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

来源：

SENSORS AND ACTUATORS A-PHYSICAL | 2007年 / 135卷 / 02期

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

页码：309 / 314

页数：6

共 19 条

[1] Chemically functionalized single-walled carbon nanotubes as ammonia sensors [J].