期刊
JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
卷 71, 期 4, 页码 476-479出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.jpcs.2009.12.015
关键词
Carbon nanotubes; Single-stranded DNA; Field effect transistor
Arrays of chemical sensors based on homo-oligomer single-stranded DNA (ssDNA) adsorbed to single-walled carbon nanotube field effect transistors (SWNT-FETs) were employed to detect several gaseous analytes. Exposure of these devices to analytes results in a characteristic current shift in the SWNT-FET. The magnitude of this current shift for a particular analyte varies with the base sequence of adsorbed ssDNA and follows the trend d(G)(21)-SWNT > d(A)(21)-SWNT > d(C)(21)-SWNT > d(T)(21)-SWNT. Molecular dynamics simulations suggest that a comparable trend of d(G)(21) > d(A)(21) > d(T)(21)- > d(C)(21) exists for ssDNA-SWNT binding affinities. This indicates that the nature of ssDNA-SWNT binding plays a vital role in the performance of the sensor. Stronger binding implies a greater amount of ssDNA adsorbed to SWNT surface. This would result in a more hydrophilic environment around the hydrophobic SWNT core and thus facilitate the adsorption of polar analytes. (C) 2009 Elsevier Ltd. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据