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dc.contributor.authorC. Liewhiranen_US
dc.contributor.authorN. Tamaekongen_US
dc.contributor.authorA. Wisitsoraaten_US
dc.contributor.authorA. Tuantranonten_US
dc.contributor.authorS. Phanichphanten_US
dc.description.abstractIn this paper, ultra-sensitive hydrogen (H2+) gas sensors based on flame-spray-made Pd-catalyzed SnO2+nanoparticles is presented. Pd-loaded SnO2+crystalline nanoparticles with high specific surface area and well-controlled size were synthesized by flame spray pyrolysis (FSP) in one step. The particle properties were characterized by XRD, BET, SEM, TEM and EDS analyses. The H2+-sensing performances in terms of sensor response, response time and selectivity were optimized by varying Pd concentration between 0.2 and 2 wt%. An optimal Pd concentration for H2+sensing was found to be 0.2 wt%. The optimal sensing film (0.2 wt% Pd/SnO2+, 10μm in thickness) showed an ultra-high sensor response of ∼104to 1 vol% of H2+at 200°C and very short response time within a few seconds. Moreover, the optimum sensing temperature of Pd-loaded SnO2+films was shifted to a lower value compared with that of unloaded SnO2+film. The significant enhancement of H2+sensing performances was attributed to highly effective spillover mechanism of well-dispersed Pd catalyst in SnO2+matrix at low Pd-loading concentration. Furthermore, the catalyst selectivity of Pd toward H2+was found to be significantly higher than those of two other noble metals including Pt and Ru, respectively. Therefore, the flame-made 0.2 wt% Pd/SnO2+sensors is one of the most promising candidates for highly sensitive and selective detection of H2+. © 2012 Elsevier B.V. All rights reserved.en_US
dc.subjectMaterials Scienceen_US
dc.subjectPhysics and Astronomyen_US
dc.titleUltra-sensitive H<inf>2+</inf>sensors based on flame-spray-made Pd-loaded SnO<inf>2+</inf>sensing filmsen_US
article.title.sourcetitleSensors and Actuators, B: Chemicalen_US
article.volume176en_US Mai Universityen_US Universityen_US National Electronics and Computer Technology Centeren_US
Appears in Collections:CMUL: Journal Articles

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