Ag@SnO2/CsPbBr3 nanocomposite gas sensor for well-behaved low-concentration ethanolamine sensing at room temperature

It is a novel-effective process for realizing high-efficiency sensing and continuous gas monitoring by introducing precious metals into metal–oxide–semiconductors (MOSs). In this study, Ag is exploited to prepare surface functionalized SnO 2 nanoparticles (NPs) and innovative x Ag@SnO 2 /CsPbBr 3 , activating and catalyzing the gas sensing reactions on semiconductors. The results show that the precious metal Ag NPs promote the directional transport of carriers, thus improving the gas sensing performances. In addition, innovative x Ag@SnO 2 /CsPbBr 3 composites originated from Ag@SnO 2 NPs and 3-mercaptopropionic acid treated all-inorganic perovskite CsPbBr 3 are constructed to further accelerate electron transfer on heterointerfaces, enabling continuous and efficient monitoring of ethanolamine (EA) at room temperature. The sensing properties of Ag@SnO 2 /CsPbBr 3 on various volatile organic compounds are investigated. Compared with pure CsPbBr 3 , the EA response of as-prepared 2Ag@SnO 2 /CsPbBr 3 is obviously improved by about sevenfold. The response/recovery time is greatly shortened, besides the good stability. Another interesting result for x Ag@SnO 2 /CsPbBr 3 is the lower limit of detection of 44.43 ppb. The work demonstrates that Ag modification facilitates the adsorption/desorption rate and the response. Furthermore, the catalytic activation of noble metal Ag NPs and the synergistic interaction of SnO 2 /CsPbBr 3 nano-heterojunctions promote EA sensing performances at room temperature.