Enhanced Ethanol Sensing Performance of ZnO-SnO2 Heterostructure Nanotubes

被引：6
作者：
An, Xiuyun [1 ]
Guo, Shilei [1 ]
Su, Jianfeng [1 ]
Hu, Qiubo [1 ,2 ]
Zhu, Weili [1 ]
Liu, Lina [1 ]
Zhang, Yongsheng [1 ]
Liu, Guofeng [3 ]
机构：
[1] Luoyang Inst Sci & Technol, Dept Math & Phys, Luoyang 471023, Peoples R China
[2] Nanjing Univ, Natl Lab Solid State Microstruct, Nanjing 210093, Jiangsu, Peoples R China
[3] Changan Univ, Sch Highway, Xian 710064, Shanxi, Peoples R China
来源：
SCIENCE OF ADVANCED MATERIALS | 2019年 / 11卷 / 03期
基金：
中国国家自然科学基金;
关键词：
ZnO-SnO2; Heterostructure Nanotubes; Ethanol Sensor; HOLLOW SPHERES; SNO2; HETEROJUNCTION; CONSTRUCTION; NANOFIBERS; NANORODS;
D O I：
10.1166/sam.2019.3466
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
ZnO-SnO2 heterostucture nanotubes with different Zn contents were prepared by single-needle electrospinning and subsequent annealing. The nanotubes are consisted of numerous nanosized grains arranged along the length direction, which can be obviously observed with high-resolution transmission electron microscopy (HRTEM). The results of photoluminescence (PL) indicated that the surface oxygen vacancy concentration can be adjusted by tuning the content of zinc in the nanotubes. The sensing performance to ethanol can be optimized with the molar ratio of Zn and Sn. Our results show when the molar ratio is 1:2 (Zn:Sn), the ethanol sensor exhibits the highest response to 100 ppm ethanol at the lowest temperature of 175 degrees C. The decrease in operating temperature and the increase in response could be attributed to the formation of n-n heterostructure between ZnO and SnO2, and the increase of surface oxygen vacancies. Our work has proposed a strategy to optimize ethanol sensors by building heterostructure junctions.
引用
收藏
页码：360 / 365
页数：6
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