Structure and chemistry of surface-doped Pt:SnO2 gas sensing materials

David Degler; Hudson W. Pereira de Carvalho; Kristina Kvashnina; Jan-Dierk Grunwaldt; Udo Weimar; Nicolae Barsan

doi:10.1039/C5RA26302F

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Structure and chemistry of surface-doped Pt:SnO₂ gas sensing materials†

David Degler,^a Hudson W. Pereira de Carvalho,^bc Kristina Kvashnina,^de Jan-Dierk Grunwaldt,^b Udo Weimar^a and Nicolae Barsan*^a

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* Corresponding authors

^a University of Tübingen, Institute of Physical and Theoretical Chemistry, Auf der Morgenstelle 15, 72076 Tübingen, Germany
E-mail: nb@ipc.uni-tuebingen.de
Tel: +49 7071 29 78761

^b Karlsruhe Institute of Technology, Institute for Chemical Technology and Polymer Chemistry, Engesserstr. 20, 76131 Karlsruhe, Germany

^c Centro de Energia Nuclear na Agricultura, Universidade de São Paulo, P. O. Box 96, Piracicaba, SP, Brazil

^d ESRF, BP220, 6 rue Jules Horowitz, 38043 Grenoble, France

^e Helmholtz-Zentrum Dresden-Rossendorf (HZDR), Institute of Resource Ecology, P. O. Box 510119, Dresden, Germany

Abstract

Surface-doped Pt:SnO₂ was synthesized by impregnation of calcined SnO₂ made by an aqueous sol–gel route. The structure of the introduced Pt-dopant and its behaviour during gas exposure were examined by in situ and operando X-ray absorption spectroscopy. The results reveal that Pt forms a nano-sized PtO₂ phase, which was not found for bulk and surface doped materials, studied previously. In a comparative investigation of undoped and Pt-doped SnO₂ gas sensors the performance and the surface chemistry were investigated, the latter one using operando FT-IR spectroscopy. The results prove the strong influence of the different Pt structures on the surface chemistry of SnO₂, providing the basis for an understanding on the varying sensor performance of differently synthesized Pt:SnO₂ gas sensing materials.

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Article information

DOI: https://doi.org/10.1039/C5RA26302F
Article type: Paper
Submitted: 09 Dec 2015
Accepted: 07 Mar 2016
First published: 11 Mar 2016
This article is Open Access

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RSC Adv., 2016,6, 28149-28155

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Structure and chemistry of surface-doped Pt:SnO₂ gas sensing materials

D. Degler, H. W. Pereira de Carvalho, K. Kvashnina, J. Grunwaldt, U. Weimar and N. Barsan, RSC Adv., 2016, 6, 28149 DOI: 10.1039/C5RA26302F

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