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Thin Chal-AgI films as gas sensor

T. PETKOVA1, C. POPOV2, P. PETKOV3,* , B. MONCHEV1, Y. NEDEVA3

Affiliation

  1. Institute of Electrochemistry & Energy Systems, BAS, 1113 Sofia, Bulgaria
  2. University of Kassel (I M A), 40 Heinrich-Plett-Str., 34109 Kassel, Germany
  3. Department of Physics, University of Chemical Technology and Metallurgy, 8 “Kl. Ohridski” blvd., 1756 Sofia, Bulgaria

Abstract

Thin films of glassy (GeS2)1-x (AgI)x system have been studied. The films have been coated on cantilever-based gas sensors and studied upon exposure to water, acetone, and ammonia vapours. The results reveal that the sensor acted like a resonance microbalance, showing highest sensitivity towards the analyte with the highest molecular weight, i.e. towards acetone. Modification of the surface of the sensitive layer after the exposure to ammonia is associated with chemisorption of the analyte molecules on it and results in increase sensitivity towards water due to the chemisorbed NH3 molecules..

Keywords

Thin films, Chalcogenide application.

Submitted at: July 3, 2007
Accepted at: Oct. 15, 2007

Citation

T. PETKOVA, C. POPOV, P. PETKOV, B. MONCHEV, Y. NEDEVA, Thin Chal-AgI films as gas sensor, Journal of Optoelectronics and Advanced Materials Vol. 9, Iss. 10, pp. 3167-3170 (2007)