Electrochemiluminescent graphene quantum dots enhanced by MoS2 as sensing platform: a novel molecularly imprinted electrochemiluminescence sensor for 2-methyl-4-chlorophenoxyacetic acid assay

The ECL properties and application of a novel luminescent material molybdenum disulfide-graphene quantum dots (MoS2-GQDs) hybrid nanocomposite was reported for the first time. The hybridization of MoS2 and GQDs endowed nanocomposite with structural and compositional advantages for boosting the ECL performance of GQDs. Impressively, the ECL could be remarkable enhanced using MoS2-GQDs hybrid nanocomposite, which was similar to 13, similar to 185 and similar to 596-folds larger than the ECL intensity of GQDs, MoS2 modified electrodes and bare electrode, respectively. Subsequently, as a sensing platform, the MoS2-GQDs hybrid nanocomposite was applied to fabricate molecularly imprinted electrochemiluminescence sensor for the ultrasensitive and selective determination cif 2-methyl-4-chlorophenoxyacetic acid. Under optimal conditions, the detection limit of the prepared serisor was 5.5 pmol L-1 (S/N =3) within a linear concentration range of 10 pmol L-1-0.1 mu mol L-1. The developped sensor exhibited high sensitivity, good selectivity, reproducibility and stability, suggesting the potential for detecting pesticides and veterinary drugs at trace levels in food safety and environmental control. (C) 2017 Elsevier Ltd. All rights reserved.