High ammonia sensitive ability of novel Cu12Sb4S13 quantum dots@reduced graphene oxide nanosheet composites at room temperature

• Published in: Chinese chemical letters Vol. 31; no. 8; pp. 2109 - 2114
• Main Authors: Liu, Yueli, Sang, Binghua, Wang, Haoran, Wu, Zijing, Wang, Yuxuan, Wang, Ziwei, Peng, Zhuoyin, Chen, Wen
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01.08.2020; State Key Laboratory of Silicate Materials for Architectures, School of Materials Science and Engineering, Wuhan University of Technology, Wuhan 430070, China%The Key Laboratory of Efficient&Clean Energy Utilization, School of Energy and Power Engineering, Changsha University of Science and Technology, Changsha 410111, China%State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, School of Materials Science and Engineering, Wuhan University of Technology, Wuhan 430070, China
• Subjects: Composites; Cu12Sb4S13 quantum dots@rGO nanosheet; Gas response; NH3; Room temperature; NH3; Composites; Cu12Sb4S13 quantum dots@rGO nanosheet; Room temperature; Gas response
• ISSN: 1001-8417; 1878-5964
• DOI: 10.1016/j.cclet.2019.12.030

Schematic diagram of the gas sensing mechanism and performance of Cu12Sb4S13 quantum dots@rGO composites towards NH3 at room temperature. [Display omitted] •Novel Cu12Sb4S13 QDs@rGO composites are successfully prepared via solvent thermal method.•The composites exhibit excellent responses towards NH3 at room temperature with a detection limit of 1 ppm.•The composites possess an excellent stability during the humidity range of 45 %–80 % and a quite high selectivity towards ammonia. In the work, rGO nanosheet is synthesized using the typical Hummer’s method, then Cu12Sb4S13 quantum dots@rGO composites are prepared by solvent thermal method, and Cu12Sb4S13 quantum dots with the average size of 5 nm are densely distributed on the surface of rGO sheet. NH3 gas response of Cu12Sb4S13 quantum dots@rGO nanosheet composites at room temperature of 25 °C is enhanced compared with the pure Cu12Sb4S13 quantum dots and rGO nanosheet, and the composites possess an excellent stability during the humidity range of 45%–80% with a low detection limit of 1 ppm, which is related with the intrinsic hydrophobicity characteristic of Cu12Sb4S13 quantum dots. It also proves that Cu12Sb4S13 quantum dots@rGO nanosheet composites have a quite high selectivity towards ammonia compared with ethanol, methanol, acetone, toluene, hydrogen sulfide and nitrogen dioxide at room temperature. The gas sensing mechanism of the composites is discussed primarily.