Facile Synthesis of Pt-Functionalized SnO2 Hollow Hemispheres and Their Gas Sensing Properties
- Facile Synthesis of Pt-Functionalized SnO2 Hollow Hemispheres and Their Gas Sensing Properties
- 조남규; George C. Whitefield; 양대진; 김호기; Harry L. Tuller; 김일두
- Issue Date
- Journal of the Electrochemical Society
- VOL 157, NO 12, J435-J439
- 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
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