期刊
NANOSCALE
卷 10, 期 10, 页码 4841-4851出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c7nr08366a
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资金
- National Key Research and Development Program of China [2016YFC0207300]
- National Nature Science Foundation of China [61722305, 61503148, 61520106003, 61327804]
- National High-Tech Research and Development Program of China (863 Program) [2014AA06A505]
- Science and Technology Development Program of Jilin Province [20170520162JH]
- China Postdoctoral Science Foundation [2017T100208, 2015M580247]
- Graduate Innovation Fund of Jilin University [2017173]
The lower gas sensitivity, humidity dependence of the gas sensing properties, and long recovery times of room-temperature gas sensors severely limit their applications. Herein, to address these issues, a series of 3D inverse opal (IO) In2O3-ZnO heterogeneous composite microspheres (HCMs) are fabricated by ultrasonic spray pyrolysis (USP) employing self-assembled sulfonated polystyrene (S-PS) spheres as a sacrificial template. The 3D IO In2O3-ZnO HCMs possess highly ordered 3D inverse opal structures and bimodal (meso-scale and macro-scale) pores, which can provide large accessible surface areas and rapid mass transfer, resulting in enhanced gas sensing characteristics. Furthermore, the 3D IO architecture and n-n heterojunctions can extend the photoabsorption range to the visible light area, effectively prolonging the lifetimes of photo-generated charge carriers, and can increase separation of visible light-generated charges. As a result, the as-prepared 3D IO In2O3-ZnO HCMs deliver excellent NO2 sensing performance under visible light irradiation at room temperature, such as high sensitivity (Rgas/Rair = 54.3 to 5 ppm NO2), low detection limit (250 ppb), fast recovery time (188 s), excellent selectivity and humidity independence. These enhanced photo-electronic gas sensing properties are attributed to the combination of highly ordered 3D IO microspheres and In2O3-ZnO heterogeneous composites.
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