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Issue 8, 2020
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Au-modified three-dimensionally ordered macroporous ZnO:In for high-performance ethanol sensors

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Abstract

In this paper, Au-modified three-dimensionally ordered macroporous ZnO:In (3DOM Au–ZnO:In) was synthesized by a one-pot method using a PMMA colloidal crystal template. The 3DOM ZnO:In with uniformly dispersed Au had large specific surface areas and highly ordered pore structures. The ethanol-sensing properties of 3DOM Au–ZnO:In were investigated and the sensor based on the 0.050 mol% Au-loaded 3DOM ZnO:In exhibited the highest sensitivity (∼240) to 100 ppm ethanol at the optimum operating temperature of 250 °C. Moreover, the fabricated sensor exhibited excellent selectivity and good stability. Therefore, the Au-modified 3DOM ZnO:In is a promising material for a novel ethanol sensor. The reason for the improvement of the sensitivity was investigated. The large surface area of the 3DOM structure was beneficial for gas adsorption and transfer, and In-doping can increase the electron carrier concentration. Moreover, Au modification enhanced the content of adsorbed oxygen, and thus resulted in a thick depletion layer and high sensitivity.

Graphical abstract: Au-modified three-dimensionally ordered macroporous ZnO:In for high-performance ethanol sensors

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Article information


Submitted
10 Dec 2019
Accepted
20 Jan 2020
First published
21 Jan 2020

J. Mater. Chem. C, 2020,8, 2812-2819
Article type
Paper

Au-modified three-dimensionally ordered macroporous ZnO:In for high-performance ethanol sensors

Z. Wang, Z. Tian, D. Han and F. Gu, J. Mater. Chem. C, 2020, 8, 2812
DOI: 10.1039/C9TC06750G

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