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| Field emission microscopy study of the work function of single-walled carbon nanotubes |
| Zhang Zhaoxiang①; Sun Jianping①; Hou Shimin①; Zhao Xingyu①; Shi Zujin②; Gu Zhennan②; Liu Weimin①; Xue Zengquan① |
| ①Dept. of Electronics Peking University Beijing 100871 China;②College of Chemistry and Molecular Engineering Peking Univ., Beijing 100871 China |
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Abstract The work function Single-Walled Carbon NanoTubes (SWCNTs) is investigated using Field Emission Microscopy (FEM). Since electron states of absorbed atoms and molecules dominate field emission from SWCNTs at room temperature, any measure prior to desorption could not obtain the work function of clean SWCNTs. So field emission patterns of clean SWCNTs are firstly achieved after SWCNTs are treated at high temperatures, then I-V behaviors of clean SWCNTs are measured. The radius of the bundle SWCNTs is known from its image of Transmission Electron Microscopy (TEM) so that the ratio factor β could be calculated using 3 different formulas, hence the work function of clean SWCNTs is determined from the slope of Fowler-Nordheim plot.
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Received: 07 March 2001
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2002, Vol. 24 
