UV excitation NO2 gas sensor sensitized by ZnO quantum dots at room temperature

Publication date: 15 April 2018
Source:Sensors and Actuators B: Chemical, Volume 259
Author(s): Tong Wu, Zhenbo Wang, Menghan Tian, Jiayu Miao, Haixue Zhang, Jianbo Sun
SnO2 nanosheets sensitized by ZnO quantum dots were used to fabricate UV excitation gas sensors for room temperature application. The morphology and structure of the as-synthesized samples were characterized by X-ray diffraction, transmission electron microscopy, and scanning electron microscopy. Photoluminescence spectra and UV–vis spectroscopy were used to investigate the material's UV-excited gas sensing properties and mechanism. The results showed that the composite material with molar proportion of Zn/Sn = 0.01 (SZQ 1%) was highly sensitive to NO2 at room temperature. The possible UV excitation gas sensing mechanism was discussed.

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