Electrochemiluminescence platform for curcumin detection based on g-C3N4 of N-rich vacancy and Ti2AlC

In this work, g-C 3 N 4 of N-rich vacancy (CNNV) and mesoporous SiO 2 were synthesized. A novel electrochemiluminescence (ECL) sensor for curcumin (Cur) based on CNNV@SiO 2 and Ti 2 AlC was constructed. An initial ECL signal was generated from the CNNV-S 2 O 8 2 − system. SiO 2 significantly adsorbed more S 2 O 8 2 − , thereby enhancing the ECL signal. Ti 2 AlC served as an effective co-reaction promoter, further amplifying the ECL signal of CNNV@SiO 2 -S 2 O 8 2 − system. With the addition of Cur, the ECL signal also decreased, which can be attributed to the resonance energy transfer (RET) mechanism between CNNV (donor) and Cur (acceptor). Under optimal conditions, a strong linear relationship was observed between the change in ECL signal (ΔI) and the logarithm of Cur concentration (lgC Cur ), spanning from 5 × 10 −15 to 5 × 10 −9  mol L −1 with a detection limit of 1.7 × 10 −15  mol L −1 . The constructed ECL sensor was successfully applied to detect Cur in real samples.