Swelling-shrinking modified hyperstatic hydrophilic perovskite polymer fluorescent beads for Fe(III) detection

Perovskite materials have shown great potential in various fields, such as photovoltaic devices, biomedical applications, and fluorescent probes. However, their hypersensitivity has significantly limited their practical application. In this paper, a modified swelling-shrinking strategy was adopted to encapsulate CsPbBr3 perovskite quantum dots into poly(styrene/acrylamide) nanospheres, in order to create novel hyperstatic and hydrophilic perovskite polymer fluorescent beads. The results show that the fluorescence characteristics did not noticeably change when the polymer materials were dispersed in an aqueous solution over 12 months. Under harsher conditions (acid, alkali, PBS, DMEM, temperature), the novel perovskite polymers showed unprecedented fluorescence stability, which was then applied to the selective sensing of Fe(III) in real samples. The results show that a good linear relationship between 5 and 150 μM was obtained under optimal conditions, and the limit of detection was approximately 2.2 μM. Furthermore, the Fe(III)-sensing applications in Yangtze River water, human serum and tea water has been proven with satisfying results.