Gas-phase catalytic growth of single-walled carbon nanotubes from carbon monoxide

Fundamentals, processes and applications of high-permittivity polymer–matrix composites

Carbon nanotubes: opportunities and challenges

The present invention provides device components geometries and fabrication strategies for enhancing the electronic performance of electronic devices based on thin films of randomly oriented or partially aligned semiconducting nanotubes. In certain aspects, devices and methods of the present invention incorporate a patterned layer of randomly oriented or partially aligned carbon nanotubes, such as one or more interconnected SWNT networks, providing a semiconductor channel exhibiting improved electronic properties relative to conventional nanotubes-based electronic systems.

Medium scale carbon nanotube thin film integrated circuits on flexible plastic substrates

The synthesis of bulk amounts of high quality single-walled carbon nanotubes (SWNTs) is accomplished by optimizing the chemical compositions and textural properties of the catalyst material used in the chemical vapor deposition (CVD) of methane A series of catalysts are derived by systematically varying the catalytic metal compounds and support materials The optimized catalysts consist of Fe/Mo bimetallic species supported on a novel silica−alumina multicomponent material The high SWNT yielding catalyst exhibits high surface-area and large mesopore volume at elevated temperatures Gram quantities of SWNT materials have been synthesized in ∼05 h using the optimized catalyst material The nanotube material consists of individual and bundled SWNTs that are free of defects and amorphous carbon coating This work represents a step forward toward obtaining kilogram scale perfect SWNT materials via simple CVD routes

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Large Scale CVD Synthesis of Single-Walled Carbon Nanotubes

Rope-like bundles of single-walled carbon nanotubes (SWNTs) similar to those obtained by laser vaporization and electric-are techniques were synthesized on a relatively large scale and at low cost by the catalytic decomposition of hydrocarbons at a temperature of about 1200 degrees C using an improved floating catalyst method. The SWNTs thus obtained have larger diameters and are self-organized into ropes. The addition of thiophene was found to be effective in promoting the growth of SWNTs and in increasing the yield of either SWNTs or multiwalled carbon nanotubes under different growth conditions. (C) 1998 American Institute of Physics. [S0003-6951(98)01125-5].

Large-scale and low-cost synthesis of single-walled carbon nanotubes by the catalytic pyrolysis of hydrocarbons

Anatase/rutile mixed crystal TiO2 nanomaterials were prepared by sol-gel method and modified by Sn/Cu single doping and co-doping. Sn doping promotes the transformation from anatase to rutile, while Cu doping inhibits the phase transformation. The inhibition effect of Cu doping on phase transition is stronger than that of Sn doping. Sn or Cu doping reduces the recombination rate, and co-doping produces a synergistic effect on the inhibition of recombination. The photocatalytic experiment results show that the photocatalytic activity of Sn-TiO2 is higher than that of pure TiO2 owing to higher quantum efficiency and light source absorption. The first order reaction rate constant increases from 0.00904 min-1 for pure TiO2 to 0.01476 min-1 for Sn-TiO2. Unexpected, the photocatalytic activities of Cu-TiO2 and Sn/Cu-TiO2 are lower than that of pure TiO2. Although Cu doping improves the quantum efficiency, it reduces the absorption of ultraviolet region significantly, which is the key reason for the decline of their photocatalytic performance.

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Influences of Sn/Cu single doping and CO-doping on the structure and photocatalytic property of anatase/rutile mixed crystal TiO2 nanomaterials under UV-visible light

L. L. He

Papers

Large-scale and low-cost synthesis of single-walled carbon nanotubes by the catalytic pyrolysis of hydrocarbons

Influences of Sn/Cu single doping and CO-doping on the structure and photocatalytic property of anatase/rutile mixed crystal TiO2 nanomaterials under UV-visible light