Abstract: A bisphenol-A (BPA) TiO2 gel molecularly imprinted electrochemical sensor was fabricated using gold nanoparticles (AuNPs) as sensitivity-enhanced materials based on surface sol-gel and self-assembly methods. AuNPs were characterized by scanning electron microscopy (SEM) and energy dispersive spectroscopy. BPA, TiO2 gel, and BPA-imprinted TiO2 gel were characterized by Fourier transform infrared (FTIR) spectrometry. Under optimal conditions, the sensor exhibits a good linear response from 1.0 x 10-8 to 1.0 x 10-5 mol/L for bisphenol A, with correlation coefficient 0.995 and a low detection limit of 0.6 x 10-8 mol/L (S/N=3). The prepared sensor was successfully applied in the detection of actual sample with 97.4%~103% recoveries.
Template and target information: bisphenol A, BPA
Author keywords: gold nanoparticles, bisphenol A, TIO2, sol-gel method, self-assembly method, Molecularly imprinted sensor