H2O/D2O exchange in the presence of CO over SnO2 nanomaterials: operando DRIFTS and resistance study for gas sensor applications

R. G. Pavelko; J.-K. Choi; A. Urakawa; M. Yuasa; T. Kida; K. Shimanoe; N. Yamazoe

doi:10.1117/12.2026594

16 September 2013 H₂O/D₂O exchange in the presence of CO over SnO₂ nanomaterials: operando DRIFTS and resistance study for gas sensor applications

R. G. Pavelko, J.-K. Choi, A. Urakawa, M. Yuasa, T. Kida, K. Shimanoe, N. Yamazoe

Author Affiliations +

Proceedings Volume 8811, Physical Chemistry of Interfaces and Nanomaterials XII; 881106 (2013) https://doi.org/10.1117/12.2026594
Event: SPIE NanoScience + Engineering, 2013, San Diego, California, United States

Abstract

Modulation excitation diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS) together with resistance measurements has been carried out to study water isotopic exchange on undoped SnO₂ materials as a function of CO concentration. We compare two materials synthesized via hydrothermal treatment and different only in their precursors: SnO₂ Ac synthesized from tin(IV) hydroxide acetate and SnO₂ Cl from tin(IV) chloride pentahydrate. DRIFTS and resistance measurements were performed simultaneously in an environmental chamber at 300 oC and in a flow of humid air. The annealed materials were found to have similar particle sizes (16±7 nm), crystallite sizes (12±2 nm) and pore size distribution (9±1 nm). However, sensor tests showed notably higher responses to CO in the presence of water vapor for SnO₂ Ac. Electronic effect of CO chemisorption quantitatively correlates with consumption of bridging hydroxyls on the latter surface upon increasing concentration of CO from 0 to 500 ppm in humid air. No such correlation was found for SnO₂ Cl. Water desorption kinetics was found to be slower for the latter by ca. 30 % with respect to SnO₂ Ac. Low activity of surface OH groups and consequently low sensor signals of SnO₂ Cl were proposed to originate from traces of Cl ions found in the material after the synthesis despite negative Cl test before the hydrothermal treatment.

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R. G. Pavelko, J.-K. Choi, A. Urakawa, M. Yuasa, T. Kida, K. Shimanoe, and N. Yamazoe "H₂O/D₂O exchange in the presence of CO over SnO₂ nanomaterials: operando DRIFTS and resistance study for gas sensor applications", Proc. SPIE 8811, Physical Chemistry of Interfaces and Nanomaterials XII, 881106 (16 September 2013); https://doi.org/10.1117/12.2026594

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