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Sensors 2017, 17(10), 2220;

Ag-Modified In2O3 Nanoparticles for Highly Sensitive and Selective Ethanol Alarming

State Key Laboratory of Multiphase Complex Systems, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China
School of Metallurgical Engineering, Xi’an University of Architecture and Technology, Xi’an 710055, China
Beijing ChenJingLun High School, Beijing 100101, China
State Key Laboratory for Mechanical Behavior of Materials, Xi’an Jiaotong University, Xi’an 710049, China
Authors to whom correspondence should be addressed.
Received: 31 August 2017 / Revised: 22 September 2017 / Accepted: 26 September 2017 / Published: 27 September 2017
(This article belongs to the Special Issue Gas Sensors based on Semiconducting Metal Oxides)
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Pure In2O3 nanoparticles are prepared by a facile precipitation method and are further modified by Ag. The synthesized samples are characterized by scanning electron microscopy, transmission electron microscopy, energy dispersive X-ray spectroscopy, X-ray diffraction, Raman and UV-Vis spectra. The results show the successful heterojunction formation between Ag and In2O3. Gas sensing property measurements show that the 5 mol % Ag-modified In2O3 sensor has the response of 67 to 50 ppm ethanol, and fast response and recovery time of 22.3 and 11.7 s. The response is over one magnitude higher than that of pure In2O3, which can be attributed to the enhanced catalytic activity of Ag-modified In2O3 as compared with the pure one. The mechanism of the gas sensor can be explained by the spillover effect of Ag, which enhances the oxygen adsorption onto the surface of In2O3 and thus give rise to the higher activity and larger surface barrier height. View Full-Text
Keywords: In2O3 nanoparticles; Ag modification; heterojunction; high response; ethanol sensing In2O3 nanoparticles; Ag modification; heterojunction; high response; ethanol sensing

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Wang, J.; Xie, Z.; Si, Y.; Liu, X.; Zhou, X.; Yang, J.; Hu, P.; Han, N.; Yang, J.; Chen, Y. Ag-Modified In2O3 Nanoparticles for Highly Sensitive and Selective Ethanol Alarming. Sensors 2017, 17, 2220.

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