Study On Electrochemical Bisphenol A Sensor Based On Gold Nanoparticles Film And Molecularly Imprinted Polymers

Bisphenol A has been widely found in water, soil, and sediments, as an important industrial raw material. Through simulation, researchers found that the distribution ratio of BPA in the three medium was up to52%,25%,23%. Owning to the complexity of environmental samples and requirements of on-site probing, rapid, highly sensitive and selective analysis methods become one key issue in related studies of BPA detection.As an ideal self-assembly interface, the gold atoms on the surface of Au electrode can form the Au-S bond with4-mercapto aniline, and make an ordered single molecular layer of4-mercapto aniline on the surface of the Au electrode. An electrochemical sensor with specific selectivity towards BPA can be made on the self-assembly surface of Au electrode by electrochemical polymerization of molecularly imprinted polymer (MIPs). An electrochemical BPA sensor with higher sensitivity can be obtained through electrochemical deposition of gold nanoparticles.In this work, the gold nanoparticles (AuNPs) modified molecularly imprinted polymers (MIPs) sensing electrode towards bisphenol A has been made by electrochemical methods and molecular imprinting technique on the surface of the Au electrode substrate. SEM, TEM and electrochemical analysis were employed to characterize the films on electrode. The results show that the electrochemical deposition method can make the gold nanoparticles grow regularly and the obtained film uniform. AuNPs modified Au electrode has a three-dimensional structure on the surface, and part of gold nanoparticles can be found within the mosaic structure in the MIPs, which increases the surface conductivity of the electrode significantly. The signal responses to bisphenol A show that the MIP-AuNPs-Au electrode has a2.63times higher response compared to the MTPs-Au electrode and its detection limit is1.47×10-8mol/L in detecting bisphenol A. Besides, the MIPs-AuNPs-Au electrode has a good selectivity towards bisphenol A and favorable stability.