Journal
SENSORS AND ACTUATORS B-CHEMICAL
Volume 345, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2021.130357
Keywords
Iron selenide; Hematite; n-n junction; Oxygen spillover; First-principle calculation; NO2 sensing
Funding
- National Natural Science Foundation of China [51802252]
- Natural Science Foundation of Shaanxi Province [2020JM-032, 2021JQ-015]
- Natural Science Foundation of Jiangsu Province [BK20180237, BK20200242]
- Natural Science Foundation of Guangxi Zhuang Autonomous Region [2018JJA160261]
- 111 project 2.0 [BP2018008]
- China Postdoctoral Science Foundation [2021M692546]
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This study investigates a novel n-n FeSe2/hematite heterojunction for NO2 detection, showing high response and fast sensing kinetics. The heterostructure exhibits excellent stability and selectivity to NO2 gas at low temperatures.
Increasing the efficiency of nitrogen dioxide (NO2) sensing has been researched in-depth owing to the destructive and pernicious impacts of the gas on both the environment and human health. In this work, a novel n-n FeSe2/ hematite heterojunctions have been constructed through the controllable surface oxidation of FeSe2 nanoparticles and used for NO2 detection. Theoretical calculations suggest that the FeSe2/Fe2O3 interface can facilitate the electron and mass transfer through the n-n junction and oxygen spillover effect, energetically contributing to enhanced NO2 adsorption. In terms of NO2 sensing, the FeSe2/Fe2O3 nanocomposite exhibits a higher response (14.1-100 ppm) and faster sensing kinetics (10-30 s) than its FeSe2 and Fe2O3 counterparts. Such a heterostructure also demonstrates a ppb-level detection capacity, outstanding stability and selectivity to NO2 gas against other interfering gases at low temperatures (110 celcius). In situ Raman and Mott-Schottky measurements were further conducted to analyze the interface electronic properties and NO2 gas adsorption behaviors. The results from this investigation suggest that the NO2 gas could be reversibly chemi-adsorbed and desorbed on the surface of the FeSe2/Fe2O3 heterostructure for fast sensing response and recovery. This study presents fundamental insights into the rational design and implementation of highly efficient NO2 sensing materials through oxide/chalcogenide interface coupling.
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