Preparation of an Electrode Modified with Graphene-gold Nanoparticles Based on Non-covalent Interaction and Its Application for Bisphenol A Detection
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Abstract:
A graphene-gold nanoparticle (graphene-AuNP) composite material was prepared based on cation-π non-covalent interaction and used to modify an electrochemical sensor for the quantitative detection of bisphenol A (BPA) in water samples. Scanning electron microscopy (SEM), energy-dispersive spectrum (EDS) and X-ray diffraction (XRD) techniques were utilized to characterize the graphene-AuNP composite material. Meanwhile, a graphene-AuNP modified glassy carbon electrode (graphene-AuNPs/GCE) was prepared, the electrochemical behavior of BPA on the surface of the graphene-AuNP/GCE was studied, and the developed sensor was applied to the detection of BPA levels in actual samples. The results showed that the composite material structure was stable, the particle size was uniform, and there was no aggregation. The modified electrode exhibited a significant electro-catalytic effect on BPA, and the current response of BPA on the modified electrodes was 6.3 times higher than that of the bare glass electrode. Under optimized conditions, BPA showed a linear relationship with the oxidation peak current in the concentration ranges of 5.7~570 ng/mL and 570~2280 ng/mL, with a limit of detection (LOD) of 1.9 ng/mL (S/N=3). The modified electrode was applied to the analysis of BPA in water samples, and the recovery rate ranged from 78.91 to 115.54 %.
