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Rational Design of 3D Inverse Opals Heterogeneous Composites Microspheres as Excellent Visible-Light-Induced NO2 Sensor at Room Temperature

Abstract

Lower gas sensitivity, the humidity dependence of the gas sensing properties, and long recovery time severely limit the application of room-temperature gas sensor. Herein, to solve these issues, a series of 3D inverse opals (IO) In2O3-ZnO heterogeneous composites microspheres (HCMs) are fabricated by ultrasonic spray pyrolysis (USP) employing self-assembly sulfonated polystyrene (S-PS) spheres as sacrificial template. The 3D IO In2O3-ZnO HCMs possess highly ordered 3D inverse opals structure and bimodal (meso-scale and macro-scale) pores, which can provide large accessible surface area and rapid mass transfer, resulting in enhanced gas sensing characteristics. Furthermore, the 3D IO architecture and n-n heterojunctions can extend the photo absorbing range to visible light area, effectively prolong lifetime of photo-generated charge carriers, and 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 independent. The advance in photo-electronic gas sensing properties is attributed to the combining of highly ordered 3D IO microspheres and In2O3-ZnO heterogeneous composites.

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Publication details

The article was received on 10 Nov 2017, accepted on 08 Feb 2018 and first published on 09 Feb 2018


Article type: Paper
DOI: 10.1039/C7NR08366A
Citation: Nanoscale, 2018, Accepted Manuscript
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    Rational Design of 3D Inverse Opals Heterogeneous Composites Microspheres as Excellent Visible-Light-Induced NO2 Sensor at Room Temperature

    T. Wang, Q. Yu, S. Zhang, X. Kou, P. Sun and G. Lu, Nanoscale, 2018, Accepted Manuscript , DOI: 10.1039/C7NR08366A

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