Photoinduced Charge Transfer and Acetone Sensitivity of Single-Walled Carbon Nanotube鈥揟itanium Dioxide Hybrids

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• 作者：Mengning Ding ; Dan C. Sorescu ; Alexander Star
• 刊名：The Journal of the American Chemical Society
• 出版年：2013
• 出版时间：June 19, 2013
• 年：2013
• 卷：135
• 期：24
• 页码：9015-9022
• 全文大小：624K
• 年卷期：v.135,no.24(June 19, 2013)
• ISSN：1520-5126

文摘

The unique physical and chemical properties of single-walled carbon nanotubes (SWNTs) make them ideal building blocks for the construction of hybrid nanostructures. In addition to increasing the material complexity and functionality, SWNTs can probe the interfacial processes in the hybrid system. In this work, SWNT鈥揟iO₂ core/shell hybrid nanostructures were found to exhibit unique electrical behavior in response to UV illumination and acetone vapors. By experimental and theoretical studies of UV and acetone sensitivities of different SWNT鈥揟iO₂ hybrid systems, we established a fundamental understanding on the interfacial charge transfer between photoexcited TiO₂ and SWNTs as well as the mechanism of acetone sensing. We further demonstrated a practical application of photoinduced acetone sensitivity by fabricating a microsized room temperature acetone sensor that showed fast, linear, and reversible detection of acetone vapors with concentrations in few parts per million range.