多孔ZnO-SnO_2异质结构的制备及气敏特性研究
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摘要
本研究采用溶剂热法制备了SnO_2介孔球,并以此为基础,将ZnO纳米颗粒负载到其表面,最终制备了ZnO/SnO_2异质结构。采用X射线衍射(XRD)、扫描电子显微镜(SEM)、X射线光电子能谱(XPS)和比表面测试(BET)对产物的晶体结构、微观形貌、元素化合态和孔结构进行了表征。气敏性能测试表明,多孔ZnO/SnO_2异质结构对三乙胺具有优异的气敏性能,对100 ppm三乙胺,灵敏度为88. 4,响应和恢复时间分别为12 s和15 s。此外,该材料对三乙胺表现出优异的选择性。从材料的多孔结构和异质结构能带匹配两方面对多孔ZnO/SnO2异质结构的作用机理进行了分析。
In this work,ZnO-SnO_2 heterostructure has been synthesized using mesoporous SnO_2 spheres as matrix following the decoration of ZnO nanoparticle,in which the mesoporous SnO_2 spheres were prepared via a solvethermal method. The crystal structure,microstructure,and the elemental consist of the product were characterized by X ray diffraction( XRD),scanning electron microscope( SEM),and X-ray photoelectron spectroscopy( XPS). Gas sensing test results indicate that the as prepared ZnO-SnO_2 heterostructure exhibit excellent sensing properties toward triethylamines( TEA). The response of ZnO-SnO_2 heterostructure toward 100 ppm TEA reached 88. 4,the response and recovery time were 12 s and 15 s. In addition,the ZnO-SnO_2 heterostructure displayed good selectivity toward TEA. The enhancement of the gas sensing was ascribed to the porous structure and the band structure matching of the ZnO-SnO_2 heterostructure.
In this work,ZnO-SnO_2 heterostructure has been synthesized using mesoporous SnO_2 spheres as matrix following the decoration of ZnO nanoparticle,in which the mesoporous SnO_2 spheres were prepared via a solvethermal method. The crystal structure,microstructure,and the elemental consist of the product were characterized by X ray diffraction( XRD),scanning electron microscope( SEM),and X-ray photoelectron spectroscopy( XPS). Gas sensing test results indicate that the as prepared ZnO-SnO_2 heterostructure exhibit excellent sensing properties toward triethylamines( TEA). The response of ZnO-SnO_2 heterostructure toward 100 ppm TEA reached 88. 4,the response and recovery time were 12 s and 15 s. In addition,the ZnO-SnO_2 heterostructure displayed good selectivity toward TEA. The enhancement of the gas sensing was ascribed to the porous structure and the band structure matching of the ZnO-SnO_2 heterostructure.
引文
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[3]Guo L L,Wang C,Kou X Y,et al.Detection of triethylamine with fast response by Al2O3/α-Fe2O3composite nanofibers[J].Sensors&Actuators B:Chemical,2018,266:139-148.
[4]张俊,董永平,白林山,等.以碳球为造孔剂的Zn O多孔材料的制备及其气敏性能研究[J].安徽工业大学学报,2016,33(2):119-125.
[5]宋玉哲,刘斌,韩根亮,等.氧化铟空心多孔微球的合成及其气敏性能研究[J].甘肃科学学报,2015,27(5):57-60.
[6]Yang H M,Ma S Y,Jiao H Y,et al.Synthesis of Zn2Sn O4hollow spheres by a template route for high-performance acetone gas sensor[J].Sensors and Actuators B:Chemical,2017,245:493-506.
[7]Zhai T,Xu H Y,Li W R,et al.Low-temperature in-situ growth of Sn O2nanosheets and its high triethylamine sensing response by constructing Au-loaded Zn O/Sn O2heterostructure[J].Journal of Alloys and Compound,2018,737:603-612.
[8]Das P P,Roy A,Tathavadekar M,et al.Photovoltaic and photocatalytic performance of electrospun Zn2SnO4 hollow fibers[J].Applied Catalysis B:Environmental,2017,203:692-703.
[9]Wang X,Liu W,Liu J,et al.Synthesis of nestlike Zn Ohierarchically porous structures and analysis of their gas sensing properties[J].ACS Applied Materials&Interfaces,2012,4:817-825.
[10]Liu F,Huang G,Wang X.High response and selectivity of single crystal Zn O nanorods modified by In2O3nanoparticles for n-butanol[J].Sensors and Actuators B:Chemical,2018,277:144-151.