Controlled Electrostatic Gating of Carbon Nanotube FET Devices
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- 作者：Alexander B. Artyukhin ; Michael Stadermann ; Raymond W. Friddle ; Pieter Stroeve ; Olgica Bakajin ; Aleksandr Noy
- 刊名：Nano Letters
- 出版年：2006
- 出版时间：September 2006
- 年：2006
- 卷：6
- 期：9
- 页码：2080 - 2085
- 全文大小：178K
- 年卷期：v.6,no.9(September 2006)
- ISSN：1530-6992
文摘
Carbon nanotube transistors are a promising platform for the next generation of nonoptical biosensors. However, the exact nature of thebiomolecule interactions with nanotubes in these devices remains unknown, creating one of the major obstacles to their practical use. Weassembled alternating layers of oppositely charged polyelectrolytes on the carbon nanotube transistors to mimic gating of these devices bycharged molecules. The devices showed reproducible oscillations of the transistor threshold voltage depending on the polarity of the outerpolymer layer in the multilayer film. This behavior shows excellent agreement with the predictions of a simple electrostatic model. Finally, wedemonstrate that complex interactions of adsorbed species with the device substrate and the surrounding electrolyte can produce significantand sometimes unexpected effects on the device characteristics.