Journal of Hazardous Materials ( IF 12.2 ) Pub Date : 2022-04-11 , DOI: 10.1016/j.jhazmat.2022.128836
Yajie Zhang 1 , Yadong Jiang 1 , Zaihua Duan 1 , Yingwei Wu 1 , Qiuni Zhao 1 , Bohao Liu 1 , Qi Huang 1 , Zhen Yuan 1 , Xian Li 2 , Huiling Tai 1
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Nitrogen dioxide (NO2) is one of the most hazardous toxic pollutants to human health and the environment. However, deficiencies of low sensitivity and poor selectivity at room temperature (RT) restrain the application of NO2 sensors. Herein, the edge-enriched MoS2 nanosheets modified porous nanosheets-assembled three-dimensional (3D) In2O3 microflowers have been synthesized to improve the sensitivity and selectivity of NO2 detection at RT. The results show that the In2O3/MoS2 composite sensor exhibits a response as high as 343.09–5 ppm NO2, which is 309 and 72.5 times higher than the sensors based on the pristine MoS2 and In2O3. The composite sensor also shows short recovery time (37 s), excellent repeatability and long-term stability. Furthermore, the response of the In2O3/MoS2 sensor to NO2 is at least 30 times higher than that of other gases, proving the ultrahigh selectivity of the sensor. The outstanding sensing performance of the In2O3/MoS2 sensor can be attributed to the synergistic effect and abundant active sites originating from the p-n heterojunction, exposed edge structures and the designed 2D/3D hybrid structure. The strategy proposed herein is expected to provide a useful reference for the development of high-performance RT NO2 sensors.
中文翻译:
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边缘富集 MoS2 纳米片改性多孔纳米片组装分层 In2O3 微花用于室温检测 NO2 具有超高灵敏度和选择性
二氧化氮(NO 2)是对人类健康和环境危害最大的有毒污染物之一。然而,在室温(RT)下灵敏度低和选择性差的缺陷限制了NO 2传感器的应用。在此,本文合成了边缘富集的MoS 2纳米片修饰的多孔纳米片组装的三维(3D)In 2 O 3微花,以提高在室温下检测NO 2的灵敏度和选择性。结果表明,In 2 O 3 /MoS 2复合传感器的响应高达 343.09–5 ppm NO 2,分别是基于原始 MoS 2和 In 2 O 3的传感器的 309 倍和 72.5 倍。该复合传感器还显示出较短的恢复时间(37 秒)、出色的可重复性和长期稳定性。此外,In 2 O 3 /MoS 2传感器对NO 2的响应至少是其他气体的30倍,证明了传感器的超高选择性。In 2 O 3 /MoS 2的卓越传感性能传感器可归因于协同效应和源自 pn 异质结的丰富活性位点、暴露的边缘结构和设计的 2D/3D 混合结构。本文提出的策略有望为高性能 RT NO 2传感器的开发提供有用的参考。