Direct Electrodeposition to Fabricate 3D Graphene–Carbon Nanotubes Network Modified Electrode for Sensitive Electrochemical Determination of Maltol

Abstract

In this work, pulse potential method (PPM) was presented to fabricate directly three dimensional graphene-carbon nanotubes (3DG-CNTs) network on the surface of glassy carbon electrode (GCE). The morphological and characteristic of 3DG-CNTs network were investigated by means of Raman spectra, scanning electron microscopy (SEM) and electrochemical experiments. The 3DG-CNTs network as a new voltammetric material was applied in developing a high-sensitive electrochemical sensor for determination of maltol. Under the optimum conditions, the electrochemical response showed a linear relationship with maltol concentrations in the range of 5.0 × 10−8 ∼ 4.5 × 10−6 mol L−1 and 1.0 × 10−5 ∼ 2.0 × 10−3 mol L−1, and a low detection limit of 1.0 × 10−8 mol L−1 was achieved for maltol. Moreover, the proposed method exhibited an excellent selectivity, stability, reproducibility and repeatability, which make it very suitable for a potential choice for determination of maltol in food matrices.