▎ 摘　　要

An electrochemical sensor based on gold nanoparticals (Au) doping graphene sheets (GS) nanocomposites sensitized screen-printed carbon electrode (SPCE) as a disposable platform was developed for voltammetric determination of guaiacol (IUPAC name, 2-methoxyphenol) in bamboo juice. The SPCE was first modified by a dispersed solution of GS-Nafion (Nf), which was followed by electroless plating of Au on the surface to fabricate SPCE vertical bar GS-Nf/Au electrode. X-ray powder diffractometer (XRD), electrochemical impedance spectroscopy (EIS) and scanning electron microscopy (SEM) were employed to characterize the synthesized GS and the construction processes of the modified electrode. The determination of guaiacol at the modified electrode was studied by cyclic voltammetry (CV) and differential pulse voltammetry (DPV) in the phosphate buffer solution (PBS). Under the optimum experimental conditions, the peak currents obtained at +0.22 V from DPV were linearly dependent on the guaiacol concentrations in the range of 1.0x10(-7) mol/L to 1.5x10(-5) mol/L. The detection limit (3 sigma) was 5.4x10(-8) mol/L. The proposed modified electrode is sensitive, rapid, simple and disposable. In addition, the proposed sensor showed satisfactory recovery results toward the commercial bamboo juice samples.