Efficient chemiluminescence resonance energy transfer on the interface of europium doped ceria for sulfite detection in PM2.5

Chemiluminescence (CL) was a recognized excellent analytical method for SO 3 2− . Designing a CL sensing platform not only with selectivity but also with high sensitivity is of great significance for the SO 3 2− detection in complex samples. Herein, a novel chemiluminescence resonance energy transfer (CRET) strategy was designed by doping europium (Eu) into CeO 2 NPs. On the interface of Eu/CeO 2 , SO 3 2− was oxidized to generate the high-energy intermediate SO 2 * and the energy released was absorbed by Eu/CeO 2 nanoparticles to realize CRET. The energy donor (SO 2 * generated by the reaction of Eu/CeO 2 nanoparticles and HSO 3 - ) and the receptor (Eu/CeO 2 nanoparticles) are assembled together which simplifies system and improves the energy efficiency. The CRET system with rapid response (1 s) and high sensitivity (0.007 μM) was successfully exploited for the selective detection of SO 3 2− even in PM 2.5 samples. The study provides a new clue to design simple CL sensors with high selectivity and high sensitivity.