Dual-ligand strategy boosted electrochemiluminescence sensing based on Tb-MOF/Ag3PO4@TCPP

A dual-ligand strategy was employed to construct an electrochemiluminescence (ECL) sensing platform based on dual-ligand Tb-MOF and Ag 3 PO 4 @TCPP for sensitive detection of chloramphenicol (CAP), demonstrating its potential applications in environmental monitoring and food safety. The dual-ligand Tb-MOF can be used as a co-reactant promoter, facilitating the rapid electroreduction of S 2 O 8 2− to generate more oxidative mediator SO 4 •− , thereby enhancing the luminescence efficiency of the luminescent material Ag 3 PO 4 @TCPP. Furthermore, the integration of Ag 3 PO 4 @TCPP emitter could effectively overcome the aggregation-caused quenching (ACQ) effect of TCPP and then increase the luminescence intensity by seven-fold, which was attributed to the efficient electron transfer and energy transfer between Ag 3 PO 4 and TCPP. Additionally, ECL spectra and electron spin resonance (ESR) spectra were utilized to investigate the possible ECL mechanism of the dual-ligand Tb-MOF/Ag 3 PO 4 @TCPP system. As a proof of concept, we successfully established an ECL biosensor for detecting CAP, which displayed a wide linear range (10 −6  ~ 10 −15  M) and low detection limit (8.29 × 10 −16  M), demonstrating practical feasibility. This study introduces a dual-ligand strategy to enhance ECL signals, expands the application scope of dual-ligand lanthanide MOFs, and provides new insights into designing high-performance sensing platforms. Graphical