Flame-spray-made metal-loaded semiconducting metal oxides thick films for flammable gas sensing

• Main Authors: Thanittha Samerjai, Nittaya Tamaekong, Khatcharin Wetchakun, Viruntachar Kruefu, Chaikarn Liewhiran, Chawarat Siriwong, Anurat Wisitsoraat, Sukon Phanichphat
• Format: Journal
• Published: 2018
• Subjects: Engineering; Materials Science; Physics and Astronomy
• Online Access: https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=84864288829&origin=inward; http://cmuir.cmu.ac.th/jspui/handle/6653943832/51611
• Institution: Chiang Mai University

Flame spray pyrolysis (FSP) presents a new technique for metal (Pt, Sn, Ru, Nb and W)-loaded metal oxide (MOX) nanoparticle synthesis, which requires only a single step. FSP prepared MOX nanoparticles have recently widely employed for gas-sensing applications. In this work, the performance towards flammable gases of unloaded and metal (Pt, Sn, Ru, Nb and W)-catalyzed metal oxide (ZnO, WO3, SnO2and TiO2) nanoparticle thick films fabricated by FSP and spin-coating is reviewed, discussed and compared to MOXs prepared by other methods. The gas-sensing characteristics towards H2, CH4, C2H2, C2H4, C2H5OH and CO gases of FSP-prepared MOXs are found to be significantly improved in terms of response, response time and selectivity with small Pt, Sn, Ru, Nb and W loading contents ranging from 0.2 to 5 mol% or at.%. In addition, Pt loading on WO3and ZnO sensors results in excellent detection performances towards several flammable gases including H2, CH4and C2H2. © 2012 Elsevier B.V. All rights reserved.