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Journal articles on the topic 'Nanotubes – Synthesis'

Author: Grafiati

Published: 4 June 2021

Last updated: 8 February 2022

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1

Zhang, Hai Dong, Yu Shen, and Xu Xu Zheng. "Synthesis of Mesoporous Silica Nanotube Bundles." Advanced Materials Research 233-235 (May 2011): 2375–78. http://dx.doi.org/10.4028/www.scientific.net/amr.233-235.2375.

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Mesoporous silica nanotube bundles with short channels were synthesized through a surfactant-templated process with the addition of dodecane. Transmission electron microscope (TEM) and high resolution scanning electron microscope (HRSEM) studies show that the channels of the silica nanotubes are parallel gathered in nano-size bundles. Each particle of these nano-size bundles contains less than 10 silica nanotubes. The length of the silica nanotube channel is about 200 nm while the pore size of the channels is about 11 nm. Dodecane solubilized in the hydrophobic cores of P123 micelles leads to

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2

Ranney, Elizabeth, John Mansfield, Kai Sun, and Johannes Schwank. "Effects of synthesis conditions on dimensions, structure, and oxygen content of photocatalytically active titania nanotubes." Journal of Materials Research 25, no. 1 (2010): 89–95. http://dx.doi.org/10.1557/jmr.2010.0011.

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In this study, we report a method for the formation and characterization of aligned arrays of amorphous titania nanotubes by anodic oxidation in thin titanium films on SiO2 substrates using fluoride-containing electrolytes. Trends in titania nanotube geometries as a function of synthesis conditions were established. A titania nanotube array surface area of approximately 178 m2/g is reported. The titania nanotubes transitioned to the rutile crystal structure when heated in air at 530 °C–705 °C. The degradation of methylene blue under UV light showed that lower fluoride concentrations in the syn

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3

Ling, Yun Han, Jun Jie Qi, X. F. Zou, X. M. Zhao, Xin De Bai, and Qing Ling Feng. "Synthesis and Evaluation of Antibacterial Titanate Nanotubes." Key Engineering Materials 280-283 (February 2007): 707–12. http://dx.doi.org/10.4028/www.scientific.net/kem.280-283.707.

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Antibacterial titanate nanotubes were synthesized by alkali digesting of metatitanic acid via hydrothermal route, following by cation-exchanged and immobilized with Ag+, Zn2+ and Cu2+. The conditions for nanotube synthesis and ion exchange were investigated; the microstructures of as-synthesized nanotubes were characterized by XRD, SEM, XPS and DTA/TG. The antibacterial performance of cation-doped titanate nanotubes was tested and evaluated by Escherichia Coli. and staphylococcus aureus.

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4

Kim, Jeong-Hyeon, Jong-Min Kim, Sungkyun Park, Kang Hyun Park, and Jae-Myung Lee. "Synthesis and cryogenic mechanical properties of CO2-blown carbon-reinforced polyurethane foam." Journal of Cellular Plastics 54, no. 4 (2017): 743–63. http://dx.doi.org/10.1177/0021955x17750389.

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In the present study, carbon-nanotube-polyurethane foams were synthesized by adding (0.02, 0.1, and 0.3 wt%) carbon nanotubes during the polymerization reaction between polyol and isocyanate liquids. After the synthesis process, the microstructural cell morphology of the carbon-nanotube-polyurethane foams, based on the amount of carbon nanotubes, was observed using field emission scanning electron microscopy. To evaluate the mechanical characteristics of the carbon-nanotube-polyurethane foams, temperature-dependent (20°C, −90°C, and −163°C) compressive tests were performed, and the results wer

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5

Kharlamova, Marianna V. "Investigation of growth dynamics of carbon nanotubes." Beilstein Journal of Nanotechnology 8 (April 11, 2017): 826–56. http://dx.doi.org/10.3762/bjnano.8.85.

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The synthesis of single-walled carbon nanotubes (SWCNTs) with defined properties is required for both fundamental investigations and practical applications. The revealing and thorough understanding of the growth mechanism of SWCNTs is the key to the synthesis of nanotubes with required properties. This paper reviews the current status of the research on the investigation of growth dynamics of carbon nanotubes. The review starts with the consideration of the peculiarities of the growth mechanism of carbon nanotubes. The physical and chemical states of the catalyst during the nanotube growth are

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6

Zheng, Hua Jing, Shi Jun Cheng, Ya Dong Jiang, and Jian Hua Xu. "Performance Optimization of Nanotubes Prepared by a Template Synthesis Method." Advanced Materials Research 557-559 (July 2012): 632–38. http://dx.doi.org/10.4028/www.scientific.net/amr.557-559.632.

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PEDOT nanotubes were prepared by a template synthesis method. Based on our template, it was deduced that there are two successive processes in the formation of nanotubes. The first step is soakage of the porous templates by a polymer solution, and the second step is adsorption of free charged cationic groups and doped PEDOT onto the template surface with negative charges. XRD results showed that well orientated PEDOT chain were formed during the synthesis, moreover the arrange conductivity of molecular chains strongly affect the structures of PEDOT nanotubes. The nanotubes were measured to be

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7

Zhang, A. Ying. "Study on the Synthesis Process of Carbon Nanotubes." Advanced Materials Research 926-930 (May 2014): 254–57. http://dx.doi.org/10.4028/www.scientific.net/amr.926-930.254.

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Current use and application of nanotubes has mostly been limited to the use of bulk nanotubes, which is a mass of rather unorganized fragments of nanotubes. Bulk nanotube materials may never achieve a tensile strength similar to that of individual tubes, but such composites may, nevertheless, yield strengths sufficient for many applications. Bulk carbon nanotubes have already been used as composite fibers in polymers to improve the mechanical, thermal and electrical properties of the bulk product. The strength and flexibility of carbon nanotubes makes them of potential use in controlling other

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8

Kharissova, Oxana V., Beatriz Ortega Garcia, Patsy Y. Arquieta Guillén, Hugo V. Galindo Cuevas, and Romeo Selvas Aguilar. "SYNTHESIS AND CHARACTERIZATION OF 3D CARBON NANOTUBES." MRS Advances 3, no. 1-2 (2018): 103–8. http://dx.doi.org/10.1557/adv.2018.181.

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ABSTRACTA nanomaterial that attracts the attention in a variety of research areas is multiwall carbon nanotubes (MWCNTs), due to their good mechanical proprieties, and high electrical and thermal conductivity. For this reason, the preparation of three-dimensional (3D) structures from them draws interest because it opens new horizons to produce materials with novel properties and useful applications. In this investigation the synthesis of 3D nanotube carbon (nanoforest type) functionalized with nanoparticles of silver, aluminum, and iron was studied. A 3D structure was produced in the form of a

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9

See, Chee Howe, and Andrew T. Harris. "On the Development of Fluidized Bed Chemical Vapour Deposition for Large-Scale Carbon Nanotube Synthesis: Influence of Synthesis Temperature." Australian Journal of Chemistry 60, no. 7 (2007): 541. http://dx.doi.org/10.1071/ch06398.

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The absence of large-scale carbon nanotube synthesis technology (which we define as being of the order of 10 000 tonnes per plant per year) is limiting research and development activities across the sector. We contend that fluidized bed chemical vapour deposition (FBCVD) is the most promising technology for large-scale, low-cost, carbon nanotube synthesis. In this work, multi-walled carbon nanotubes were synthesized on alumina-supported iron, cobalt, or nickel catalysts by catalytic chemical vapour deposition in a 0.5 kg h–1 FBCVD reactor, using ethylene as a carbon source. The carbon nanotube

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10

Leonhardt, A., Ingolf Mönch, Axel Meye, S. Hampel, and B. Büchner. "Synthesis of Ferromagnetic Filled Carbon Nanotubes and their Biomedical Application." Advances in Science and Technology 49 (October 2006): 74–78. http://dx.doi.org/10.4028/www.scientific.net/ast.49.74.

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Especially during last years, fundamental discoveries of various species and modifications of carbon nanotubes have stimulated research on their application including in human medicine. The success of these applications depends significantly on the physical, chemical and biological properties of the carbon nanotubes and their supplements. In our presentation we report on the synthesis of Fe-filled carbon nanotubes, their structural and magnetic properties and propose novel types of such functionalised and filled multiwalled carbon nanotubes with various advantages for an application in human m

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Needham, S. A., G. X. Wang, H. K. Liu, and L. Yang. "Nickel Oxide Nanotubes: Synthesis and Electrochemical Performance for Use in Lithium Ion Batteries." Journal of Nanoscience and Nanotechnology 6, no. 1 (2006): 77–81. http://dx.doi.org/10.1166/jnn.2006.17907.

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Uniform and aligned Nickel Oxide (NiO) nanotube bundles have been synthesized by a template process. Individual nanotubes are 60 μm long with a 200 nm outer diameter and wall thickness of 20–30 nm. The synthesis involved forming Ni(OH)2 nanotubes that were subsequently heated to 350°C in order to fully convert the product to NiO nanotubes. NiO nanotube powder was used in lithium-ion cells for assessment of lithium storage ability and electrochemical performance. Discharge capacity of the NiO nanotube electrode was in excess of 30% higher than that of the standard NiO nanocrystalline powder ele

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12

Wang, Ning, Hong Lin, Jian Bao Li, Xiao Zhan Yang, and Bo Chi. "Synthesis of Titanium Dioxide Nanotubes by Ion Exchange Approach." Materials Science Forum 475-479 (January 2005): 1235–38. http://dx.doi.org/10.4028/www.scientific.net/msf.475-479.1235.

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Nanotube-shaped powders had been synthesized successfully from commercial anatasetype titanium dioxide powder by ion exchange approach. All nanotubes were open-ended with 3~5 nm in inner diameter, 8~12 nm in outside diameter and 200~400 nm in length. EDS result revealed that the nanotube was only composed of Ti and O. XPS analysis showed that two peaks located at 458.5 and 464.2 eV were assigned to Ti4+ in titanium dioxide. The formation mechanism of titanium dioxide nanotubes was also discussed in this paper.

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13

Liu, Yuan Chao, Na Na Zheng, Jing Dong Huang, and Bao Min Sun. "Synthesis of Carbon Nanotubes with Typical Structure from the Pyrolysis Flame." Advanced Materials Research 221 (March 2011): 99–103. http://dx.doi.org/10.4028/www.scientific.net/amr.221.99.

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Synthesis of carbon nanotubes from V-type pyrolysis flame is a kind of new method. It has potential for carbon nanotubes preparation in mass production. Carbon monoxide was as carbon source and the acetylene/air premixed gas provides heat by combustion. Hydrogen/helium premixed gas acted as diluted and protection gas. Pentacarbonyl iron was served as catalyst. Carbon nanotubes with less impurity and high yield were captured successfully in the V-type pyrolysis flame. The diameter of carbon nanotubes was approximate between 10nm and 20nm, and its length was dozens of microns. The size of cataly

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14

Gayduchenko, Igor, Georgy Fedorov, Ramil Ibragimov, et al. "Synthesis of single-walled carbon nanotube networks using monodisperse metallic nanocatalysts encapsulated in reverse micelles." Chemical Industry 70, no. 1 (2016): 1–8. http://dx.doi.org/10.2298/hemind140910005g.

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We report on a method of synthesis of single-walled carbon nanotubes percolated networks on silicon dioxide substrates using monodisperse Co and Ni catalyst. The catalytic nanoparticles were obtained by modified method of reverse micelles of bis-(2-ethylhexyl) sulfosuccinate sodium in isooctane solution that provides the nanoparticle size control in range of 1 to 5 nm. The metallic nanoparticles of Ni and Co were characterized using transmission electron microscopy (TEM) and atomic-force microscopy (AFM). Carbon nanotubes were synthesized by chemical vapor deposition of CH4/H2 composition at t

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15

Zhang, Dengsong, Hongxia Fu, Liyi Shi, Jianhui Fang, and Qiang Li. "Carbon nanotube assisted synthesis of CeO2 nanotubes." Journal of Solid State Chemistry 180, no. 2 (2007): 654–60. http://dx.doi.org/10.1016/j.jssc.2006.11.025.

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Sun, Xiao Gang, Zhi Wen Qiu, Long Chen, et al. "Industrial Synthesis of Whisker Carbon Nanotubes." Materials Science Forum 852 (April 2016): 514–19. http://dx.doi.org/10.4028/www.scientific.net/msf.852.514.

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Since the first observation of carbon nanotubes (CNTs) in 1991, their synthesis techniques has been extensively investigated. The chemical vapor deposition (CVD) process have attracted much attention because of both their versatility and easy large scale production for CNTs . This paper is focused on a catalytic CVD-based method for synthesis of whisker multiwalled carbon nanotubes (WMWCNTs). The new type of carbon nanotube is similar to the whisker. The morphology of the WMWCNTs are very different from traditional carbon nanotubes prepared by traditional chemical vapor deposition process. The

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17

Kunarti, Eko Sri, and Grainne M. Moran. "A STUDY OF THE SYNTHESIS OF HYBRID ORGANOSILICATE NANOTUBES." Indonesian Journal of Chemistry 5, no. 2 (2010): 83–86. http://dx.doi.org/10.22146/ijc.21810.

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Hybrid organosilicate nanotubes have been prepared by sol-gel chemistry, using crystalline ammonium tartrate as the tube-forming template. The nanotubes were prepared by controlled hydrolysis and co-condensation of tetraethyl orthosilicate (TEOS) and methyltriethoxysilane (MTES) at room temperature. The synthetic conditions have been systematically studied. The physical characteristics of the materials were examined by scanning electron microscopy (SEM) and the aging times of the tubes due to slow post-gelation condensation reactions was investigated. The morphology and microstructure of the n

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18

Tony, V. C. S., Chun Hong Voon, Chang Chuan Lee, et al. "Microwave Irradiation Assisted Synthesis of Silicon Carbide Nanotubes." Materials Science Forum 857 (May 2016): 111–15. http://dx.doi.org/10.4028/www.scientific.net/msf.857.111.

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Conventional methods for the synthesis of silicon carbide were well studied and these methods included carbothermal reduction, mechanical milling, sol-gel process and others. However, conventional methods have limitations such as high energy consumption, presence of impurities and long reaction times. In this paper, microwave heating was applied for the first time for the synthesis of silicon carbide nanotube owing to the advantages of microwave heating such as shorter reaction time, uniform heat distribution and low cost. Mixture of silicon dioxide and carbon nanotube in the ratio of 1:3 as s

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19

Chau, Pham Thi Minh, and Jung Il Jin. "SYNTHESIS AND CHARACTERISTICS OF POLY(PARA-PHENYLENEVINYLENE)." ASEAN Journal on Science and Technology for Development 24, no. 1&2 (2017): 191–97. http://dx.doi.org/10.29037/ajstd.206.

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Poly(para-phenylenevinylene) [PPV] films and nanotubes were prepared via chemical vapor deposition polymerization (CVDP) by vapor phase pyrolysis of α, α'-dichloro p-xylene on the quartz plate, silicon wafers and Al2O3 membrane substrate with the pore size f = 100 nm. We prepared graphitic carbon films and carbon nanotubes by carbonizing the poly(para-phenylenevinylene) [PPV] films and nano parterns under thermal treatment range from 500°C to 900°C. When the PPV films on quartz plate were treated at 900°C highly oriented graphitic carbon films were obtained. The characterization of the PPV nan

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20

Liu, Yuan Chao, Ya Jie Zhang, Ya Jun Wu, and Bao Min Sun. "Carbon Nanotubes with Special Structure from the Pyrolysis Flame." Advanced Materials Research 261-263 (May 2011): 909–12. http://dx.doi.org/10.4028/www.scientific.net/amr.261-263.909.

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Carbon nanotube is the one-dimensional carbon nano-materials. The synthesis of carbon nanotubes from pyrolysis flame is a new method. Variety of carbon nanotubes with special structure can be seen from pyrolysis flame due to the influence of key factors such as the concentration of reactants and catalyst particle size. The morphology and structural of carbon nanotubes were characterized by scanning electron microscope and transmission electron microscopy respectively. Carbon nanotubes with special structure such as bamboo-like, pod-like and coil-like can be seen in the experiment. The bamboo-l

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21

Chi, Bo, Erick S. Victorio, and Tetsuro Jin. "Synthesis of TiO2-Based Nanotube on Ti Substrate by Hydrothermal Treatment." Journal of Nanoscience and Nanotechnology 7, no. 2 (2007): 668–72. http://dx.doi.org/10.1166/jnn.2007.147.

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TiO2-based titanate nanotube film was directly synthesized by hydrothermal treatment of Ti substrate in NaOH solution. The prepared high aspect ratio nanotubes have diameter of 10nm and pore size of 5 nm with length of several microns. The nanotubes show the same structure and component characteristics as the nanotubes prepared through hydrothermal treatment of TiO2. Other nanostructured titanate as oriented nanofiber film and translucent film were also prepared by adjusting the hydrothermal conditions. The formation mechanism of nanostructured titanate was discussed.

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Chipara, Mircea, Jessica Cruz, Edgar R. Vega, et al. "Polyvinylchloride-Single-Walled Carbon Nanotube Composites: Thermal and Spectroscopic Properties." Journal of Nanomaterials 2012 (2012): 1–6. http://dx.doi.org/10.1155/2012/435412.

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Nanocomposites of single-walled carbon nanotubes dispersed within polyvinylchloride have been obtained by using the solution path. High-power sonication was utilized to achieve a good dispersion of carbon nanotubes. Thermogravimetric analysis revealed that during the synthesis, processing, or thermal analysis of these nanocomposites the released chlorine is functionalizing the single-walled carbon nanotubes. The loading of polyvinylchloride by single-walled carbon nanotubes increases the glass transition temperature of the polymeric matrix, demonstrating the interactions between macromolecular

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Thurakitseree, Theerapol, and Chupong Pakpum. "Low-Cost Sputtering Process for Carbon Nanotubes Synthesis." Applied Mechanics and Materials 891 (May 2019): 195–99. http://dx.doi.org/10.4028/www.scientific.net/amm.891.195.

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According to their wonderful properties, carbon nanotubes (CNTs) have been well known for decades. The synthesis process and catalyst deposition method have also drawn attention to control the nanotube structure and properties. Sputtering method is then one promising option to grow the nanotubes in mass production. This method is, however, still costly. Here, we have presented a simple low-cost custom-made DC magnetron sputtering for catalyst thin film deposition. Three different metal thin films (Fe, Ni, Cu) deposited on Si substrates have been employed to investigate nanotube production. Pri

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Liu, Jie, Shoushan Fan, and Hongjie Dai. "Recent Advances in Methods of Forming Carbon Nanotubes." MRS Bulletin 29, no. 4 (2004): 244–50. http://dx.doi.org/10.1557/mrs2004.75.

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AbstractSince their discovery, carbon nanotubes, both single-walled and multiwalled, have been a focus in materials research. Fundamental research and application development hinge on high-quality nanotube materials and controlled routes to their organization and assembly. The aim of this article is to provide updated information on recent progress in the synthesis of carbon nanotubes.

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Dikio, Ezekiel D., Albert J. Kupeta, and Force T. Thema. "A Comparative Study of the Effect of MgO and CaCO3as Support Materials in the Synthesis of Carbon Nanotubes with Fe/Co as Catalyst." Journal of Chemistry 2014 (2014): 1–6. http://dx.doi.org/10.1155/2014/641823.

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A comparative study of the effect of magnesium oxide and calcium carbonate as support material in the synthesis of carbon nanotubes using the catalyst Fe/Co is presented. The synthesized carbon nanotubes were characterized with Raman spectroscopy, scanning electron spectroscopy (SEM), high-resolution transmission electron microscopy (HRTEM), X-ray diffraction spectroscopy (XRD), and energy dispersive spectroscopy (EDS). The morphology of the carbon nanotubes synthesized with magnesium oxide as support material gives rise to carbon nanotubes with consistent and well-defined structure unlike tha

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Han, Ki Bong, and Yong Ho Choi. "Characterization of Contact Resistance between Carbon Nanotubes Film and Metal Electrodes." Advanced Materials Research 683 (April 2013): 238–41. http://dx.doi.org/10.4028/www.scientific.net/amr.683.238.

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Carbon nanotube has attracted great research attentions due to its outstanding electrical, physical, mechanical, chemical properties. Based on its excellent properties, the carbon nanotube is promising nanoscale material for novel electrical, mechanical, chemical, and biological devices and sensors. However, it is very difficult to control the structure of carbon nanotube during synthesis. A carbon nanotubes film has 3 dimensional structures of interwoven carbon nanotubes as well as unique properties such as transparency, flexibility and good electrical conductivity. More importantly, the prop

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Liu, Yuan Chao, Li Zhi Wu, and Jing Hao Ren. "Experimental Analysis of the Long Carbon Nanotubes Formation from Controllable Flame." Advanced Materials Research 1048 (October 2014): 383–86. http://dx.doi.org/10.4028/www.scientific.net/amr.1048.383.

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Flame method is a new and simple method which may has the possibility of large-scale mass production for the synthesis of carbon nanotubes. It needs not the vacuum environment and carbon nanotubes can be captured at the normal atmospheric pressure. Synthesis of carbon nanotubes from the controllable flame is a new method. It can effectively avoid the defect of the traditional flame method. Experimental apparatus is mainly including controllable flame burner with its ancillary equipment, measuring instrument and catalyst preparation system, etc. The process of formation and growth for carbon na

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Han, Catherine Y., Zhi-Li Xiao, H. Hau Wang, Xiao-Min Lin, Susana Trasobares, and Russell E. Cook. "Facile Synthesis of Highly Aligned Multiwalled Carbon Nanotubes from Polymer Precursors." Journal of Nanomaterials 2009 (2009): 1–11. http://dx.doi.org/10.1155/2009/562376.

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We report a facile one-step approach which involves no flammable gas, no catalyst, and no in situ polymerization for the preparation of well-aligned carbon nanotube array. A polymer precursor is placed on top of an anodized aluminum oxide (AAO) membrane containing regular nanopore arrays, and slow heating under Ar flow allows the molten polymer to wet the template through adhesive force. The polymer spread into the nanopores of the template to form polymer nanotubes. Upon carbonization the resulting multi-walled carbon nanotubes duplicate the nanopores morphology precisely. The process is demo

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Li, Phoebe, Christopher L. Stender, Emilie Ringe, Laurence D. Marks, and Teri W. Odom. "Synthesis of TaS2 Nanotubes From Ta2O5 Nanotube Templates." Small 6, no. 10 (2010): 1096–99. http://dx.doi.org/10.1002/smll.201000226.

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KUMAR, RAJESH, RAM MANOHAR YADAV, KALPANA AWASTHI, R. S. TIWARI, and O. N. SRIVASTAVA. "EFFECT OF NITROGEN VARIATION ON THE SYNTHESIS OF VERTICALLY ALIGNED BAMBOO-SHAPED C–N NANOTUBES USING SUNFLOWER OIL." International Journal of Nanoscience 10, no. 04n05 (2011): 809–13. http://dx.doi.org/10.1142/s0219581x11008502.

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To examine the role of NH3 on bundles of aligned bamboo-shaped carbon–nitrogen (C–N) nanotube were synthesized the pyrolysis of ferrocene (Fe(C5H5)2) and sunflower oil mixtures with NH3 being the source of nitrogen. The concentration of NH3 was varying in volume (vol). Optimized temperature and concentration of ferrocene were 825°C and 10 mg/ml, respectively. With the increase of nitrogen concentration the bundles are breaking in nearly equal parts. With nitrogen doping, the nanotubes have a bamboo-like structure and reveal degraded crystallinity of graphitic sheets. Nitrogen plays key role in

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Wiak, Sławomir, Anna Firych-Nowacka, Krzysztof Smółka, Łukasz Pietrzak, Zbigniew Kołaciński, and Łukasz Szymański. "Induction heating process of ferromagnetic filled carbon nanotubes based on 3-D model." Open Physics 15, no. 1 (2017): 1061–66. http://dx.doi.org/10.1515/phys-2017-0134.

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AbstractSince their discovery by Iijima in 1991 [1], carbon nanotubes have sparked unwavering interest among researchers all over the world. This is due to the unique properties of carbon nanotubes (CNTs). Carbon nanotubes have excellent mechanical and electrical properties with high chemical and thermal stability. In addition, carbon nanotubes have a very large surface area and are hollow inside. This gives a very broad spectrum of nanotube applications, such as in combination with polymers as polymer composites in the automotive, aerospace or textile industries. At present, many methods of n

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Fang, Chunxia, Shengyi Zhang, Pengfei Zuo, et al. "Nanotube–nanotube transformation synthesis and electrochemistry of crystalline CuAgSe nanotubes." Journal of Crystal Growth 311, no. 8 (2009): 2345–51. http://dx.doi.org/10.1016/j.jcrysgro.2009.02.003.

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Mittal, J. "Synthesis of Co Filled Carbon Nanotubes by In Situ Reduction of CoCl2 Filled Nanotubes by NaBH4." ISRN Materials Science 2013 (July 14, 2013): 1–4. http://dx.doi.org/10.1155/2013/732974.

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An alternative process of filling the multiwall nanotubes (MWCNTs) with cobalt metal was developed. Empty core of nanotubes was first filled with CoCl2 by stirring with CoCl2 and alcohol at room temperature for six hours. CoCl2 filling inside MWCNTs was then converted into Co after treating with NaBH4 at room temperature. High resolution transmission electron microscope (HRTEM) studies showed the filling of the CoCl2 and Co inside the nanotubes before and after the treatment. EDX studies show the nonexistence of chlorine after the reduction with NaBH4. Amount of filling was also reduced after

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Suzuki, Yoshikazu, and Susumu Yoshikawa. "Synthesis and Thermal Analyses of TiO2-Derived Nanotubes Prepared by the Hydrothermal Method." Journal of Materials Research 19, no. 4 (2004): 982–85. http://dx.doi.org/10.1557/jmr.2004.0128.

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TiO2-derived nanotubes were prepared by hydrothermal treatment of TiO2 powder in NaOH aqueous solution. High-temperature x-ray diffraction (HT-XRD) andthermogravimetry-differential thermal analysis (TG-DTA) demonstrated the formation of TiO2 (B) phase (a metastable polymorph of titanium dioxide) from the nanotubes under heating at ∼800 °C, which indicates the as-prepared nanotubes should be composed of layered titanate, most probably as H2Ti3O7·nH2O (n < 3). Dehydration behavior and phase transformation confirmed by the HT-XRD study have suggested reliable reaction path and have well-solved

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Thai, Tien Thuy, Quyen Van Le, Tuyen Van Au, Nhi Hai Ha, Hung Huu Khanh Nguyen, and Xuan Thi Kieu Huynh. "Synthesis of TiO2 nanotubes by electrochemical anodization method for photocatalytic application." Science and Technology Development Journal 16, no. 2 (2013): 5–12. http://dx.doi.org/10.32508/stdj.v16i2.1435.

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Self–organized TiO2 nanotube arrays were synthesized by anodization of Ti foil in ethylene glycol electrolyte containing water and NH4F. The photocatalytic activities of fabricated samples were evaluated by the degradation of methylene blue under UV A irradiation. Various factors such as electrolyte composition, voltage, anodization time, annealing time were also investigated in order to find out the conditions for synthesis of TiO2 nanotube arrays which show the highest photocatalytic activity. The as–synthesized TiO2 nanotubes were highly ordered, with the inner diameter of 6–130nm and the l

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LAO, J. Y., J. G. WEN, D. Z. WANG, and Z. F. REN. "SYNTHESIS OF AMORPHOUS SiOx NANOSTRUCTURES." International Journal of Nanoscience 01, no. 02 (2002): 149–57. http://dx.doi.org/10.1142/s0219581x02000127.

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Various amorphous SiO x nanotube structures nucleated by GeOx nanoparticles were synthesized by thermal evaporation method. The presence of Ge does not only nucleate the growth of the SiO x nanomaterials, but also dopes them. The nanostructure morphology is affected by the substrate temperature, source temperature and GeO x vapor density through their effect on the size and lifetime of the nucleation center. In general, low substrate temperature promotes the formation of the nanotube bundle structure with 2–3% atomic ratio of Ge doping, and high temperature produces Ge-free much less bundled n

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Zhang, Fen, Shou Gang Chen, Yan Sheng Yin, Chao Rui Xue, and Chan Lin. "Hydrothermal Synthesis of BaTiO₃ Nanotubes on Ti Substrates." Advanced Materials Research 79-82 (August 2009): 617–20. http://dx.doi.org/10.4028/www.scientific.net/amr.79-82.617.

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A novel, low-temperature two-step synthesis method for producing BaTiO3 thin films patterned in the form of nanotubes on Ti substrates is reported. Firstly, the Ti substrate is anodized to produce a surface layer of amorphous TiO2 nanotube arrays. Secondly, the anodized substrate is subjected to hydrothermal treatment in aqueous Ba(OH)2, where the nanotube arrays serve as templates for their hydrothermal conversion to single-crystal BaTiO3 thin film. This opens the possibility of tailoring the nanotube arrays and their combinations in the hydrothermal bath, to produce ordered, patterned thin f

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Bahrami, Afarin, Z. A. Talib, W. Mahmood Mat Yunus, Kasra Behzad, and Nayereh Soltani. "Synthesis and Physical Characterization of Carbon Nanotubes Coated by Conducting Polypyrrole." Advanced Materials Research 364 (October 2011): 50–54. http://dx.doi.org/10.4028/www.scientific.net/amr.364.50.

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This study describes the preparation of polypyrrole multiwall carbon nanotube (PPy/MWNT) composites by in situ chemical oxidative polymerization. Various ratios of functionalized MWNTs are dispersed in the water, and PPy are then synthesized via in-situ chemical oxidative polymerization on the surface of the carbon nanotubes. The morphology of the resulting complex nanotubes (MWNT-PPY) was characterized by field-emission scanning electron microscopy (FESEM). The conductivity of each composite showed a maximum in the temperature scale of 120 – 160 °C and then decreased dramatically with the inc

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Le, Thang Van. "Production single-walled carbon nanotubes by chemical vapor deposition from mechanism to patterned growth for electro devices." Science and Technology Development Journal 16, no. 1 (2013): 64–71. http://dx.doi.org/10.32508/stdj.v16i1.1420.

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The ability to controllably obtain ordered carbon nanotube architectures is important to fundamental characterizations and potential applications of electrical devices. Controlled synthesis involving chemical vapor deposition (CVD) has been an effective strategy to order singlewalled nanotubes (SWNTs) on patterned catalyst. In this paper, Single-walled carbon nanotubes are synthesized by chemical vapor deposition of methane at controlled locations on a silicon substrate. This synthetic approach has allowed individual SWNT wires to be grown from controlled surface sites by catalyst patterning a

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Li, Z. G., L. Liang, P. J. Fagan, and M. van Kavelaar. "The Three-Dimensional shape of carbon nanotubes by High Resolution Electron Microscopy." Proceedings, annual meeting, Electron Microscopy Society of America 51 (August 1, 1993): 754–55. http://dx.doi.org/10.1017/s042482010014960x.

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Following the discovery of a large scale synthesis of fullerenes, the existence of the related carbon nanotubes was suggested by high resolution electron microscopy (HREM). Larger scale syntheses of these nanotube-rich materials has now been reported and has sparked interest worldwide. Because the HREM technique essentially observes the projection of a three dimensional object onto a two-dimensional plane, the three dimensional shape of the object is usually not apparent in typical HREM images. However, as we report here, by rotating along the axis of single carbon nanotube, and recording the

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Chitranshi, Megha, Anuptha Pujari, Vianessa Ng, et al. "Carbon Nanotube Sheet-Synthesis and Applications." Nanomaterials 10, no. 10 (2020): 2023. http://dx.doi.org/10.3390/nano10102023.

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Decades of extensive research have matured the development of carbon nanotubes (CNTs). Still, the properties of macroscale assemblages, such as sheets of carbon nanotubes, are not good enough to satisfy many applications. This paper gives an overview of different approaches to synthesize CNTs and then focuses on the floating catalyst method to form CNT sheets. A method is also described in this paper to modify the properties of macroscale carbon nanotube sheets produced by the floating catalyst method. The CNT sheet is modified to form a carbon nanotube hybrid (CNTH) sheet by incorporating met

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Inoue, Masashi, Kouta Asai, Yoshiyuki Nagayasu, Koji Takane, and Eriko Yagasaki. "Synthesis of Carbon Nanotubes by the Catalytic Decomposition of Methane." Advances in Science and Technology 48 (October 2006): 67–72. http://dx.doi.org/10.4028/www.scientific.net/ast.48.67.

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The influence of morphology of the support particles upon the nickel-catalyzed decomposition of methane into carbon nanotubes and hydrogen was explored using a thermogravimetric apparatus. High carbon nanotube yield was attained by the Ni catalysts supported on the glycothermally synthesized ZrO2 and Er3Ga5O12 particles, which had spherical shapes. Quite high carbon yield was also obtained by the Ni catalyst supported on spherical Al2O3 particles (Nanophase Tech. Corp.). It was concluded that the most important factor governing the carbon yield is the morphology of the catalyst support, which

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Pi, Zhenbang, Tian Tian, Xike Tian, Chao Yang, Suxin Zhang, and Jianhua Zheng. "A Template-Based Electrochemical Method for the Synthesis of High Dense Nickel Nanotube Arrays." Journal of Nanoscience and Nanotechnology 7, no. 2 (2007): 673–76. http://dx.doi.org/10.1166/jnn.2007.127.

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High dense Ni nanotube arrays have been successfully fabricated using electrochemical method with the assistance of anodic aluminum oxide (AAO) template from NiSO4 aqueous solution without any additive. Field emission scanning electron microscope (FE-SEM) results indicate that the pores of AAO template are high uniform and all the pores are filled with Ni nanotubes. Transmission electron microscope (TEM) results demonstrate that the diameter of Ni nanotubes is about 65 nm. The electron diffraction (ED) pattern results show that the Ni nanotubes are polycrystalline. X-ray diffraction (XRD) patt

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Oh, Han Jun, Jong Ho Lee, Seung Hyun Lee, and Choong Soo Chi. "Synthesis of Eu-Doped TiO₂ Nanotubes Using Electrochemical Oxidation." Key Engineering Materials 543 (March 2013): 188–91. http://dx.doi.org/10.4028/www.scientific.net/kem.543.188.

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To improve the photocatalytic properties of titania photocatalyst by incorporated Eu element during electrochemical oxidation, Eu-doped titanium oxide nanotube was synthesized by anodic process in an ethylene glycol electrolyte with Eu (NO3)3 as an additive. The crystalline structure and surface characteristics of Eu-doped titania nanotube were investigated. The XPS results indicate the migration of the europium element into the titania nanotube layer from mixture electrolyte during electrochemical oxidation. The Eu-doped titania nanotubes show much higher activity of dye degradation.

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Dresselhaus, M. S., and H. Dai. "Carbon Nanotubes: Continued Innovations and Challenges." MRS Bulletin 29, no. 4 (2004): 237–43. http://dx.doi.org/10.1557/mrs2004.74.

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AbstractThis article outlines the content of the April 2004 issue of MRS Bulletin on Advances in Carbon Nanotubes. Essentially, carbon nanotubes are self-assembling nanostructures constructed of sheets of hexagonal-shaped carbon atoms rolled up into cylinders. Carbon nanotubes have attracted a great deal of attention as model systems for nanoscience and for potential applications. The special interest in carbon nanotubes stems from their unique structure and properties: their very small size (down to ∼0.42 nm in diameter); the possibility for carbon nanotubes to be metallic or semiconducting,

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Gutnik, I. V., T. P. Dyachkova, A. V. Rukhov, et al. "Polyaniline/Carbon Nanotubes Composites: Kinetic Laws of Synthesis, Morphology and Properties." Advanced Materials & Technologies, no. 4 (2018): 054–68. http://dx.doi.org/10.17277/amt.2018.04.pp.054-068.

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Hayashi, Ya, Ya Masaki, and R. Yamada. "Synthesis of Single-Walled Carbon Nanotubes in Dusty Glow-Discharge Plasma." Ukrainian Journal of Physics 59, no. 4 (2014): 411–14. http://dx.doi.org/10.15407/ujpe59.04.0411.

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Shiratori, Tatsuya, Ichiro Yamane, Shoto Nodo, et al. "Synthesis of Boron Nitride Nanotubes Using Plasma-Assisted CVD Catalyzed by Cu Nanoparticles and Oxygen." Nanomaterials 11, no. 3 (2021): 651. http://dx.doi.org/10.3390/nano11030651.

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We found that oxidized Cu nanoparticles can catalyze the growth of boron nitride nanotubes from borazine via plasma-assisted chemical vapor deposition. The Raman spectra suggest that the formation of thin-walled nanotubes show a radial breathing mode vibration. The presence of oxygen in the plasma environment was necessary for the growth of the nanotubes, and a part of the nanotubes had a core shell structure with a cupper species inside it. In atomic resolution transmission electron microscope (TEM) images, Cu2O was found at the interface between the Cu-core and turbostratic BN-shell. The gro

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Bavykin, Dmitry V., Barbara A. Cressey, and Frank C. Walsh. "Low-Temperature Synthesis of Titanate Nanotubes in Aqueous KOH." Australian Journal of Chemistry 60, no. 2 (2007): 95. http://dx.doi.org/10.1071/ch06359.

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Although hydrothermal alkaline treatment of TiO2 in a concentrated, aqueous solution of KOH usually results in the formation of solid fibrous titanates, analysis of the temperature dependence of Ti(iv) concentration in KOH solution and comparison of these data with that for NaOH solution suggests that, at low temperatures, the treatment of TiO2 with KOH may result in formation of titanate nanotubes. This result was confirmed by 12 days treatment of TiO2 in 10 mol dm–3 KOH at 56°C, resulting in the formation of nanotubular titanates with similar morphology to those produced in a shorter time at

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Scott, Lawrence T. "Methods for the chemical synthesis of carbon nanotubes: an approach based on hemispherical polyarene templates." Pure and Applied Chemistry 89, no. 6 (2017): 809–20. http://dx.doi.org/10.1515/pac-2016-1222.

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AbstractHemispherical polyarenes represent attractive templates from which carbon nanotubes of the same diameter and rim structure (chirality) might be grown by repetitive annulation reactions. The resulting single-index (n,m) nanotubes would have one end open and the other end capped by the original template. Efforts in the author’s laboratory to synthesize (5,5) and (6,6) nanotube end-caps are described. Nitroethylene is shown to serve well as a “masked acetylene” for the conversion of polyarene bay regions into new unsubstituted benzene rings by a Diels-Alder cycloaddition/aromatization pro

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