Monodisperse Spherical Sandwiched Structured SiO2@CsPbX3@SiO2 Perovskite Composites for the Determination of Fe3+ Ion in Water Samples

• Published in: Journal of analysis and testing 2021-03, Vol.5 (1), p.40-50
• Main Authors: Tan, Xiao-Hong, Huang, Guo-Bin, Cai, Zhi-Xiong, Li, Fei-Ming, Zhou, Yan-Mei, Zhang, Mao-Sheng
• Format: Article
• Language: English
• Subjects: Analytical Chemistry; Characterization and Evaluation of Materials; Chemistry; Chemistry and Materials Science; Monitoring/Environmental Analysis; Original Paper
• ISSN: 2096-241X; 2509-4696
• DOI: 10.1007/s41664-021-00164-1

The application of all-inorganic CsPbX 3 (X = Cl − , Br − and I − ) perovskite nanocrystals (PNCs) is hindered by their poor stability under different environments (moisture, UV light and high temperature). Herein, we demonstrate a novel in-situ growth and post-coating technique to prepare monodisperse spherical sandwiched structured SiO 2 @CsPbX 3 @SiO 2 perovskite composites. In this strategy, the environmental stability of CsPbX 3 PNCs is remarkably improved due to protecting evenly distribution in the surface of composites through the design of spherical sandwiched structure, and the negative effects of SiO 2 coating on photoluminescence property of CsPbX 3 PNCs could be reduced effectively. Furthermore, regular monodisperse spherical structure and uniform size of composites greatly benefit their application in relative fields. The experiment results indicate that the as-prepared product have outstanding abilities of water-, oxidation- and UV radiation resistance. Finally, the SiO 2 @CsPbBr 3 @SiO 2 perovskite composites are successfully used for highly sensitive detection of Fe 3+ in water sample. The results show limit of detection (LOD) is 3 µM and good linearity is between 10 and 70 µM ( R 2  = 0.9963). Furthermore, the proposed perovskite composites have been successfully applied for the analysis of Fe 3+  in real samples with satisfactory results.