Electronic Properties of Single-Walled Carbon Nanotube Networks

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• 作者：Elena Bekyarova ; Mikhail E. Itkis ; Nelson Cabrera ; Bin Zhao ; Aiping Yu ; Junbo Gao ; and Robert C. Haddon
• 刊名：Journal of the American Chemical Society
• 出版年：2005
• 出版时间：April 27, 2005
• 年：2005
• 卷：127
• 期：16
• 页码：5990 - 5995
• 全文大小：435K
• 年卷期：v.127,no.16(April 27, 2005)
• ISSN：1520-5126

文摘

We present a study on the electronic behavior of films of as-prepared and purified single-walledcarbon nanotubes (SWNTs) and demonstrate the important role that chemical functionalization plays inmodifying their electronic properties, which in turn throws further light on the mechanism of action of SWNT-based sensors. Films of electric arc SWNTs were prepared by spraying, and optical spectroscopy wasused to measure the effective film thickness. The room-temperature conductivities (_RT) of thin films depositedfrom as-prepared and purified SWNTs are in the range _RT = 250-400 S/cm, and the nonmetallictemperature dependence of the conductivity indicates the presence of tunneling barriers, which dominatethe film conductivity. Chemical functionalization of SWNTs with octadecylamine (ODA) and poly(m-aminobenzenesulfonic acid) (PABS) significantly decreases the conductivity; _RT = 3 and 0.3 S/cm forSWNT-ODA and SWNT-PABS, respectively.