Web Release Date: December 18,
Self-Clusterized Glycines on Single-Walled Carbon Nanotubes for Alcohol Sensing
and
Department of Chemistry, Pohang University of Science and Technology, San 31, Hyoja-Dong, Nam-Gu, Pohang, Korea 790-784, School of Physics and NANO Systems Institute, Seoul National University, Seoul, Korea 151-747, and Department of Physics and Applied Physics, University of Massachusetts, Lowell, Massachusetts 01854
Received: September 2, 2007
In Final Form: October 16, 2007
Abstract:
Glycines are spontaneously adsorbed to form into self-assembled nanoclutsers on single-walled carbon nanotubes (SWNTs). After formation of glycine nanoclusters on SWNTs, the field effect transistor (FET) devices show selective sensing ability to alcohols, such as isopropyl alcohol (IPA), methanol, and ethanol. Upon the adsorption of alcohol, the glycine-coated SWNT-FET devices exhibit pseudo-metallic transport behaviors, whereas the original and glycine-coated devices display conventional p-type transport characteristics. Computational studies support that the gate field screening effect induced by instantly formed glycine-alcohol pair layers seems to be responsible for the pseudo-metallic transport behavior.
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