Quick preparation of water-soluble perovskite nanocomposite via cetyltrimethylammonium bromide and its application

A good water-soluble and stable nanocomposite has been facilely prepared by the encapsulation of CsPbBr3 QDs via cetyltrimethylammonium bromide and mineral oil through sonication, namely CsPbBr3@CMO nanocomposite. Such method is very quick and simple without complicated instruments and strict conditions. The results reveal that the synthesized CsPbBr3@CMO nanocomposite is spherical with uniform size and shows remarkably good solubility and stability in water. Specifically, the fluorescent intensity of CsPbBr3@CMO nanocomposite in water is decreased by 0.76% after 3 h; this result is comparable with those in earlier studies, and the good stability in water might be owned to the hydrophobic core of the CsPbBr3@CMO nanocomposite. The prepared CsPbBr3@CMO nanocomposite has been applied as a sensitive fluorescent probe for monitoring hydrogen sulfide (H2S), and the fluorescence intensity (similar to 524 nm) has a linear relationship with the concentration of H2S in the range 0.15-105 mu M with a detection limit of 53 nM, demonstrating application for monitoring H2S in rat brain coupled with microdialysis apparatus with satisfied results. The present study not only provides a simple but sensitive approach for the detection of H2S in living body, but also paves the way for expanding the application of CsPbBr3 QDs to aqueous medium.

Automated summary

A water-soluble and stable nanocomposite CsPbBr3@CMO has been prepared via sonication, showing excellent solubility and stability in water. It can be used as a sensitive fluorescent probe for monitoring hydrogen sulfide with a linear relationship and a low detection limit, providing a simple yet sensitive approach for detection in living bodies.