Accession Number:

ADA574086

Title:

Improved Chemical Detection using Single-walled Carbon Nanotube Network Capacitors

Descriptive Note:

Journal article

Corporate Author:

NAVAL RESEARCH LAB WASHINGTON DC

Report Date:

2006-09-01

Pagination or Media Count:

7.0

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 1f 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.

Subject Categories:

  • Refractory Fibers

Distribution Statement:

APPROVED FOR PUBLIC RELEASE