Role of vanadium oxide and palladium multiple loading on the sensitivity and recovery kinetics of tin dioxide based gas sensors. Issue 7 (12th January 2016)

• Record Type: Journal Article
• Authors: Suematsu, Koichi; Kodama, Kazuya; Ma, Nan; Yuasa, Masayoshi; Kida, Tetsuya; Shimanoe, Kengo
• Is Part Of: RSC advances. Volume 6:Issue 7(2016)
• Page Start: 5169
• Page End: 5176
• Publication Date: 2016-01-12
• Subjects: Chemistry -- Periodicals; 540.5
• DOI: 10.1039/c5ra20994c
• Languages: English
• ISSNs: 2046-2069

Abstract

Abstract : Improving the gas sensing properties by Pd and V2 O5 co-loading on the SnO2 attributed to the role of each additive. Abstract : The simultaneous improvement of sensor response and response/recovery kinetics is important for repeated gas monitoring using high-performance semiconductor gas sensors. In this study, we attempted to add two different types of catalysts to the SnO2 nanoparticles to enhance their responsive properties and investigated the impact of each catalyst on co-loaded SnO2 nanoparticles. V2 O5 and Pd were loaded on sphere-type SnO2 nanoparticles by a simple impregnation method, and we evaluated the effect on the sensor response to H2 and recovery speed. Separately, V2 O5 and Pd loading effectively enhance the sensor response and rapid recovery reaction, respectively, because V2 O5 provides SnO2 with reactive adsorbed oxygen, and Pd enhances the catalytic activity on the particle surface. Further, V2 O5 - and Pd-co-loaded SnO2 shows both high sensor response and rapid recovery reaction. Thus, co-loaded SnO2 is improved by V2 O5 and Pd simultaneously, and the two loadings are complementary. In particular, V2 O5 loading reduces the recovery speed due to the re-oxidization of V2 O5 on SnO2 . However, Pd accelerates V2 O5 re-oxidization by catalytic activity and the recovery kinetics of the co-loaded SnO2 . Therefore, this fundamental investigation offers a suitable material design for additives, which can be applied to manufacture high-performance electrochemical devices such as semiconductor gas sensors.