Improved chemical detection using single-walled carbon nanotube network capacitors

Joshua Alexander Robinson, E. S. Snow, F. K. Perkins

Research output: Contribution to journalArticle

44 Citations (Scopus)

Abstract

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

Original languageEnglish (US)
Pages (from-to)309-314
Number of pages6
JournalSensors and Actuators, A: Physical
Volume135
Issue number2
DOIs
StatePublished - Apr 15 2007

Fingerprint

Chemical detection
chemical detection
Single-walled carbon nanotubes (SWCN)
capacitors
Capacitors
Capacitance
carbon nanotubes
Chemical Warfare Agents
Chemical warfare
capacitance
Recovery
Sensors
Vapor pressure
recovery
chemical warfare
Signal to noise ratio
Vapors
sensors
vapor pressure
dynamic range

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Instrumentation
  • Condensed Matter Physics
  • Surfaces, Coatings and Films
  • Metals and Alloys
  • Electrical and Electronic Engineering

Cite this

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Improved chemical detection using single-walled carbon nanotube network capacitors. / Robinson, Joshua Alexander; Snow, E. S.; Perkins, F. K.

In: Sensors and Actuators, A: Physical, Vol. 135, No. 2, 15.04.2007, p. 309-314.

Research output: Contribution to journalArticle

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