Journal
SENSORS AND ACTUATORS B-CHEMICAL
Volume 291, Issue -, Pages 155-163Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2019.04.009
Keywords
Zn2SnO4-ZnO; Heterointerface; Triethylamine; Gas sensor
Funding
- Project of Shandong Province Higher Educational Science and Technology Program [J16LA12]
- Qingdao Applied Basic Research Project [17-1-1-77-jch]
- Distinguished Taishan Scholars in Climbing Plan [tspd20161006]
- Natural Science Foundation of China [51772167]
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In this work, unique Zn2SnO4-ZnO hierarchical structures composed of one-dimensional Zn2SnO4 nanowires and two-dimensional ZnO nanosheets were successfully synthesized via a facile hydrothermal method combined with calcination. The Zn2SnO4 nanowires bridged across the ZnO nanosheets, which played an important role in electron transmission. Compared with pure Zn2SnO4 nanowires and pure ZnO nanosheets, the obtained Zn2SnO4-ZnO hierarchical structures exhibited improved gas-sensing performance toward triethylamine (TEA) in terms of a low operating temperature, high sensor response, and good selectivity. Gas-sensing test results revealed that the sensor response of Zn2SnO4-ZnO sensor reached 175.5 toward 100 ppm TEA at an optimum operating temperature of 200 degrees C, which is approximately 47.4 and 30.8 times higher than that of pure Zn2SnO4 and pure ZnO, respectively. In addition, the Zn2SnO4-ZnO hierarchical structures exhibited good selectivity and long-term stability to TEA, suggesting their potential application in advanced TEA gas sensors. The improved sensing properties of the Zn2SnO4-ZnO hierarchical structure could mainly be attributed to their large specific surface areas, unique bridged hierarchical microstructure, and appropriate energy band structure.
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