标题：SnO2 core-shell hollow microspheres co-modification with Au and NiO nanoparticles for acetone gas sensing
作者：Wang X.; Liu F.; Chen X.; Lu G.; Song X.; Tian J.; Cui H.; Zhang G.;等
作者机构：[Wang, X] School of Materials Science and Engineering, Shandong University of Science and Technology, Qingdao, Shandong 266590, China;[ Liu, F] Schoo 更多
通讯作者地址：[Wang, X] School of Materials Science and Engineering, Shandong University of Science and TechnologyChina;
关键词：Co-modification; Core-shell structure; Gas sensor; Heterojunction; Tin oxide
摘要：SnO2 core-shell hollow microspheres co-modified with Au and NiO nanoparticles (Au-NiO@SnO2) were successfully fabricated for use as an acetone gas sensor. The SnO2 core-shell hollow microspheres were prepared by a facile chemical precipitation method using tin tetrachloride pentahydrate (SnCl4·5H2O) and 4-methylimidazole as the primary raw materials. The co-modification with Au and NiO nanoparticles was carried out by a simple chemical reduction approach. Compared with Au@SnO2, NiO@SnO2, and pure SnO2, the Au-NiO@SnO2 core-shell hollow microspheres exhibited enhanced gas sensing properties toward acetone including high response, fast response-recovery speed, good selectivity, low detection limit, and work stability. The improved gas sensing performance was attributed to the unique SnO2 core-shell hollow microsphere structure, the p-n heterojunction between NiO and SnO2, and the catalytic action of Au nanoparticles. © 2020 Elsevier B.V.