Conversion of pristine and p-doped sulfuric-acid-treated single-walled carbon nanotubes to n-type materials by a facile hydrazine vapor exposure process

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• 作者：Pen-Cheng Wang^a ; ^{wangpc@ess.nthu.edu.tw} ; Yu-Chun Liao^a ; ^b ; Yu-Ling Lai^b ; Ying-Chang Lin^b ; Ching-Yuan Su^a ; Chuen-Horng Tsai^a ; Yao-Jane Hsu^b ; ^{yjhsu@nsrrc.org.tw}
• 关键词：Electronic materials ; Chemical techniques ; X-ray photo-emission spectroscopy (XPS) ; Chemisorption
• 刊名：Materials Chemistry and Physics
• 出版年：2012
• 期刊代码：58_02540584
• 类别：ms
• 出版时间：15 May, 2012
• 卷：134
• 期：1
• 页码：325-332
• 文件大小：926 K

摘要

It was found in this study that a facile vapor-phase hydrazine (N₂H₄) treatment could effectively convert pristine and even p-doped sulfuric-acid-treated single-walled cabon nanotubes (SWCNTs) to n-type materials. The Raman spectroscopy results show that the facile vapor-phase hydrazine treatment could suppress the intensity of SWCNTs鈥?radial breathing modes and alter SWCNTs鈥?D-band vs. G-band intensity ratio. The sheet resistance measurement results show that the n-doping effect exerted by the vapor-phase hydrazine treatment could overwhelmingly counteract sulfuric acid's p-doping effect and subdue the SWCNTs鈥?acquired p-type characteristics rendered by the sulfuric acid treatment. The ultraviolet photoelectron spectroscopy and X-ray photoelectron spectroscopy results suggest that certain reactive nitrogen-containing radicals thermally decomposed from hydrazine, such as nitrene and amidogen, could covalently functionalize CNTs and then n-dope the functionalzed CNTs.