Bisphenol A Imprinted Electrochemical Sensor Based on Graphene Quantum Dots with Boron Functionalized g-C 3 N 4 in Food Samples.

A molecular imprinted electrochemical sensor based on boron-functionalized graphitic carbon nitride (B-g-C 3 N 4 ) and graphene quantum dots (GQDs) was presented for selective determination of bisphenol A (BPA). In particular, by combining the selectivity and high stability properties, which are the most important advantages of molecular imprinted polymers, and the highly sensitive properties of GQDs/B-g-C 3 N 4 nanocomposite, a highly selective and sensitive analytical method was developed for BPA analysis. Firstly, GQDs/B-g-C 3 N 4 nanocomposite was characterized by using microscopic, spectroscopic, and electrochemical techniques. This novel molecular imprinted electrochemical sensor for BPA detection demonstrated a linearity of 1.0 × 10 -11 -1.0 × 10 -9 M and a low detection limit (LOD, 3.0 × 10 -12 M). BPA-imprinted polymer on GQDs/B-g-C 3 N 4 nanocomposite also showed good stability, repeatability and selectivity in food samples.