Colorimetric Sensing of Hydrogen Peroxide Based on the Wavelength-Shift of CsPbBr3 Perovskite Nanocrystals on Water-Oil Interface

In this study, the halogen exchange reactions are investigated between KI or methylamine iodide in aqueous solution and CsPbBr3 NCs in toluene. The mass transfer process on the interface between water and toluene affects the halogen exchange time and efficiency. Stirring and heating can effectively improve the halogen exchange efficiency and increases the sensing sensitivity. The photoluminescence wavelength shift of CsPbBr3 NCs shows good linear relationship with the concentration of I- in the range from 0 to 20 nmol/L with the detection limit of 0.2 nmol/L I-. Taking H2O2 as a typical water-soluble oxide, the method is applied to the colorimetric sensing of H2O2 in water solution. After the optimization of sensing conditions, the obvious wavelength shift could be observed with the different concentration range of H2O2. A good linear relationship between the wavelength shift and the H2O2 concentration from 0 to 1.0 mmol/L with the detection limit of 0.05 mmol/L H2O2 could be found.

Automated summary

This study investigates the halogen exchange reactions in aqueous solution on CsPbBr3 NCs and demonstrates their potential application in sensing I- and H2O2 concentrations.