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. 2024 Sep 7;191(10):579.
doi: 10.1007/s00604-024-06667-9.

Ionic liquid-assisted synthesis of In2O3 nanoparticles for ppb-level NO2 sensing at low temperature

Lili Sui  1 , Xin Ma  2 , Mingrui Yang  2 , Haixia Yu  2 , Ping Wang  2 , Dan Zhao  3 , Guoli Chen  2 , Ming Zhao  2   4 , Wenzhi Zhang  2 , Guohua Dong  2
Affiliations

Ionic liquid-assisted synthesis of In2O3 nanoparticles for ppb-level NO2 sensing at low temperature

Lili Sui et al. Mikrochim Acta. .

Abstract

Highly sensitive detection of nitric dioxide (NO2) has recently attracted much attention due to its harmful to the human health even at a low concentration of 0.1 parts per million (ppm). Herein, In2O3 nanoparticles (NPs) were prepared via a facile ionic liquid (IL) assisted solvothermal method with subsequent calcination and then were analyzed through the characterization of X-ray diffractometer (XRD), scanning electron microscope (SEM), transmission electron microscope (TEM), X-ray photoelectron spectroscopy (XPS) and nitrogen adsorption-desorption techniques. Morphological characterization demonstrated that the resultant compounds were In2O3 NPs with a diameter ranging from 20 to 30 nm. The gas sensor based on the In2O3 NPs prepared with IL exhibited excellent NO2-sensing properties in terms of fast response/recovery speed (26.6/10.0 s), high response (310.0), good repeatability and long-term stability to 10 ppm NO2 gas at low working temperature of 92 °C. The gas-sensing mechanism of In2O3 NPs to NO2 was represented to the surface adsorption control model and the possibilities relating to the improved NO2 sensing performance of the In2O3 NPs synthesized with IL-assisted were also discussed in detail.

Keywords: In2O3 nanoparticles; Ionic liquid; NO2 sensing; Gas sensor; Solvothermal method.

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