Bisphenol A Imprinted Electrochemical Sensor Based on Graphene Quantum Dots with Boron Functionalized g-CN in Food Samples.

A molecular imprinted electrochemical sensor based on boron-functionalized graphitic carbon nitride (B-g-CN) 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-CN nanocomposite, a highly selective and sensitive analytical method was developed for BPA analysis. Firstly, GQDs/B-g-CN 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 × 10-1.0 × 10 M and a low detection limit (LOD, 3.0 × 10 M). BPA-imprinted polymer on GQDs/B-g-CN nanocomposite also showed good stability, repeatability and selectivity in food samples.