期刊
SENSORS AND ACTUATORS B-CHEMICAL
卷 294, 期 -, 页码 106-115出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2019.04.061
关键词
SnO/SnO2 heterojunction; Formaldehyde gas sensor; Nano-flowers hierarchical microstructure; Gas sensing mechanism; Nanosheets
资金
- National Natural Science Foundation of China [61671284, u1704255]
- Shanghai Municipal Education Commission (Peak Discipline Construction program)
Here we report a hierarchical flower-like SnO/SnO2 gas sensing material for detecting formaldehyde vapor at a low temperature. It was rationally designed and successfully synthesized via a one-step hydrothermal route. The crystal phase, defects, element composition and morphology of the obtained samples were characterized in detail by XRD, FESEM, TEM, Raman, PL, and XPS. The characterized results reveal that hierarchical SnO/SnO2 nano-flowers are assembled from ultrathin nanosheets with about 9-11 nm in thickness. Gas sensing performance shows that the sensor based on SnO/SnO2 nano-flowers has crucial advantages for formaldehyde detection, such as low operating temperature (120 degrees C), excellent selectivity, short response time (7 s), high response value (80.9) and low detection limitation (8.15 ppb). The excellent gas responses of the sensor can be attributed to its unique hierarchical microstructure (for decrease of R-g and increase of R-a) and p-n junction between SnO and SnO2 (for increase of R-a). Finally, the sensing mechanism of the prepared was proposed in detail.
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