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Role of oxygen in high temperature hydrogen sulfide detection using MISiC sensors

Lookup NU author(s): Dr Ming-Hung Weng, Dr Rajat Mahapatra, Professor Nick Wright, Dr Alton Horsfall


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This paper reports on the sensitivity of a MISiC capacitor sensor with a catalytic top contact to gas mixtures, including hydrogen sulfide, at temperatures in excess of 300 °C. The gas concentration may be extracted from the change in leakage current through the capacitor and exposure to H 2S gives a response similar to that observed in hydrogen. This indicates that the decomposition of the H2S on the catalytic contact is forming atomic hydrogen, which forms a dipole layer at the dielectric/SiO2 interface. Exposure to oxygen and H2S simultaneously gives a larger hydrogen-like response, which is contrary to that observed when hydrogen and oxygen are mixed. We suggest that this response is related to the influence of the choice of dielectric used to fabricate the capacitor structure, offering the opportunity to develop array technology for unique identification of gas species in a mixture. © 2008 IOP Publishing Ltd.

Publication metadata

Author(s): Weng MH, Mahapatra R, Wright NG, Horsfall AB

Publication type: Article

Publication status: Published

Journal: Measurement Science and Technology

Year: 2008

Volume: 19

Issue: 2

ISSN (print): 0957-0233

ISSN (electronic): 1361-6501

Publisher: Institute of Physics Publishing Ltd.


DOI: 10.1088/0957-0233/19/2/024002

Notes: Article no. 024002


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