Papers by Keyword: Single Wall Carbon Nanotube

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Authors: Ke Xu, Cheng Dong Wu, Xiao Jun Tian, Ying Zhang, Zai Li Dong
Abstract: Single-wall carbon nanotubes are candidates for a number of building blocks in nanoscale electronics. With respect to the assembly of carbon nanotube field effect transistor, the dielectrophoresis technology is adopted, which assembles SWCNTs between the micro-electrodes, SWCNTs are affected by the electrophoretic force which is carried out by the related theoretical analysis in a nonuniform electric field. The driving electric field of dielectrophoresis is simulated by the comsol software. According to the simulation results, a number of the experiments are done. It turns out that the required experimental parameters of the efficient assembly of SWCNT were obtained. AFM scanning and electrical properties of SWCNTs show that the method can achieve the effective assembly of carbon nanotube field effect transistor. SWCNTs are driven in the microelectrode gap, having a good arrangement of uniform orientation and assembly results, and proportional to the arrangement density along the electrode width direction and the duration of DEP. Meanwhile, it also provides an effective method of assembly and manufacture for other one-dimensional nanomaterials assembly of nanoelectronic devices.
Authors: Kuldeep Kumar Saxena, Vivek Srivastava, Kamal Sharma
Abstract: The non-local formulation of elasticity has been introduced as a correction to the local theory in order to account for long ranged inter-atomic forces. This elasticity theory is useful to estimate the in-plane stiffness of Single Wall Carbon Nanotube. The non- local effect is present in Single Wall Carbon Nanotube through the introduction of a non-local nanoscale which depends of the material and a molecular internal characteristics length. This non-local nanoscale goes to zero at macro scale and hence the non-local effect vanishes with reference to classical mechanics. The resulting from the non-local elasticity theory is verified through molecular simulations results. For this study of non-local theory in analysis of Carbon Nanotube, the value of scale coefficient is about 0.7nm.
Authors: Fernand D.S. Marquis
Abstract: Owing to their exceptional stiffness, strength, thermal and electrical conductivity, carbon nanotubes have the potential for the development of nano composites materials for a wide variety of applications. In order to achieve the full potential of carbon nanotubes for structural, thermal and electrical multifunctional applications, both single wall carbon nanotubes (SWNTs), double wall nanotubes (DWNTs) and multi wall nanotubes (MWNTs) need to be developed into fully integrated carbon nanotube composites. Full integration of nanotubes requires their development beyond conventional composites so that the level of the non-nanotube material is designed to integrate fully with the amount of nanotubes and where the nanotubes are part of the matrix rather than a differing component, as in the case of conventional composites. In order to advance the development of multifunctional materials from nanotubes, this research is focused on the simultaneous control of structural properties, thermal and electrical conductivity of fully integrated carbon nanotube composites. These are hybrid material systems designed to surpass the limits of rule of mixtures engineering and composite design. The goals are to implement designs to fully mimic the properties of carbon nanotubes on larger scales for enhanced thermal and electrical management in addition to controlled strength and toughness. These new approaches involve, functionalization, dispersion, stabilization, alignment, polymerization and reaction bonding, in order to achieve full integration. Typical examples of polymeric and ceramic matrices, as well as other material systems are presented and discussed.
Authors: Phuri Kalnaowakun, Niyomwas Sutham, Suchart Chantaramanee
Abstract: The study of platinum/carbon black (Pt/CB) versus platinum/single wall carbon nanotubes (Pt/SWCNT) and drying temperature on the result products were investigated. The synthesized of Pt/CB versus Pt/SWCNT were used for coating on fluorine-doped tin oxide (FTO) conductive glasses and tested for electrical conductivity properties used for counter electrode in a dye-sensitized solar cell (DSSC).The result products were characterized in term of chemical composition and microstructure by scanning electron microscope technique (SEM), EDX (JEOL,JSM 5800 LV) and TEM analyses.
Authors: Xiao Feng Xie, Lian Gao, Jing Sun
Abstract: Two kinds of chemical functional single-wall carbon nanotubes (SWNTs) are covalently coupled into special V-type superstructure by the esterification in pyridine medium. Both SWNTs bundles and individual SWNTs can be bound effectively through the deacidification path. The esterification between different kinds of modified SWNTs takes place on their ends and the crystallinity of SWNTs are well remained during the course. Interestingly, the inclinations between coupled SWNTs are very closely to the ester bond angle (109o18’). Furthermore, the formation mechanism about the peculiar structure has been proposed in the paper. The results suggest that selected connection bonds will determine the different angles of coupled SWNTs.
Authors: Orsolya Koszor, Ferenc Wéber, Zófia Vértesy, Zsolt E. Horváth, Zoltán Kónya, László Péter Biró, Imre Kiricsi, Péter Arató, Csaba Balázsi
Abstract: Silicon nitride based composites with 3wt% of single wall carbon nanotubes and exfoliated graphite have been prepared. Optimisation of the manufacturing processes has been conducted to preserve the carbon nanotubes and exfoliated graphite in composites and to avoid damaging during high temperature processing. The first results show that carbon nanotubes and exfoliated graphite have a good contact to the surface of silicon nitride grains. In the case of increase of sintering pressure an increase of bending strength was achieved. It was found that microstructure features achieved by properly designed sintering parameters are the main responsible factors for the strength improvements.
Authors: Yasuo Morimoto, Masami Hirohashi, Masanori Horie, Akira Ogami, Takako Oyabu, Toshihiko Myojo, Masayoshi Hashiba, Yohei Mizuguchi, Tatsunori Kambara, Byeong Woo Lee, Etsushi Kuroda, Kazuhiro Yamamoto, Norihiro Kobayashi, Shigehisa Endoh, Kunio Uchida, Tetsuya Nakazato, Katsuhide Fujita, Junko Nakanishi, Isamu Tanaka
Abstract: Single-Wall Carbon Nanotubes (SWCNTs) Were Well-Dispersed Using Ultrasonication to Conduct an Intratracheal Instillation Study. The Geometric Mean Diameter and Length of the SWCNT in Distilled Water Including 0.1 % Triton X-100 Was 44 Nm and 0.69 μm, Respectively. Rats Intratracheally Received 0.2 Mg or 0.4 Mg of SWCNT, and a Control Group Received Intratracheal Instillation of Distilled Water Containing 0.1 % Triton X-100 . The Rats Were then Sacrificed at 3 Days, 1 Week, 1 Month, 3 Months and 6 Months after Instillation. Bronchoalveolar Lavage Fluid (BALF) and Pathological Features Revealed that the Dose of SWCNT Induced Persistent Neutrophil Infiltration in Rat Lungs. In the Cytokine-Induced Neutrophil Chemoattractants (CINCs) Family, the Concentrations of CINC-1 and CINC-2 in the BALF Increased Persistently in the SWCNT-Exposed Groups. the Concentration of HO-1 in the BALF Was Also up-Regulated Persistently in the Exposed Groups. These Data Suggested that Well-Dispersed SWCNT Had an Inflammatory Potential in the Present Study.
Authors: F.V. Golikov, A.S. Pozharov, E.D. Obraztsova, N.R. Arutyunyan, Serge V. Terekhov, A.I. Chernov, V.I. Konov, L.D. Iskhakova, A.S. Lobach
Abstract: In this work the method of single-wall carbon nanotube synthesis based on chemical vapor deposition from ethanol vapor has been developed. The films grown have been characterized in detail by the electron microscopy and the Raman scattering techniques. A typical split tangential mode (at 1592 cm-1) and a number of "breathing" modes (150-270 cm-1) have been revealed in the Raman spectra for a variety of synthesis regimes. It was possible to change the geometrical parameters of nanotubes by playing with the synthesis conditions. A key role of the catalyst (Co, Co:Mo) preparation has been revealed. A special procedure of the catalyst crystal growth has been developed.
Authors: Yu Wang, Dai Ning Fang, Guo Wei Ma, Ai Kah Soh
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