Abstract
A nonenzymatic voltammetric assay for dopamine (DA) was developed based on the combination of three-dimensional graphene (3D Gr) and indium oxide nanosheet arrays (In2O3 NSAs). 3D Gr was prepared by chemical vapor deposition (CVD), and In2O3 NSAs were grown on its surface by hydrothermal synthesis. The results show that 3D Gr maintains a good porous structure (200μm), and the pore size of In2O3 NSAs is 0.50μm. Differential pulse voltammetry (DPV) is mainly used to determine the electrochemical properties of In2O3 NSAs/3D Gr. It possesses a sensitivity of 2.69μA·μM-1·cm-2 towards DA (5-60μM) at 0.14V, and the detection limit (LOD) is 0.10μM (S/N = 3). The recoveries obtained forspiked samples in the real sample detection is 105 (± 8)%. Graphical abstractSchematic representation of DA sensitive detection by growing In2O3 nanosheets arrays on three-dimentional graphene modified ITO.
Published Version
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