Polymerized ionic liquid functionalized graphene oxide nanosheets as a sensitive platform for bisphenol A sensing

A novel electropolymerizable material, 1-[3-(N-pyrrolyl) propyl]-3-butylimidazolium bromide (NPBimBr) ionic liquid, was synthesized and used as a modifier to functionalize graphene oxide nanosheets (GO) for fabricating an electrochemical sensor. X-ray photoelectron spectroscopy, transmission electron microscopy, scanning electron microscopy and electrochemical impedance spectroscopy were used to characterize both GO-NPBimBr and GO-poly(NPBimBr) film electrode. Electrochemical performance in the detection of bisphenol A at the GO-poly(NPBimBr) modified glassy carbon electrode (GCE) was investigated and optimized. Compared with the bare GCE, the oxidation peak current of bisphenol A at the nanocomposite film modified electrode was significantly increased. A good linear relationship between the oxidation peak current and the bisphenol A concentration was found in the range of 2.0 x 10(-7) similar to 1.0 x 10(-5) mol L-1, with a detection limit of 1.7 x 10(-8) mol L-1. The method was successfully applied to determine bisphenol A content in commercially available plastic drinking cups and the results are consistent with the ones from high performance liquid chromatography. (c) 2017 Elsevier Ltd. All rights reserved.