Highly selective hydrogen sensing of Pt-loaded WO3 synthesized by hydrothermal/impregnation methods

• Main Authors: Samerjai T., Liewhiran C., Wisitsoraat A., Tuantranont A., Khanta C., Phanichphant S.
• Format: Conference or Workshop Item
• Language: English
• Published: Elsevier Ltd 2014
• Online Access: http://www.scopus.com/inward/record.url?eid=2-s2.0-84897390972&partnerID=40&md5=64a020c7592086751f60348c83bda006; http://cmuir.cmu.ac.th/handle/6653943832/4739
• Institution: Chiang Mai University

Unloaded and 0.25-1.0 wt% Pt-loaded WO3 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 WO3 films on an Al2O 3 substrate with interdigitated Au electrodes were prepared by spin-coating technique. The response of WO3 sensors with different Pt-loading concentrations was tested towards 0.01-1.0 vol% of H2 in air as a function of operating temperature (200-350 °C). The 1.0 wt% Pt-loaded WO3 sensing film showed the highest response of ∼2.16 × 104 to 1.0 vol% H2 at 250 °C. Therefore, an operating temperature of 250 °C was optimal for H2 detection. The responses of 1.0 wt% Pt-loaded WO3 sensing film to other flammable gases, including C2H5OH, C2H4 and CO, were considerably less, demonstrating Pt-loaded WO3 sensing film to be highly selective to H2. © 2014, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.