Journal
SENSORS AND ACTUATORS B-CHEMICAL
Volume 290, Issue -, Pages 155-162Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2019.03.137
Keywords
In2O3 microspheres; Synergy; Au nanoparticles; Chemical sensitization; Spillover
Funding
- National Natural Science Foundation of China [21601098, 51602167]
- Shandong Provincial Science Foundation [ZR2016EMB07, ZR2017JL021]
- Key Research and Development Program [2018GGX102033]
- Qingdao Applied Fundamental Research Project [16-5-1-92-jch, 17-1-1-81-jch]
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Design of metal/semiconductor hybrid nanostructures provides an important strategy for developing efficient chemical gas sensors. Herein, a highly sensitive gas sensing material for detection of triethylamine is designed by loading Au nanoparticles on porous In2O3 microspheres. The In2O3 microspheres are prepared by thermally annealing the precursor of 3D nanosheets assembled In2S3 microspheres. Then, Au nanoparticles are functionalized onto In2O3 to obtain a novel Au/In2O3 hybrid microspheres. The morphological structure and chemical composition of the prepared materials were studied in detail by different techniques such as X-ray diffraction, scanning electron microscopy, transmission electron microscopy, and X-ray photoelectron spectroscopy. The gas sensing properties of the Au/In2O3 microspheres have been systematically investigated. Results reveal that the amount of Au has a large influence on the sensor performances. The Au/In2O3 sensor with Au content of 0.53 at. % exhibits the best response to triethylamine at 280 degrees C. An extremely high response of 648.2 is registered on exposure to 100 ppm triethylamine. The sensor also possess fast response-recovery and very stability, as well as a low detection limit of 108 ppb. The sensing mechanism behind the enhanced sensor performances are also discussed.
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