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Chemical identification using an impedance sensor based on dispersive charge transport
- Source :
- Applied Physics Letters. 88:074104
- Publication Year :
- 2006
- Publisher :
- AIP Publishing, 2006.
-
Abstract
- 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 5kHz 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.
Details
- ISSN :
- 10773118 and 00036951
- Volume :
- 88
- Database :
- OpenAIRE
- Journal :
- Applied Physics Letters
- Accession number :
- edsair.doi...........4c6d5f4a8b3374c39ee23a59419051ce