Spatially Resolved Temperature Measurements of Electrically Heated Carbon Nanotubes

被引：89

作者：

Deshpande, Vikram V. ^{[2
]}

Hsieh, Scott ^{[2
]}

Bushmaker, Adam W. ^{[1
]}

Bockrath, Marc ^{[2
]}

Cronin, Stephen B. ^{[1
]}

机构：

[1] Univ So Calif, Dept Elect Engn, Los Angeles, CA 90089 USA

[2] CALTECH, Pasadena, CA 91125 USA

来源：

PHYSICAL REVIEW LETTERS | 2009年 / 102卷 / 10期

基金：

美国国家科学基金会;

关键词：

TRANSPORT; SPECTRA;

D O I：

10.1103/PhysRevLett.102.105501

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Spatially resolved Raman spectra of individual pristine suspended carbon nanotubes are observed under electrical heating. The Raman G(+) and G(-) bands show unequal temperature profiles. The preferential heating is more pronounced in short nanotubes (2 mu m) than in long nanotubes (5 mu m). These results are understood in terms of the decay and thermalization of nonequilibrium phonons, revealing the mechanism of thermal transport in these devices. The measurements also enable a direct estimate of thermal contact resistances and the spatial variation of thermal conductivity.

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页数：4

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