State Key Laboratory of Silicate Materials for Architectures, School of Materials Science and Engineering , Wuhan University of Technology , Wuhan 430070 , P. R. China.
Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province, College of Optoelectronic Engineering , Shenzhen University , Shenzhen 518060 , China.
ACS Appl Mater Interfaces. 2019 Mar 6;11(9):9573-9582. doi: 10.1021/acsami.8b20830. Epub 2019 Feb 22.
Novel CuSbS quantum dots (QDs)/reduced graphene oxide (rGO) composites are self-assembled via a hot-injection method, and CuSbS QDs exhibit a near monodispersion on the rGO surface. The gas sensors based on CuSbS QDs/rGO composites show the relatively good gas responses toward NH with an outstanding detection limit of 500 ppb and an average response time of 50 s at room temperature, and visible light illumination is proven to further promote the sensing performance of the composites. The study of the sensing mechanism reveals that the acidic sites on the surface play an extremely important role in NH adsorption of the composites, and the reaction between NH molecules and the pre-adsorbed oxygen ions finally leads to the generation of NO molecules. The synergistic effect existing between CuSbS QDs and rGO, in terms of electron transfer, is certified as well.
新型 CuSbS 量子点 (QDs)/还原氧化石墨烯 (rGO) 复合材料通过热注射法自组装而成，CuSbS QDs 在 rGO 表面呈现近单分散性。基于 CuSbS QDs/rGO 复合材料的气体传感器对 NH 具有相对较好的气体响应，在室温下检测限低至 500 ppb，平均响应时间为 50 s，并且可见光照射被证明可以进一步提高复合材料的传感性能。对传感机制的研究表明，表面的酸性位在复合材料对 NH 的吸附中起着极其重要的作用，NH 分子与预吸附的氧离子之间的反应最终导致 NO 分子的生成。CuSbS QDs 和 rGO 之间的电子转移协同效应也得到了证实。
