Abstract Light emission from a suspended multiwall carbon nanotube (MWCNT) on application of electric current was studied by in-situ transmission electron microscopy combined with optical spectroscopy. Excessive Joule heating led to layer-by-layer sublimation of the outer and/or inner shells of the MWCNT. The temperature during sublimation was estimated to be more than 2100 K from the sublimation rate of the MWCNT. Light emission spectra observed while applying an electric current to the MWCNT were composed of blackbody radiation and characteristic peaks. The energies of the peaks in the spectra were close to energy gaps between van Hove singularities calculated from the diameters of the constituent shells of the MWCNT, suggesting that the peaks in the spectra can be attributed to interband transitions between van Hove singularities in the electronic density of states in the MWCNT.

中文翻译：

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悬浮多壁碳纳米管在电流作用下的发光和结构变化

摘要 采用原位透射电子显微镜结合光谱学研究了悬浮多壁碳纳米管（MWCNT）在电流作用下的光发射。过度的焦耳加热导致 MWCNT 的外壳和/或内壳逐层升华。从 MWCNT 的升华速率估计升华过程中的温度超过 2100 K。在向 MWCNT 施加电流时观察到的发光光谱由黑体辐射和特征峰组成。光谱中峰值的能量接近范霍夫奇点之间的能隙，该奇点由多壁碳纳米管的组成壳的直径计算，