NO 2 gas sensors based on metal oxides under wild conditions are highly demanded yet an incomplete surface reaction and humidity interference on the gas-sensing performance limit their applications. Herein, we report three-dimensional (3D) porous In 2 O 3 microcubes via a simple hydrothermal strategy to produce outstanding NO 2 gas-sensing performance: fast equilibrium of the surface reaction at 150 °C and negligible humidity dependence on the NO 2 gas sensing at room temperature. The 3D porous In 2 O 3 microcubes with high surface areas, suitable pore sizes, rich oxygen vacancies, and high conductivity are testified. The underlying structural transformation mechanism for 3D porous In 2 O 3 is investigated in detail. The as-made 3D porous In 2 O 3 microcubic gas sensors present excellent gas-sensing performance to 50 ppm NO 2 at 150 °C, including a high response value (2329), fast response/recovery time (10/9 s), a low detection limit (10 ppb), long-term stability (60 days), and strong selectivity. Furthermore, they exhibit relatively stable NO 2 gas response under humidity variation (20–80%). The NO 2 gas mechanism under the interference of water is also clarified.
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Liu et al. (2021) studied this question.
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