The testing of a semiconductor-based adsorption modified photosensitive sensor for its response to a volatile organic compound, oxygen, humidity and temperature

Document Type

Conference Proceeding

Publication Date

5-27-2005

Abstract

A thin-film sensor, composed of a cadmium sulfide layer coated with rhodamine B fluorescent dye on a glass substrate, was tested for changes in photoconductivity due to exposure to different atmospheres. Two different thicknesses (approximately 0.5 and 4.5 μm) of CdS were tested with concentrations of gaseous toluene in the parts-per-million (ppm) range as well as with various mixtures including different concentrations of oxygen, nitrogen, and humidity. The effect of temperature was also explored. Both sensors were able to detect toluene concentrations in the parts-per-million range in the absence of oxygen. Both sensors were also useful in detecting the concentration of oxygen. The thicker sensor had a greater photoelectric response than the thinner sensor, and was able to detect toluene in the 1-30 ppm concentration range in air at room temperature. © 2004 Elsevier B.V. All rights reserved.

Identifier

18544379311 (Scopus)

Publication Title

Sensors and Actuators B Chemical

External Full Text Location

https://doi.org/10.1016/j.snb.2004.10.026

ISSN

09254005

First Page

347

Last Page

352

Issue

1 SPEC. ISS.

Volume

107

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