【摘 要】
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In this paper,a novel SnSe/SnO2 nanoparticles(NPs) composite has been successfully fabricated through hydrothermal method and surface oxidation treatment.The as
【机 构】
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College of Control Science and Engineering,China University of Petroleum (East China),Qingdao 266580
论文部分内容阅读
In this paper,a novel SnSe/SnO2 nanoparticles(NPs) composite has been successfully fabricated through hydrothermal method and surface oxidation treatment.The as-prepared sample was characterized by X-ray diffraction(XRD),scanning electron microscopy (SEM),X-ray pho-toelectron spectroscopy (XPS) and transmission electron microscopy (TEM).A series of morphological and struc-tural characteristics confirm that the SnSe/SnO2 NPs composite shows a core-shell structure with a SnO2 shell with thickness of 6 nm.The prepared SnO2 NPs and SnSe/SnO2 NPs composite were applied as gas-sensing materi-als,and their gas-sensing properties were investigated at room temperature systematically.Experimental results show that the response value of the SnSe/SnO2 composite sensor toward 100 × 10-6 SO2 is 15.15％,which is 1.32 times higher than that of pristine SnSe (11.43％).And the SnSe/SnO2 composite sensor also has a detection limit as low as 74 × 10-9 and an ultra-fast response speed.The enhanced gas-sensing performance is attributed to the formation of p-n heterojunction between SnSe and SnO2 and the appropriate SnO2 shell thickness.
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