Rational design of 3D inverse opal heterogeneous composite microspheres as excellent visible-light-induced NO2 sensors at room temperature

Nanoscale
Tianshuang WangGeyu Lu

Abstract

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 independenc...Continue Reading

References

Aug 22, 2013·ACS Applied Materials & Interfaces·Gajendra Kumar PradhanK M Parida
Dec 15, 2015·Advanced Materials·Jun ZhangNicola Pinna

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Citations

Sep 29, 2019·Physical Chemistry Chemical Physics : PCCP·Yong-Hui ZhangShao-Ming Fang
Mar 17, 2021·ACS Applied Materials & Interfaces·Hien Duy MaiKi-Joon Jeon

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Methods Mentioned

BETA
X-ray
scanning
transmission electron microscopy
electron diffraction

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