Improved chemical detection using single-walled carbon nanotube network capacitors

被引:50
|
作者
Robinson, J. A. [1 ]
Snow, E. S. [1 ]
Perkins, F. K. [1 ]
机构
[1] USN, Res Lab, Washington, DC 20375 USA
关键词
single-walled carbon nanotube; chemical detection; sensor; capacitance; SENSORS; GAS; TRANSISTORS; ADSORPTION;
D O I
10.1016/j.sna.2006.07.027
中图分类号
TM [电工技术]; TN [电子技术、通信技术];
学科分类号
0808 ; 0809 ;
摘要
We explore capacitance- and conductance-based detection of trace chemical vapors using single-walled carbon nanotubes (SWNTs). We find that Conductance detection is susceptible to such problems as large 1/f noise and incomplete sensor recovery, which are primarily artifacts of a charge-based transduction mechanism. Capacitance detection, dominated by dielectric effects, is less sensitive to charge effects and, thus, offers increased signal-to-noise ratio, improved sensor recovery, and larger dynamic range. Our data indicate capacitance-based sensing with SWNTs is well suited for trace-level detection of such low-vapor-pressure materials as certain chemical warfare agents and explosives. Crown Copyright (c) 2006 Published by Elsevier B.V. All rights reserved.
引用
收藏
页码:309 / 314
页数:6
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