Abstract
Nanocrystalline WO3 films were produced by advanced reactive gas deposition onto alumina substrates. The as‐deposited films had a tetragonal crystal structure and a mean grain size of around 6 nm, as found by X‐ray diffraction and electron microscopy. Sintering at a temperature τs > 770 K yielded monoclinic films. We investigated the gas‐sensing properties of films sintered up to 870 K. After an initial “activation” at τs= 750 K, the nanocrystalline WO3 films showed excellent gas‐sensing properties, even at room temperature, on exposure to low concentrations of H2S in air. As little as 10 ppm of H2S made the conductance increase by a factor of about 103 within 10 min. The initial properties could be restored by heating the films to 530 K for 1 min.
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.
