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Nano Research

Article Title

Contrasting room-temperature hydrogen sensing capabilities of Pt-SnO2 and Pt-TiO2 composite nanoceramics

Authors

Yao Xiong, School of Physics and Technology, Wuhan University, Wuhan 430072, China
Wanping Chen, School of Physics and Technology, Wuhan University, Wuhan 430072, China
Yesheng Li, School of Materials Science and Engineering, State Key Laboratory of New Ceramics and Fine Processing, Tsinghua University, Beijing 100084, China
Ping Cui, International Center for Quantum Design of Functional Materials (ICQD), Hefei Laboratory for Physical Sciences at Microscale (HFNL), and Synergetic Innovation Center of National Quantum Information and Quantum Physics, University of Science and Technology of China, Hefei 230026, China
Shishang Guo, School of Physics and Technology, Wuhan University, Wuhan 430072, China
Wei Chen, International Center for Quantum Design of Functional Materials (ICQD), Hefei Laboratory for Physical Sciences at Microscale (HFNL), and Synergetic Innovation Center of National Quantum Information and Quantum Physics, University of Science and Technology of China, Hefei 230026, China
Zilong Tang, School of Materials Science and Engineering, State Key Laboratory of New Ceramics and Fine Processing, Tsinghua University, Beijing 100084, China
Zijie Yan, Department of Chemical and Biomolecular Engineering, Clarkson University, Potsdam, New York 13699, USA
Zhenyu Zhang, International Center for Quantum Design of Functional Materials (ICQD), Hefei Laboratory for Physical Sciences at Microscale (HFNL), and Synergetic Innovation Center of National Quantum Information and Quantum Physics, University of Science and Technology of China, Hefei 230026, China

Keywords

SnO2, nanoceramics, sensors, hydrogen, room-temperature

Abstract

ABSTRACT Contrasting room-temperature hydrogen sensing behaviors have been revealed for Pt-TiO2 and Pt-SnO2 composite nanoceramics. In the case of the Pt-TiO2 nanoceramics, the ultrahigh hydrogen sensitivities are lost abruptly when the oxygen/hydrogen concentration ratio in ambient atmosphere reaches a critical value. However, in the case of the Pt-SnO2 nanoceramics, such a phenomenon does not occur, and the extraordinary room-temperature hydrogen sensing capabilities are observed in the presence of oxygen in air. Our combined experimental and theoretical investigations establish a unified mechanism for both the systems, which is rooted in hydrogen chemisorption on the surface and interstitial lattice sites of SnO2 and TiO2; the difference in stability of the chemisorbed hydrogen on SnO2 and TiO2 is considered responsible for the contrasting hydrogen sensing capabilities. The central findings are helpful in enriching our microscopic understanding of hydrogen interaction with various metal oxide semiconductors (MOSs) at room temperature in varying mixed gaseous concentrations, and they could be instrumental in developing reliable room-temperature hydrogen sensors based on bulk MOSs.

Graphical Abstract

Publisher

Tsinghua University Press

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