Highly selective hydrogen sensing of Pt-loaded WO<inf>3</inf>synthesized by hydrothermal/impregnation methods

• Main Authors: Thanittha Samerjai, Chaikarn Liewhiran, Anurat Wisitsoraat, Adisorn Tuantranont, Chanitpa Khanta, Sukon Phanichphant
• Format: Journal
• Published: 2018
• Online Access: https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=84897390972&origin=inward; http://cmuir.cmu.ac.th/jspui/handle/6653943832/45081
• Institution: Chiang Mai University

Unloaded and 0.25-1.0 wt% Pt-loaded WO 3 nanoparticles were synthesized by hydrothermal method using sodium tungstate dihydrate and sodium chloride as precursors in an acidic condition and impregnated using platinum acetylacetonate. Pt-loaded WO 3 films on an Al 2 O 3 substrate with interdigitated Au electrodes were prepared by spin-coating technique. The response of WO 3 sensors with different Pt-loading concentrations was tested towards 0.01-1.0 vol% of H 2 in air as a function of operating temperature (200-350 °C). The 1.0 wt% Pt-loaded WO 3 sensing film showed the highest response of ∼2.16 × 10 4 to 1.0 vol% H 2 at 250 °C. Therefore, an operating temperature of 250 °C was optimal for H 2 detection. The responses of 1.0 wt% Pt-loaded WO 3 sensing film to other flammable gases, including C 2 H 5 OH, C 2 H 4 and CO, were considerably less, demonstrating Pt-loaded WO 3 sensing film to be highly selective to H 2 . © 2014, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.