Efficient Transfer Doping of Carbon Nanotube Forests by MoO3

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• 作者：Santiago Esconjauregui ; Lorenzo D鈥橝rsi茅 ; Yuzheng Guo ; Junwei Yang ; Hisashi Sugime ; Sabina Caneva ; Cinzia Cepek ; John Robertson
• 刊名：ACS Nano
• 出版年：2015
• 出版时间：October 27, 2015
• 年：2015
• 卷：9
• 期：10
• 页码：10422-10430
• 全文大小：642K
• ISSN：1936-086X

文摘

We dope nanotube forests using evaporated MoO₃ and observe the forest resistivity to decrease by 2 orders of magnitude, reaching values as low as 鈭? 脳 10^鈥? 惟cm, thus approaching that of copper. Using in situ photoemission spectroscopy, we determine the minimum necessary MoO₃ thickness to dope a forest and study the underlying doping mechanism. Homogenous coating and tube compaction emerge as key factors for decreasing the forest resistivity. When all nanotubes are fully coated with MoO₃ and packed, conduction channels are created both inside the nanotubes and on the outside oxide layer. This is supported by density functional theory calculations, which show a shift of the Fermi energy of the nanotubes and the conversion of the oxide into a layer of metallic character. MoO₃ doping removes the need for chirality control during nanotube growth and represents a step forward toward the use of forests in next-generation electronics and in power cables or conductive polymers.