▎ 摘　　要

In this report, graphene-gadolinium hydroxide (GR-Gd(OH)(3)) nanocomposites have been prepared using the hydrothermal process. The crystalline structures of GR-Gd(OH)(3) have been determined by X-ray diffraction (XRD) measurements and their morphologies have been revealed by field-emission scanning electron microscopy (FE-SEM) observations. The optical properties of GR-Gd(OH)(3) have been examined by UV-vis and Fourier transform infrared (FTIR) measurements which revealed mutual interactions between GR and Gd(OH)(3). GR-Gd(OH)(3) was used to modify the glassy carbon electrode (GCE) which was subsequently utilized for electro-oxidation of ascorbic acid (AA) by cyclic voltammetry method. It was found that the electro-catalytic behavior of GCE modified by GR-Gd(OH)(3) (GCE/GR-Gd(OH)(3)) was superior to that of the bare GCE. The catalytic oxidation peak current showed a linear dependence on the AA concentration and a linear calibration curve was obtained in the concentration range of 0.1-2.5 mM of AA with the lowest limit of detection (LOD) of 0.06 mM. Simultaneously, the oxidation peaks of AA over GCE/GR-Gd(OH)(3) shifted to lower over potential compared to that of GCE modified by Gd(OH)(3) (GCE/Gd(OH)(3)). The results indicate that GR-Gd(OH)(3) can be used as a promising electrode modifier, which offers a new promising platform for application of the rare earth compound in electrochemistry and bioelectronics. Synchronously, the controlled synthesis of GR-Gd(OH)(3) opens an efficient and facile strategy to design other GR-based, rare earth-containing nanocomposites.