Dr. Tetsuya Kida Profile

Dr. Tetsuya Kida

at Kyushu Univ

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Proceedings Article | 16 September 2013 Paper

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

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

Proceedings Volume 8811, 881106 (2013) https://doi.org/10.1117/12.2026594

KEYWORDS: Chlorine, Carbon monoxide, Actinium, Resistance, Sensors, Tin, Ions, Oxygen, Nanomaterials, Gas sensors

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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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