Chemical Analysis of CsPbBr2X (X = Cl, I) Nanocomposites by Total Reflection X-Ray Fluorescence Spectroscopy (TXRF)

An approach to TXRF determination of the composition of perovskite nanocomposites of the putative compositions CsPbBr2Cl and CsPbBr2I is proposed. Sample preparation consists in the treatment of hydrophobic samples with dimethylformamide (DMFA) and the subsequent dilution of the obtained solutions with water. When using a copper solution as an internal standard, the reproducibility of the results of TXRF determination of the elements is attained with Sr no more than 0.05. The validity of the determination of Cs, Pb, Br, and I is confirmed by the results of their determination by ICP-MS in solutions after processing samples in DMFA followed by dilution with 2