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Gold nanoparticles dotted ionic liquid functionalized carbon hybrid material for ultra-sensitive detection of bisphenol A
A highly effective electrochemical sensor was developed for highly sensitive detection of bisphenol A (BPA), based on gold nanoparticles (AuNPs) coated 1-butyl-3-methyl imidazole hydrobromide (ionic liquid, IL) functionalized grapheme oxide (GO) and carboxylic carbon nanotubes (CNT) composite film modified glassy carbon electrode. The negatively charged carboxylic acid functionalized carbon nanotubes and AuNPs can be adsorbed on the positively charged GO-IL composite film by electrostatic adsorption. The as-prepared GO-IL-CNT-AuNPs hybrid nanocomposites exhibit excellent water-solubility owing to the high hydrophilicity of GO-IL components. Moreover, the GO-IL-CNT-AuNPs hybrid nanocomposites with excellent conductivity were obtained conveniently by introducing IL, CNT, AuNPs with good conductivity materials. Seeing that there is a good synergistic effect between materials in enhancing preconcentration efficiency of BPA and accelerating electron transfer rate at electrode/electrolyte interface, the hybrid nanocomposites fabricated electrochemical sensor possess fast, stable and sensitive detection performance for trace amounts of BPA. Differential pulse voltammetry was used as a sensitive analytical method for the determination of BPA, and a much wider linear dynamic range of BPA determination was found between 5 nM and 100 nM. The limit of detection for BPA was found down to 1.5 nM based on S/N=3. The modified electrode was successfully employed to detect of BPA extracting from plastic water bottle and milk carton.
EN17081 Accepted 25 July 2017
© CSIRO 2017