Copper Oxide Nanoparticles with Graphitic Carbon Nitride for Ultrasensitive Photoelectrochemical Aptasensor of Bisphenol A

Abstract In this work, g‐C 3 N 4 , CuO and g‐C 3 N 4 /CuO−X (where × can be 3, 6, or 9) were synthesized through hydrothermal and calcination methods and used to fabricate photoelectrochemical (PEC) aptasensor for detection of bisphenol A (BPA). CuO nanoparticles covered with g‐C 3 N 4 were observed by scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The aptasensor based on g‐C 3 N 4 /CuO‐6 possessed high PEC activity due to its good conductivity and low electron recombination rate. PEC experiments demonstrate that the aptasensor based on g‐C 3 N 4 /CuO‐6 exhibits a broad linear range towards BPA from 0.02–10 ng L −1 and 50–1200 ng L −1 and reveals superior stability, selectivity and repeatability. Thus, g‐C 3 N 4 /CuO‐6 composite is a promising material for the determination of BPA in PEC field and has commercially viable.