Scanning tunneling microscope investigation of carbon nanotubes produced by catalytic decomposition of acetylene
Scanning tunneling microscope investigation of carbon nanotubes produced by catalytic decomposition of acetylene
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DOI：
10.1103/physrevb.56.12490
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发表时间：
1997-11-15
影响因子：
3.7
通讯作者：
Lucas, AA
中科院分区：
文献类型：
--
作者：
Biro, LP;Lazarescu, S;Lucas, AA
利用扫描隧道显微镜（STM）对负载型过渡金属催化剂催化乙炔分解制备的碳纳米管进行了研究。发现了直径在10 nm范围内的纳米管和直径小至1 nm的纳米管，讨论了STM图像形成和图像解卷积与针尖形状的关系，以及分别在10 nm和1 nm范围内测量STM纳米管直径时必须施加的校正。分析了碳纳米管在石墨表面的跨台阶行为。在单壁纳米管受到强机械应力的区域中测量的修改的高度值指示电导率的几个数量级的变化。碳纳米管被发现是很好的候选人，用于STM针尖形状表征在nm范围内。
A detailed scanning tunneling microscopy (STM) study of carbon nanotubes prepared by catalytic decomposition of acetylene over a supported transition metal catalyst is reported. Nanotubes with diameters in the 10-nm range and others with diameters as small as 1 nm were found. The mechanism of STM image formation and image deconvolution with respect to the tip shape are discussed, as well as the corrections which have to be applied when measuring by STM nanotube diameters in the ranges of 10 nm and of 1 nm, respectively. The behavior of a nanotube crossing steps on the graphite surface is analyzed. Modified height values measured on a single-wall nanotube in regions where it was subjected to strong mechanical stresses indicate changes in the electrical conductivity by several orders of magnitude. Carbon nanotubes are found to be good candidates to be used for STM tip shape characterization in the nm range.