The thermal contact resistance is a difficult problem that has puzzled many researchers in measuring the intrinsic thermal conductivity of an individual carbon nanotube (CNT). To avoid this problem, a non-contact Raman spectra shift method is introduced, by which we have successfully measured the thermal conductivity (K) of an individual single-walled carbon nanotube and a multi-walled carbon nanotube. The measured K values are 2400 W m~(-1) K~(-1) and 1400 W m~(-1) K~(-1), respectively. The CNT was suspended over a trench and heated by electricity. The temperature difference between the middle and the two ends of the CNT indicated its intrinsic heat transfer capability. The temperature difference was determined by the temperature-induced shifts of its G band Raman spectra. This new method can eliminate the impact of the thermal contact resistance which was a Gordian knot in many previous measurements.
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机译：热接触电阻是一个难题，许多研究人员在测量单个碳纳米管（CNT）的固有热导率时感到困惑。为了避免这个问题，引入了非接触拉曼光谱位移法，通过该方法我们成功地测量了单个单壁碳纳米管和多壁碳纳米管的热导率（K）。测得的K值分别为2400 W m〜（-1）K〜（-1）和1400 W m〜（-1）K〜（-1）。 CNT悬浮在沟槽上并通过电加热。 CNT的中部和两端之间的温差表明其固有的传热能力。温度差是由温度引起的其G波段拉曼光谱的位移确定的。这种新方法可以消除热接触电阻的影响，而在以前的许多测量中，热接触电阻是高地结。
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