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

In this work, g-C3N4, CuO and g-C3N4/CuO-X (where x 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-C3N4 were observed by scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The aptasensor based on g-C3N4/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-C3N4/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-C3N4/CuO-6 composite is a promising material for the determination of BPA in PEC field and has commercially viable.