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Proceedings Paper

Agent-induced excess noise in commercial chemical sensors
Author(s): Jose L. Solis; Gary Seeton; Laszlo B. Kish
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Paper Abstract

The excess noise in commercial semiconductor gas sensors, during exposure to different gases at various temperatures, was studied. The measurements have been carried out using different concentrations of ethanol vapor, CO, NOx, H2 and SO2 gases in synthetic air. The normalized noise spectra of the sensors stabilize after the first day of the burning-in process in synthetic air. The sensors do not show significant deviation from the ohmic behavior over the full range of applied voltage. The induced excess noise is proportional to the square of the applied voltage, so resistance fluctuations explain the spectra. Each gas induces a characteristic noise spectrum. The analysis of resistance fluctuations in gas sensors, during exposure to gases, has the potential of a strongly enhanced sensitivity and selectivity.

Paper Details

Date Published: 8 May 2003
PDF: 7 pages
Proc. SPIE 5115, Noise and Information in Nanoelectronics, Sensors, and Standards, (8 May 2003); doi: 10.1117/12.497153
Show Author Affiliations
Jose L. Solis, Dept. of Electrical Engineering, Texas A&M Univ. (United States)
Gary Seeton, Dept. of Electrical Engineering, Texas A&M Univ. (United States)
Laszlo B. Kish, Dept. of Electrical Engineering, Texas A&M Univ. (United States)


Published in SPIE Proceedings Vol. 5115:
Noise and Information in Nanoelectronics, Sensors, and Standards
Laszlo B. Kish; Frederick Green; Giuseppe Iannaccone; John R. Vig, Editor(s)

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