Chemical identification using an impedance sensor basedon dispersive charge transport

Impedance spectroscopy has been used to identify analytes in semiconducting metallophthalocyanine thin films. Above a critical concentration, the magnitudes of the high frequency conductivity changes are invariant with concentration but distinct for different analytes and can be used for analyte ide...

Full description

Saved in:
Bibliographic Details
Published in:Applied physics letters 2006-02, Vol.88 (7), p.074104-074104-3
Main Authors: Yang, Richard D., Fruhberger, Bernd, Park, Jeongwon, Kummel, Andrew C.
Format: Article
Language:
Citations: Items that this one cites
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Impedance spectroscopy has been used to identify analytes in semiconducting metallophthalocyanine thin films. Above a critical concentration, the magnitudes of the high frequency conductivity changes are invariant with concentration but distinct for different analytes and can be used for analyte identification. The analyte-induced ac conductivity changes above 5 kHz have been converted to frequency shifts in a circuit resonance and used to differentiate methanol, ethanol, and isopropanol vapors in a nitrogen carrier gas. The analyte-induced changes in the conductivity are consistent with analyte-induced changes in the charge relaxation times.
ISSN:0003-6951
1077-3118
DOI:10.1063/1.2175491