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ACS Appl Mater Interfaces

Title:		Oxygen Vacancies Enabled Porous SnO(2) Thin Films for Highly Sensitive Detection of Triethylamine at Room Temperature
Author(s):		Xu Y; Zheng L; Yang C; Zheng W; Liu X; Zhang J;
Address:		"College of Physics, Center for Marine Observation and Communications, Qingdao University, Qingdao 266071, China. Key Laboratory of Advanced Energy Materials Chemistry (Ministry of Education), Nankai University, Tianjin 300071, China"
Journal Title:		ACS Appl Mater Interfaces
Year:		2020
Volume:		20200423
Issue:		18
Page Number:		20704 - 20713
DOI:		10.1021/acsami.0c04398
ISSN/ISBN:		1944-8252 (Electronic) 1944-8244 (Linking)
Abstract:		"Detection of volatile organic compounds (VOCs) at room temperature (RT) currently remains a challenge for metal oxide semiconductor (MOS) gas sensors. Herein, for the first time, we report on the utilization of porous SnO(2) thin films for RT detection of VOCs by defect engineering of oxygen vacancies. The oxygen vacancies in the three-dimensional-ordered SnO(2) thin films, prepared by a colloidal template method, can be readily manipulated by thermal annealing at different temperatures. It is found that oxygen vacancies play an important role in the RT sensing performances, which successfully enables the sensor to respond to triethylamine (TEA) with an ultrahigh response, for example, 150.5-10 ppm TEA in a highly selective manner. In addition, the sensor based on oxygen vacancy-rich SnO(2) thin films delivers a fast response and recovery speed (53 and 120 s), which can be further shortened to 10 and 36 s by elevating the working temperature to 120 degrees C. Notably, a low detection limit of 110 ppb has been obtained at RT. The overall performances surpass most previous reports on TEA detection at RT. The outstanding sensing properties can be attributed to the porous structure with abundant oxygen vacancies, which can improve the adsorption of molecules. The oxygen vacancy engineering strategy and the on-chip fabrication of porous MOS thin film sensing layers deliver great potential for creating high-performance RT sensors"
Keywords:		gas sensor oxygen vacancy porous film room temperature tin dioxide;
Notes:		"PubMed-not-MEDLINEXu, Yongshan Zheng, Lingli Yang, Chen Zheng, Wei Liu, Xianghong Zhang, Jun eng 2020/04/16 ACS Appl Mater Interfaces. 2020 May 6; 12(18):20704-20713. doi: 10.1021/acsami.0c04398. Epub 2020 Apr 23"