期刊
SENSORS AND ACTUATORS B-CHEMICAL
卷 282, 期 -, 页码 917-926出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2018.11.142
关键词
Au@WO3; Core-shell structure; Nanosphere; NO2; Gas sensor
资金
- National Natural Science Foundation of China [51674067, 51422402]
- Fundamental Research Funds for the Central Universities [N150101001, N160106004, N170106005]
- Liaoning BaiQianWan Talents Program [201892127]
As motivated by the driving force of the urgent demand for high-performance nitrogen dioxide (NO2) sensor, in this work, a novel structure of Au@WO3 core-shell nanospheres (CSNSs) was designed and successfully prepared for NO2 detection. The techniques of X-ray diffraction, field emission scanning electron microscopy, transmission electron microscopy, X-ray photoelectron spectroscopy, Brunauer-Emmett-Teller measurement, and elemental mapping analysis were used for the characterizations of the obtained samples. The results demonstrated that Au nanoparticles with 25-50 nm in diameter were successfully encapsulated by WO3 shells with the thickness of 30-50 nm. The NO2 sensing performance of the Au@WO3 CSNSs as well as the pure WO3 nanospheres were systematically investigated. Compared with the pure WO3 nanospheres, Au@WO3 CNNSs exhibited overall enhanced NO2 sensing performances in terms of response, detection limit, and response/recovery times. At the optimal operating temperature of 100 degrees C, Au@WO3 CSNSs showed excellent NO2 selectivity and long-term stability. Notably, the excellent NO2 sensing performance of Au@WO3 CSNSs was slightly affected by humidity. The possible sensing mechanism of the enhanced NO2 sensing properties of the Au@WO3 CSNSs was discussed.
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