temperatures. The highest melting temperature belongs to the Pd9Pt4Ag[Formula: see text] nanoalloy cluster within the other compositions. However, the relative stability investigation indicates the Pd8Pt5Ag[Formula: see text] nanoalloy cluster as the most stable composition. The Lindemann indexes obtained for the second and third shell of icosahedral structures show that the melting takes place as a whole without any surface premelting.
17

Xie, Xiaobin, Guanhui Gao, Shendong Kang, Yanhua Lei, Zhengyin Pan, Tamaki Shibayama, and Lintao Cai. "Toward hybrid Au nanorods @ M (Au, Ag, Pd and Pt) core–shell heterostructures for ultrasensitive SERS probes." Nanotechnology 28, no. 24 (May 24, 2017): 245602. http://dx.doi.org/10.1088/1361-6528/aa70f3.

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18

Tojo, Concha, David Buceta, and M. Arturo López-Quintela. "Core-Shell Nanocatalysts Obtained in Reverse Micelles: Structural and Kinetic Aspects." Journal of Nanomaterials 2015 (2015): 1–10. http://dx.doi.org/10.1155/2015/601617.

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Ability to control the metal arrangement in bimetallic nanocatalysts is the key to improving their catalytic activity. To investigate how metal distribution in nanostructures can be modified, we developed a computer simulation model on the synthesis of bimetallic nanoparticles obtained in microemulsions by a one-pot method. The calculations allow predicting the metal arrangement in nanoparticle under different experimental conditions. We present results for two couples of metals, Au/Pt (Δε=0.26 V) and Au/Ag (Δε=0.19 V), but conclusions can be generalized to other bimetallic pairs with similar difference in standard reduction potentials. It was proved that both surface and interior compositions can be controlled at nanometer resolution easily by changing the initial reactant concentration inside micelles. Kinetic analysis demonstrates that the confinement of reactants inside micelles has a strong effect on the reaction rates of the metal precursors. As a result, the final nanocatalyst shows a more mixed core and a better defined shell as concentration is higher.
19

Rashid, Muhammad, Tae-Sun Jun, Yongju Jung, and Yong Shin Kim. "Bimetallic core–shell Ag@Pt nanoparticle-decorated MWNT electrodes for amperometric H2 sensors and direct methanol fuel cells." Sensors and Actuators B: Chemical 208 (March 2015): 7–13. http://dx.doi.org/10.1016/j.snb.2014.11.005.

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20

Hossain, M. Jakir, Md Saidur Rahman, and Md Jafar Sharif. "Micromixer: An Effective Tool for the Production of Sub-Nanosized Noble Metal Particles." International Journal of Nanoscience 19, no. 06 (December 2020): 2050013. http://dx.doi.org/10.1142/s0219581x20500131.

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This paper demonstrates the functionality of a simple and convenient microfluidic method in synthesizing a series of poly(vinylpyrrolidone) (PVP) stabilized nanoparticles (NPs) of various novel metals (Pt, Pd, Ru, Rh, Ag, and Au) with an average diameter of [Formula: see text]2 nm. In this method, the use of microfluidic mixture provided a homogenous mixing of the metal precursors and reducing agent nearly at the molecular level, that yield monodispersed sub-nanosize NPs. Core diameters of the produced NPs determined by transmission electron microscopy (TEM), were [Formula: see text], [Formula: see text], [Formula: see text], [Formula: see text], [Formula: see text] and [Formula: see text][Formula: see text]nm for Pt, Pd, Ru, Rh, Ag and Au NPs, respectively. Of them, Pt NPs were detailed characterized. The obtained Pt NPs were found to have fcc crystal structure with 1.2 nm crystalline size which is very similar to the corresponding TEM result. The efficiency of the synthesis of NPs by micromixer was compared with batch/NaBH4 reduction method for the Pt NPs. It was found that in batch method the as-prepared NPs decreased the reducing ability of NaBH4 by catalytic degradation. In contrast, the micromixer could separate the produced metal NPs from the reaction system soon after the formation of NPs and enables feeding the fresh NaBH4 solution throughout the synthesis. Fourier Transform Infrared (FTIR) spectrometry measurements of adsorbed [Formula: see text]CO molecules on Pt NPs showed that the NPs surface were negatively charged with a high population of edge and vertices atoms.
21

Nadagouda, Mallikarjuna N., and Rajender S. Varma. "A Greener Synthesis of Core (Fe, Cu)-Shell (Au, Pt, Pd, and Ag) Nanocrystals Using Aqueous Vitamin C." Crystal Growth & Design 7, no. 12 (December 2007): 2582–87. http://dx.doi.org/10.1021/cg070554e.

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22

Qian, Hehe, Jianzhou Wu, Yongsheng Guo, and Wenjun Fang. "PdAgPt Corner-Satellite Nanocrystals in Well-Controlled Morphologies and the Structure-Related Electrocatalytic Properties." Nanomaterials 11, no. 2 (January 29, 2021): 340. http://dx.doi.org/10.3390/nano11020340.

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The functions of heterogeneous metallic nanocrystals (HMNCs) can be undoubtedly tuned by controlling their morphologies and compositions. As a less-studied kind of HMNCs, corner-satellite multi-metallic nanocrystals (CSMNCs) have great research value in structure-related electrocatalytic performance. In this work, PdAgPt corner-satellite nanocrystals with well-controlled morphologies and compositions have been developed by temperature regulation of a seed-mediated growth process. Through the seed-mediated growth, the morphology of PdAgPt products evolves from Pd@Ag cubes to PdAgPt corner-satellite cubes, and eventually to truncated hollow octahedra, as a result of the expansion of {111} facets in AgPt satellites. The growth of AgPt satellites exclusively on the corners of central cubes is realized with the joint help of Ag shell and moderate bromide, and hollow structures form only at higher reaction temperatures on account of galvanic displacement promoted by the Pd core. In view of the different performances of Pd and Pt toward formic acid oxidation (FAO), this structure-sensitive reaction is chosen to measure electrocatalytic properties of PdAgPt HMNCs. It is proven that PdAgPt CSMNCs display greatly improved activity toward FAO in direct oxidation pathway. In addition, with the help of AgPt heterogeneous shells, all PdAgPt HMNCs exhibit better durability than Pd cubes and commercial Pt.
23

Akbarzadeh, Hamed, Mohsen Abbaspour, Esmat Mehrjouei, and Maliheh Kamrani. "Stability Control of AgPd@Pt Trimetallic Nanoparticles via Ag–Pd Core Structure and Composition: A Molecular Dynamics Study." Industrial & Engineering Chemistry Research 57, no. 18 (April 12, 2018): 6236–45. http://dx.doi.org/10.1021/acs.iecr.8b00447.

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24

Yadav, Vamakshi, Soojin Jeong, Xingchen Ye, and Christina W. Li. "Surface-Limited Galvanic Replacement Reactions of Pd, Pt, and Au onto Ag Core Nanoparticles through Redox Potential Tuning." Chemistry of Materials 34, no. 4 (February 2, 2022): 1897–904. http://dx.doi.org/10.1021/acs.chemmater.1c04176.

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25

Shaik, Firdoz, Weiqing Zhang, and Wenxin Niu. "A Generalized Method for the Synthesis of Ligand-Free M@SiO2 (M = Ag, Au, Pd, Pt) Yolk–Shell Nanoparticles." Langmuir 33, no. 13 (March 27, 2017): 3281–86. http://dx.doi.org/10.1021/acs.langmuir.7b00141.

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26

Zeng, Sheng, Triratna Muneshwar, Saralyn Riddell, Ajay Peter Manuel, Ehsan Vahidzadeh, Ryan Kisslinger, Pawan Kumar, et al. "TiO2-HfN Radial Nano-Heterojunction: A Hot Carrier Photoanode for Sunlight-Driven Water-Splitting." Catalysts 11, no. 11 (November 14, 2021): 1374. http://dx.doi.org/10.3390/catal11111374.

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The lack of active, stable, earth-abundant, and visible-light absorbing materials to replace plasmonic noble metals is a critical obstacle for researchers in developing highly efficient and cost-effective photocatalytic systems. Herein, a core–shell nanotube catalyst was fabricated consisting of atomic layer deposited HfN shell and anodic TiO2 support layer with full-visible regime photoactivity for photoelectrochemical water splitting. The HfN active layer has two unique characteristics: (1) A large bandgap between optical and acoustic phonon modes and (2) No electronic bandgap, which allows a large population of long life-time hot carriers, which are used to enhance the photoelectrochemical performance. The photocurrent density (≈2.5 mA·cm−2 at 1 V vs. Ag/AgCl) obtained in this study under AM 1.5G 1 Sun illumination is unprecedented, as it is superior to most existing plasmonic noble metal-decorated catalysts and surprisingly indicates a photocurrent response that extends to 730 nm. The result demonstrates the far-reaching application potential of replacing active HER/HOR noble metals such as Au, Ag, Pt, Pd, etc. with low-cost plasmonic ceramics.
27

Yang, C., H. Lei, W. Z. Zhou, J. R. Zeng, Q. B. Zhang, Y. X. Hua, and C. Y. Xu. "Engineering nanoporous Ag/Pd core/shell interfaces with ultrathin Pt doping for efficient hydrogen evolution reaction over a wide pH range." Journal of Materials Chemistry A 6, no. 29 (2018): 14281–90. http://dx.doi.org/10.1039/c8ta04059a.

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The rational design and fabrication of highly efficient and durable all-pH catalysts for sustainable electrochemical hydrogen production are of critical importance to building renewable energy systems for the future.
28

Yang, Miao, Zhongzhu Chen, Yafei Luo, Jin Zhang, Rongxing He, Wei Shen, Dianyong Tang, and Ming Li. "A DFT Insight into Hashmi Phenol Synthesis Catalyzed by M6 @Au32 (M=Ag, Cu, Pd, Pt, Ru, Rh) Core-Shell Nanoclusters." ChemCatChem 8, no. 14 (June 21, 2016): 2367–75. http://dx.doi.org/10.1002/cctc.201600405.

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Akbarzadeh, Hamed, Esmat Mehrjouei, Amir Nasser Shamkhali, Samira Ramezanzadeh, Mohsen Abbaspour, and Sirous Salemi. "Stability of Pd@void@M (M=Ni, Ag, and Pt) yolk shell nanoparticles controlled by structural factors: A molecular dynamics perspective." Colloids and Surfaces A: Physicochemical and Engineering Aspects 610 (February 2021): 125920. http://dx.doi.org/10.1016/j.colsurfa.2020.125920.

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30

Mazloum-Ardakani, Mohammad, та Laleh Hosseinzadeh. "A Sensitive Electrochemical Aptasensor for TNF-α Based on Bimetallic Ag@Pt Core-Shell Nanoparticle Functionalized Graphene Nanostructures as Labels for Signal Amplification". Journal of The Electrochemical Society 163, № 5 (2016): B119—B124. http://dx.doi.org/10.1149/2.0241605jes.

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31

Meir, Noga, Ilan Jen-La Plante, Kobi Flomin, Elina Chockler, Brian Moshofsky, Mahmud Diab, Michael Volokh, and Taleb Mokari. "Studying the chemical, optical and catalytic properties of noble metal (Pt, Pd, Ag, Au)–Cu2O core–shell nanostructures grown via a general approach." J. Mater. Chem. A 1, no. 5 (2013): 1763–69. http://dx.doi.org/10.1039/c2ta00721e.

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32

Aslam, Umar, and Suljo Linic. "Addressing Challenges and Scalability in the Synthesis of Thin Uniform Metal Shells on Large Metal Nanoparticle Cores: Case Study of Ag–Pt Core–Shell Nanocubes." ACS Applied Materials & Interfaces 9, no. 49 (December 2017): 43127–32. http://dx.doi.org/10.1021/acsami.7b14474.

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33

Takagi, Nozomi, Kazuya Ishimura, Masafuyu Matsui, Ryoichi Fukuda, Masahiro Ehara, and Shigeyoshi Sakaki. "Core–Shell versus Other Structures in Binary Cu38–nMn Nanoclusters (M = Ru, Rh, Pd, Ag, Os, Ir, Pt, and Au; n = 1, 2, and 6): Theoretical Insight into Determining Factors." Journal of Physical Chemistry C 121, no. 19 (May 9, 2017): 10514–28. http://dx.doi.org/10.1021/acs.jpcc.6b13086.

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34

Jabłońska, Magdalena. "Progress on Noble Metal-Based Catalysts Dedicated to the Selective Catalytic Ammonia Oxidation into Nitrogen and Water Vapor (NH3-SCO)." Molecules 26, no. 21 (October 26, 2021): 6461. http://dx.doi.org/10.3390/molecules26216461.

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A recent development for selective ammonia oxidation into nitrogen and water vapor (NH3-SCO) over noble metal-based catalysts is covered in the mini-review. As ammonia (NH3) can harm human health and the environment, it led to stringent regulations by environmental agencies around the world. With the enforcement of the Euro VI emission standards, in which a limitation for NH3 emissions is proposed, NH3 emissions are becoming more and more of a concern. Noble metal-based catalysts (i.e., in the metallic form, noble metals supported on metal oxides or ion-exchanged zeolites, etc.) were rapidly found to possess high catalytic activity for NH3 oxidation at low temperatures. Thus, a comprehensive discussion of property-activity correlations of the noble-based catalysts, including Pt-, Pd-, Ag- and Au-, Ru-based catalysts is given. Furthermore, due to the relatively narrow operating temperature window of full NH3 conversion, high selectivity to N2O and NOx as well as high costs of noble metal-based catalysts, recent developments are aimed at combining the advantages of noble metals and transition metals. Thus, also a brief overview is provided about the design of the bifunctional catalysts (i.e., as dual-layer catalysts, mixed form (mechanical mixture), hybrid catalysts having dual-layer and mixed catalysts, core-shell structure, etc.). Finally, the general conclusions together with a discussion of promising research directions are provided.
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yakout El koraychy, El, Diana Nelli, Cesare Roncaglia, Chloé Minnai, and Riccardo Ferrando. "Growth of size-matched nanoalloys -- A comparison of AuAg and PtPd." European Physical Journal Applied Physics, March 14, 2022. http://dx.doi.org/10.1051/epjap/2022210297.

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The gas-phase growth of AuAg and PtPd clusters up to sizes $\sim$3 nm is simulated by Molecular Dynamics. Both systems are characterized by a very small size mismatch and by a tendency of the less cohesive element to segregate at the nanoparticle surface. The aim of this work is to figure out the differences in the behavior between these two bimetallic systems at the atomic level. For each system, three simulation types are performed, in which either one species or both species are deposited on preformed bimetallic seeds. Our results show that core@shell and intermixed chemical ordering arrangements can be obtained, in agreement with the available experimental data. In the case of core@shell arrangement, the purity of the surface layer is perfect for Ag-rich and Pd-rich nanoparticles, whereas in Au-rich and Pt-rich ones, some tendency to surface migration of minority atoms (Ag or Pd) is observed. This tendency is somewhat stronger for Ag than for Pd. The analysis of the internal arrangement of the nanoparticles indicates that in the growth process the mobility of Pd and Ag minority atoms is stronger than that of Au and Pt minority atoms.
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García-Ruiz, A. F., J. J. Velázquez Salazar, R. Esparza, and N. Castillo. "Structural Characterization of Nanoparticles Obtained by a Polyol Synthesis in the Bimetallic System Pt-Pd." MRS Proceedings 1372 (2012). http://dx.doi.org/10.1557/opl.2012.119.

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ABSTRACTA modified polyol synthesis has been utilized to study the different structures obtained in the bimetallic system of platinum (Pt) and palladium (Pd). Some results are shown in this work. Thermal methods under refluxing, carrying on the reaction up to 285 ºC, have been assayed to reduce metallic salts using ethylene glycol (EG) as reducer and polyvinylpyrrolidone (PVP) as protective reagent of the formed bimetallic nanoparticles. The special core-shell structure has been observed in these bimetallic nanoparticles, whose synthesis was assisted by Ag, showing polyhedral shapes. The average diameter size of the core has been estimated at 10 nm, and the diameter size of the shell in 13 nm, consequently the thickness of the shell is around 1.5 nm. Nanoparticles were structurally characterized with transmission electron microscopy (TEM), scanning transmission electron microscopy (STEM) equipped with detector to generate high angle annular dark field (HAADF) images. This kind of structures have been studied and utilized to increase successfully the catalytic properties of monometallic nanoparticles of Pt or Pd according to other works. Here, the synthesis procedure is described; as the main results, several images are presented showing the obtained bimetallic core-shell structures and their fast Fourier transform (FFT), and also the size and the elemental analysis of the nanoparticles are reported, concluding that this synthesis method is very efficient for preparing bimetallic core shell structures.
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Tojo, C., D. Buceta, and M. A. López-Quintela. "On the minimum reactant concentration required to prepare Au/M core-shell nanoparticles by the one-pot microemulsion route." Physical Sciences Reviews 5, no. 4 (December 7, 2019). http://dx.doi.org/10.1515/psr-2018-0045.

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Abstract The minimum reactant concentration required to synthesize Au/M (M = Ag, Pt, Pd, Ru …) core-shell nanoparticles by the one-pot microemulsion route was calculated by a simulation model under different synthesis conditions. This minimum concentration was proved to depend on the reduction potential of the slower metal M and on the rigidity of the surfactant film composing the microemulsion. Model results were tested by comparing with Au/M nanoparticles taken from literature. In all cases, experimental data obey model predictions. From this agreement, one can conclude that the smaller the standard potential of the slower reduction metal, the lower the minimum concentration needed to obtain core-shell nanoparticles. In addition, the higher the surfactant flexibility, the higher the minimum concentration to synthesize metal segregated nanoparticles. Model prediction allows to quantify which is the best value of concentration to prepare different pairs of core-shell Au/M nanoparticles in terms of nature of M metal in the couple and microemulsion composition. This outlook may become an advanced tool for fine-tuning Au/M nanostructures. Graphical Abstract:
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Xu, Huiping, Ray Twesten, Kathryn Guy, John Shapley, Charles Werth, Anatoly Frenkel, Duane Johnson, and Judith Yang. "Structural Changes of Bimetallic PdX/Cu (1-X) Nanocatalysts Developed for Nitrate Reduction of Drinking Water." MRS Proceedings 876 (2005). http://dx.doi.org/10.1557/proc-876-r4.8.

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AbstractReductive removal by hydrogeneration using supported Pd/M (M= Cu, Pt, Ag, Co, Fe, Mo, Ni, Rh, Ir, Mn and Cr) bimetallic catalysts has emerged as a promising alternative for nitrate removal in drinking water [1]. Fundamental understanding how the atomic arrangement of Pd and a second element, such as Cu, affect the activity nitrite reduction and selectivity of dinitrogen will be accomplished by coordinated synthesis (Shapley), activity/selectivity/efficiency measurements (Werth) and nanostructure determination (Yang & Xu). In this paper, we report a systematic study of novel polyvinylpyrrolidone (PVP) stabilized nanoscale Pd-Cu colloids, with homogeneous and narrow size distribution, with Pd: Cu ratios varying from 50:50 to 90:10. Initial measurements on catalytic activity for nitrate reduction demonstrated a dependence on the relative composition. Electron microscopy studies, including Z-contrast imaging [2], energy-dispersive X-ray emission (EDX), electron diffraction and high-resolution electron microscopy (HREM), revealed a surprising change in structure at the 80:20 Pd-Cu composition, where, with less than 80% Pd,the nanoparticle forms a core-shell structure but for nanoparticles containing 80% or more Pd, it is homogeneous. We are at the pivotal point of directly correlating these nano-structures with the catalytic activity. Such an understanding is essential for the efficient development of catalysts for the purification of drinking water.
39

Shintani, K., and S. Mizuno. "Nanomechanical study of synthesis of metallic core-shell clusters via coalescence." MRS Proceedings 1130 (2008). http://dx.doi.org/10.1557/proc-1130-w12-19.

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AbstractMorphological evolution of two metallic clusters of different elements at coalescence is investigated using molecular-dynamics (MD) simulation. All the pair combinations of the elements Ni, Cu, Au, Ag, Pt, and Pd are considered. The final structures of united bimetallic clusters are classified into three categories: epitaxial, core-shell, and alloyed. Which type of structure appears via coalescence depends on the size and temperature of clusters, which can be summarized in an observed structure map.
40

Kang, Hyungseok, Joo Sung Kim, Seok-Ryul Choi, Young-Hoon Kim, Do Hwan Kim, Jung-Gu Kim, Tae-Woo Lee, and Jeong Ho Cho. "Electroplated core–shell nanowire network electrodes for highly efficient organic light-emitting diodes." Nano Convergence 9, no. 1 (January 5, 2022). http://dx.doi.org/10.1186/s40580-021-00295-2.

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AbstractIn this study, we performed metal (Ag, Ni, Cu, or Pd) electroplating of core–shell metallic Ag nanowire (AgNW) networks intended for use as the anode electrode in organic light-emitting diodes (OLEDs) to modify the work function (WF) and conductivity of the AgNW networks. This low-cost and facile electroplating method enabled the precise deposition of metal onto the AgNW surface and at the nanowire (NW) junctions. AgNWs coated onto a transparent glass substrate were immersed in four different metal electroplating baths: those containing AgNO3 for Ag electroplating, NiSO4 for Ni electroplating, Cu2P2O7 for Cu electroplating, and PdCl2 for Pd electroplating. The solvated metal ions (Ag+, Ni2+, Cu2+, and Pd2+) in the respective electroplating baths were reduced to the corresponding metals on the AgNW surface in the galvanostatic mode under a constant electric current achieved by linear sweep voltammetry via an external circuit between the AgNW networks (cathode) and a Pt mesh (anode). The amount of electroplated metal was systematically controlled by varying the electroplating time. Scanning electron microscopy images showed that the four different metals (shells) were successfully electroplated on the AgNWs (core), and the nanosize-controlled electroplating process produced metal NWs with varying diameters, conductivities, optical transmittances, and WFs. The metal-electroplated AgNWs were successfully employed as the anode electrodes of the OLEDs. This facile and low-cost method of metal electroplating of AgNWs to increase their WFs and conductivities is a promising development for the fabrication of next-generation OLEDs.
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Habibullah, Giyaullah, Jitka Viktorova, and Tomas Ruml. "Current Strategies for Noble Metal Nanoparticle Synthesis." Nanoscale Research Letters 16, no. 1 (March 15, 2021). http://dx.doi.org/10.1186/s11671-021-03480-8.

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AbstractNoble metals have played an integral part in human history for centuries; however, their integration with recent advances in nanotechnology and material sciences have provided new research opportunities in both academia and industry, which has resulted in a new array of advanced applications, including medical ones. Noble metal nanoparticles (NMNPs) have been of great importance in the field of biomedicine over the past few decades due to their importance in personalized healthcare and diagnostics. In particular, platinum, gold and silver nanoparticles have achieved the most dominant spot in the list, thanks to a very diverse range of industrial applications, including biomedical ones such as antimicrobial and antiviral agents, diagnostics, drug carriers and imaging probes. In particular, their superior resistance to extreme conditions of corrosion and oxidation is highly appreciated. Notably, in the past two decades there has been a tremendous advancement in the development of new strategies of more cost-effective and robust NMNP synthesis methods that provide materials with highly tunable physicochemical, optical and thermal properties, and biochemical functionalities. As a result, new advanced hybrid NMNPs with polymer, graphene, carbon nanotubes, quantum dots and core–shell systems have been developed with even more enhanced physicochemical characteristics that has led to exceptional diagnostic and therapeutic applications. In this review, we aim to summarize current advances in the synthesis of NMNPs (Au, Ag and Pt).
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Mizuno, S., and K. Shintani. "Atomistic Study of Creation of Bimetallic Clusters by Coalescence." MRS Proceedings 1087 (2008). http://dx.doi.org/10.1557/proc-1087-v08-01.

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AbstractMetallic clusters show excellent performance as catalysts because of their high surface-to-volume ratio. An inert-gas aggregation source is an experimental method by which clusters are produced. In such a method, cluster coalescence is one of growth modes of clusters. Bimetallic clusters also attract much attention of researchers because of their novel physical and chemical properties. At coalescence of two metallic clusters of different species, alloying or core-shell structuring tends to occur spontaneously. Resulting alloyed clusters or core-shell clusters will behave as unique catalysts. In this paper, morphological evolution of two metallic clusters of different elements at coalescence is investigated using molecular-dynamics simulation. All pair combinations of the elements Au, Ag, Pt, and Pd are considered. The interactions between such metallic atoms are calculated by using generic embedded-atom method (GEAM) potential. Two clusters of icosahedral structure are equilibrated at specified temperature beforehand. The two clusters are put close to each other, where the nearest two atoms belonging to the two clusters, respectively, start to interact with each other. After coalescence the original surfaces of the two clusters decrease, and the surface energy is transformed into the kinetic energy. Consequently, the temperature of the united cluster rises. If this temperature is higher than the melting temperature, melting and local alloying at the interface occur. If alloying spreads into the united cluster, an alloyed bimetallic cluster is synthesized. If melting occurs only in one of the two clusters, and the atoms in liquid phase gradually cover the surface of the other cluster, a core-shell cluster appears. The morphological evolutions in the two modes of coalescence are followed, and under what conditions each mode of coalescence occurs is discussed.The results show that the surface energy and atom size of two clusters determine which mode is selected at coalescence.

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