Facile Synthesis of Pt-Functionalized SnO2 Hollow Hemispheres and Their Gas Sensing Properties

Title
Facile Synthesis of Pt-Functionalized SnO2 Hollow Hemispheres and Their Gas Sensing Properties
Authors
조남규George C. Whitefield양대진김호기Harry L. Tuller김일두
Issue Date
2010-11
Publisher
Journal of the Electrochemical Society
Citation
VOL 157, NO 12, J435-J439
Abstract
This work presents a new route for enhancing the sensor response kinetics of macroporous SnO2 films. Well-ordered arrays of SnO2 hollow hemispheres, functionalized with catalytic Pt, were synthesized using colloidal templating and cosputtering, followed by subsequent heat-treatment. The diameter and shell thickness of the Pt-functionalized SnO2 hollow hemispheres were 800 and 25 nm, respectively. High resolution transmission electron microscopy analysis indicates that catalytic Pt nanoparticles, with size of a few nanometers, coat the top surface of SnO2 hemispheres, enabling chemical reactions to proceed at lower temperatures. Sensors composed of Pt-functionalized SnO2 hollow hemispheres show attractive gas sensing characteristics, such as reduced operation temperature (≤250°C) combined with improved sensitivity (R/Ro = 4.08 to 250 ppm H2), reduced baseline resistance, and enhanced response/recovery properties compared to sensors using pristine SnO2 hollow hemispheres at an operating temperature of 250°C.
URI
http://pubs.kist.re.kr/handle/201004/38648
ISSN
0013-4651
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KIST Publication > Article
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