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Chemical sensor systems using xerogels and CMOS detectors

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4 Author(s)
Davenport, M. ; Electr. Eng., Univ. at Buffalo, NY, USA ; Titus, A.H. ; Tehan, E.C. ; Bright, F.V.

We have developed a chemical sensing platform based on xerogel thin film sensor elements coupled with CMOS detectors. We demonstrate the operation of the sensing platform as a simple oxygen sensor. The quenchometric operation of the oxygen sensor coupled with CMOS detectors is compared to standard laboratory detection systems (CCD and PMT). The Stern-Volmer quenching constant (kSV) is used as a comparative measure of the operation of each of these systems. In our initial experiments all three systems yielded a kSV between 0.042 and 0.049 O2%-1. The xerogel sensor elements have demonstrated satisfactory reusability and stability over a period of more than six months. The CMOS detectors consume less than 0.1% of the power required for the PMT or CCD detectors, and are an attractive platform for array processing and portable applications.

Published in:

Sensors, 2003. Proceedings of IEEE  (Volume:2 )

Date of Conference:

22-24 Oct. 2003