Ultra-sensitive H<inf>2</inf>S sensors based on hydrothermal/impregnation-made Ru-functionalized WO<inf>3</inf>nanorods

• Main Authors: Viruntachar Kruefu, A. Wisitsoraat, A. Tuantranont, S. Phanichphant
• Format: Journal
• Published: 2018
• Subjects: Agricultural and Biological Sciences
• Online Access: https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=84937764837&origin=inward; http://cmuir.cmu.ac.th/jspui/handle/6653943832/44356
• Institution: Chiang Mai University

© 2015 Elsevier B.V. All rights reserved. Ultra-sensitive H 2 S gas sensors based on the hydrothermal/impregnation-synthesized WO 3 one-dimensional (1D) nanostructures functionalized with Ru are presented. The particle properties were characterized by XRD, BET, SEM, TEM and EDS analyses. The H 2 S-sensing performances in terms of sensor response, response/recovery times and selectivity were optimized by varying Ru concentration. The optimal sensing film (0.50 wt% Ru-WO 3 ) showed an ultra-high sensor response of ∼192 and short response time of ∼0.8 s to 10 ppm of H 2 S at 350 C. In addition, 0.50 wt% Ru-WO 3 nanorods (NRs) exhibited much higher H 2 S selectivity against NO 2 , SO 2 , C 2 H 5 OH and NH 3 compared with unloaded WO 3 NRs. Furthermore, the catalyst selectivity of Ru toward H 2 S was found to be significantly higher than those of three other metals including Ni, Nb and A u, respectively. Therefore, 0.50 wt% Ru-WO 3 sensor is one of the most promising candidates for highly sensitive and selective detection of H 2 S.