Flame-made Pt-loaded TiO2 thin films and their application as H2 gas sensors

• Main Authors: Weerasak Chomkitichai, Hathaithip Ninsonthi, Chaikarn Liewhiran, Anurat Wisitsoraat, Saengrawee Sriwichai, Sukon Phanichphant
• Format: Journal
• Published: 2018
• Online Access: https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=84893859864&origin=inward; http://cmuir.cmu.ac.th/jspui/handle/6653943832/47431
• Institution: Chiang Mai University

The hydrogen gas sensors were developed successfully using flame-made platinum-loaded titanium dioxide (Pt-loaded TiO 2 ) nanoparticles as the sensing materials. Pt-loaded TiO 2 thin films were prepared by spin-coating technique onto Al 2 O 3 substrates interdigitated with Au electrodes. Structural and gas-sensing characteristics were examined by using scanning electron microscopy (SEM) and showed surface morphology of the deposited film. X-ray diffraction (XRD) patterns can be confirmed to be the anatase and rutile phases of TiO 2 . High-resolution transmission electron microscopy (HRTEM) showed that Pt nanoparticles deposited on larger TiO 2 nanoparticles. TiO 2 films loaded with Pt nanoparticles were used as conductometric sensors for the detection of H 2 . The gas sensing of H 2 was studied at the operating temperatures of 300, 350, and 400°C in dry air. It was found that 2.00 mol% Pt-loaded TiO 2 sensing films showed higher response towards H 2 gas than the unloaded film. In addition, the responses of Pt-loaded TiO 2 films at all operating temperatures were higher than that of unloaded TiO 2 film. The response increased and the response time decreased with increasing of H 2 concentrations. © 2013 Weerasak Chomkitichai et al.