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A "signal on" aptasensor was fabricated for chlorpyrifos detection by a highly efficient electrochemiluminescence resonance energy transfer (ECL-RET) strategy between MoS₂/CdS nanospheres and silver/carbon quantum dots (Ag/CQDs). Compared with the conventional MoS₂/CdS nanosheets, the MoS₂/CdS nanospheres have a larger specific surface area and electron density, which makes the catalytic effect on K₂S₂O₈ stronger and has higher luminescence intensity. As a receptor, through the synergistic effect of Ag NPs and CQDs, it has a very wide absorption band between 300 and 600 nm. The absorption band and the emission spectrum of MoS₂/CdS completely overlap, and the high quantum yield of Ag/CQDs can achieve efficient energy resonance transfer. The proposed ECL aptasensor provided a linear range from 10 nM to 1.0 fM for chlorpyrifos detection and the detection limit of 0.35 fM (S/N …