期刊
SENSORS AND ACTUATORS A-PHYSICAL
卷 135, 期 2, 页码 309-314出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.sna.2006.07.027
关键词
single-walled carbon nanotube; chemical detection; sensor; capacitance
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.
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