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

Authors
Cho, Nam GyuWhitfield, George C.Yang, Dae JinKim, Ho-GiTuller, Harry L.Kim, Il-Doo
Issue Date
2010-11
Publisher
ELECTROCHEMICAL SOC INC
Citation
JOURNAL OF THE ELECTROCHEMICAL SOCIETY, v.157, no.12, pp.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 degrees C) combined with improved sensitivity (R/R-o = 4.08 to 250 ppm H-2), reduced baseline resistance, and enhanced response/recovery properties compared to sensors using pristine SnO2 hollow hemispheres at an operating temperature of 250 degrees C. (C) 2010 The Electrochemical Society. [DOI: 10.1149/1.3489949] All rights reserved.
Keywords
CHEMICAL-MODIFICATION; OXIDE FILMS; THIN-FILMS; SENSORS; SURFACE; NANOSTRUCTURES; SENSITIVITY; XPS; CHEMICAL-MODIFICATION; OXIDE FILMS; THIN-FILMS; SENSORS; SURFACE; NANOSTRUCTURES; SENSITIVITY; XPS
ISSN
0013-4651
URI
https://pubs.kist.re.kr/handle/201004/130953
DOI
10.1149/1.3489949
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KIST Article > 2010
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