Journal
SENSORS AND ACTUATORS B-CHEMICAL
Volume 332, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2021.129497
Keywords
Rb-doped; In2O3; Hierarchical structure; NO2; Gas sensor
Funding
- National Natural Science Foundation of China [U1609212]
- Key Technology Research & Development Program of Shandong Province [2019JZZY010403]
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Rb-doped hierarchical flower-like In2O3 microspheres were synthesized and their gas sensing properties were systematically investigated. Sensors based on Rb-doped In2O3 exhibited ultrahigh response to NO2 and a low detection limit. The excellent performance was mainly attributed to its high specific surface area and novel structure.
In this work, Rb-doped hierarchical flower-like In2O3 microspheres were synthesized via a facile one-step solvothermal method along with the subsequent thermal treatment. The morphology and structure of the as-synthesized samples were characterized by X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), transmission electron microscopy (TEM), and X-ray photoelectron spectroscopy (XPS). Gas sensors based on the pure and Rb-doped In2O3 were fabricated and their gas sensing properties were systematically investigated. The sensors based on 1 mol% Rb-doped In2O3 exhibited ultrahigh response (Rg/Ra = 1502) to 5 ppm NO2 at 75 degrees C, which was over 2 times higher than that of pure In2O3. Moreover, the sensors showed good response towards NO2 down to ppb level (Rg/Ra = 10.2-100 ppb), a very low theoretical detection limit of 3.5 ppb, high selectivity and reliable repeatability. The excellent and enhanced NO2 gas sensing properties were mainly owing to its high specific surface area, novel hierarchical structure and increased surface chemisorbed oxygen species induced by Rb doping.
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