Abstract
The stability, sensitivity and selectivity of r.f. sputtered gold-doped tungsten trioxide (WO 3) films for gas-sensing applications have been examined. The WO 3 film sensing properties, such as electrical conductivity and carrier type, concentration and mobility, have been measured. It is found that in order to improve the WO 3 film stability, sensitivity and response time, it is necessary to subject the as-deposited films to a heat treatment or ‘activation’ process. This process enables concentrations of less than 1 part per billion (ppb) of hydrogen sulfide (H 2S) in air to be measured reproducibly. The films are exposed to several interferent gases and are found to be weakly sensitive only to hydrogen (H 2); however, this is not expected to be problematic in H 2S-sensing applications. The presenet work clearly shows that properly treated gold-doped WO 3 films are extremely stable, sensitive and selective to H 2S gas in the ppb range.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
