Growth of vertically aligned bamboo-like carbon nanotubes from ammonia/methane precursors using a platinum catalyst

被引:35
作者
Brown, Billyde [1 ]
Parker, Charles B. [1 ]
Stoner, Brian R. [1 ,2 ]
Glass, Jeffrey T. [1 ]
机构
[1] Duke Univ, Dept Elect & Comp Engn, Durham, NC 27708 USA
[2] RTI Int, Ctr Mat & Elect Technol, Res Triangle Pk, NC 27709 USA
关键词
ELECTRICAL-STIMULATION; ELECTRODES; NANOPARTICLES; NANOMATERIALS; PURIFICATION; REDUCTION; METAL;
D O I
10.1016/j.carbon.2010.09.018
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Vertically aligned multi walled carbon nanotubes have been synthesized by microwave plasma enhanced chemical vapor deposition using ammonia/methane source gas mixtures and a platinum thin film catalyst on thermally oxidized silicon substrates The SiO2 layer served as a diffusion barrier to reduce PtSi formation and aide the formation of well dispersed catalytic nanoparticles Nevertheless, some degree of substrate-catalyst interaction occurred even with this diffusion barrier present Carbon nanotube growth using a relatively thick catalyst film was either inhibited or prevented altogether when increasing the duration of plasma pretreatment or by moving the substrate closer to the center of the plasma This was primarily attributed to increased substrate-catalyst interactions resulting in catalyst poisoning Decreasing the plasma pretreatment time or moving the substrate away from the center of the plasma improved the growth, increasing the length of the nanotubes Varying the catalyst film thickness enabled control of the diameter and density of the carbon nanotubes Transmission electron microscopy revealed a bamboo like structure with the orientation of internal compartments consistent with a base-growth mode (C) 2010 Elsevier Ltd All rights reserved
引用
收藏
页码:266 / 274
页数:9
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