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Synthesis and Device Applications of High-Density aligned carbon nanotubes Using Low-Pressure Chemical Vapor Deposition and Stacked Multiple Transfer

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Nano Research 2010年第12期3卷 831-842页

作者： Chuan Wang Koungmin Ryu Lewis Gomez De Arco Alexander Badmaev Jialu Zhang Xue Lin Yuchi Che Chongwu Zhou Ming Hsieh Department of Electrical Engineering University of Southern CaliforniaLos AngelesCalifornia 90089USA

For nanotube-based electronics to become a viable alternative to silicon technology,high-density aligned carbon nanotubes are *** this paper,we report the combined use of low-pressure chemical vapor deposition and stacked multiple transfer to achieve high-density aligned *** using an optimized nanotube synthesis recipe,we have achieved high-density aligned carbon nanotubes with density as high as 30 tubes/μ*** addition,a facile stacked multiple transfer technique has been developed to further increase the nanotube density to 55 tubes/μ***,high-performance submicron carbon nanotube field-effect transistors have been fabricated on the high-density aligned *** removing the metallic nanotubes by electrical breakdown,the devices exhibit on-current density of 92.4μA/μm and normalized transconductance of 13.3μS/μ***,benchmarking with the aligned carbon nanotube transistors in the literature indicates that our devices exhibit the best performance so far,which is attributed to both the increased nanotube density and scaling down of channel *** study shows the great potential of using such high-density aligned nanotubes for high performance nanoelectronics and analog/RF applications.

关键词： aligned carbon nanotubes chemical vapor deposition high-density high performance transistors

Effects of Temperature and Catalyst Concentration on the Growth of aligned carbon nanotubes

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Tsinghua Science and Technology 2005年第6期10卷 729-735页

作者：拜晓东李聃王野梁吉 Department of Mechanical Engineering Tsinghua University

The effects of preheating and pyrolysis temperatures and catalyst concentration on the synthesis of aligned carbon nanotubes （CNTs） using ferrocene as the catalyst and xylene as the carbon source in chemical vapor deposition were experimentally studied. The as-grown aligned CNTs were characterized by field emission scanning electron microscopy, transmission electronic microscopy, high-resolution transmission electronic microscopy, and Raman spectroscopy. The growth rate, the diameters, and the degree of crystal structure of the aligned CNTs were all found to depend on the preheating and pyrolysis temperatures and the catalyst concentration. The optimized conditions for the growth of aligned CNTs resulted in a rapid growth rate of 20.4 um/min, with the CNTs having a good, uniform crystal structure, and clean surfaces with little amorphous carbon. The results also show that higher preheating temperatures and lower ferrocene concentrations favor the growth of single-walled CNTs.

关键词： aligned carbon nanotubes pyrolysis temperature preheating temperature ferrocene concentration

Effect of Particle Density on the aligned Growth of carbon nanotubes

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Journal of Wuhan University of Technology(Materials Science) 2004年第2期19卷 4-6页

作者：王升高 Wuhan Institute of Chemical Technology

aligned carbon nanotubes (CNTs) were prepared on Ni-coated Ni substrate by microwave plasma chemical vapor deposition (MWPCVD) with a mixture of methane and hydrogen gases at temperature of 550℃.The experimental results show a direct correlation between the alignment of CNTs and the density of the catalyst particles at low *** the particle density is high enough,among CNTs there are strong interactions that can inhibit CNTs from growing *** crowding effect among dense CNTs results in the aligned growth of CNTs at low temperature.

关键词： aligned carbon nanotubes high particle density microwave plasma chemical vapor deposition

Synthesis of aligned carbon nanotube with straight-chained alkanes by nebulization method

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Transactions of Nonferrous Metals Society of China 2010年第6期20卷 1012-1016页

作者：刘云泉陈小华杨植蒲玉兴易斌 College of Materials Science and Engineering Hunan University

aligned carbon nanotubes(CNTs)were synthesized by nebulized spray pyrolysis of solutions of organometallics in carbon precursor *** types of straight-chained alkanes including n-pentane,n-hexane,n-heptane and n-octane were used as precursor solvents for synthesis of aligned *** results from scanning electron microscopy,transmission electron microscopy and Raman spectroscopy show that the CNTs obtained from them have different diameters and degrees of graphitization. It is found that the n-heptane is the most suitable for the growth of aligned CNTs with high quality and *** thermodynamic properties of precursory carbon sources such as boiling point and formation enthalpy are considered to play a decisive role in the synthesis of *** will be very helpful for the controllable preparation of aligned CNTs at relatively low cost.

关键词： aligned carbon nanotubes nebulization straight-chained alkanes thermodynamic property

Electroluminescent Polymers and carbon nanotubes for Flat Panel Displays

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材料科学与工程学报 2000年第Z1期20卷 444-453页

作者： Liming Dai CSIRO Molecular Science Bag 10Clayton South Victcria 3169 Australia

polymeric light-emitting diodes(LEDs) with sufficient brightness. efficiencies, low driving voltages, and various interesting features have been reported. The relatively short device lifetime, however, still remains as a major problem to be solved before any commercial applications will be realized. In this regard,carbon nanotubes have recently been proposed as more robust electron field emitters for flat panel displays. We have synthesised large arrays of vertically aligned carbon nanotubes, from which micropatterns of the aligned nanotubes suitable for flat panel displays were fabricated on various substrates. In this paper, we summarise our work on the synthesis and microfabrication of electroluminescent polymers and carbon nanotubes for flat panel displays with reference to other complementary work as appropriate.

关键词： Flat Panel Displays flat panel displays aligned carbon nanotubes electroluminescent polymers device lifetime major problem