▎ 摘　　要

Cu(II) and 1H-benzotriazole (BTA) formed stable complex, denoted as Cu-BTA, in aqueous solution. Cu-BTA can be easily anchored on the surface of graphene oxide (GO) via pi-pi stacking interaction. The obtained nanocomposite of Cu-BTA and GO, denoted as Cu-BTA@GO, was characterized with cyclic voltammetry (CV) and Fourier transform infrared spectroscopy (FT-IR) and scanning electron microscopy (SEM). Cu-BTA@GO and multiwalled carbon nanotube (MWCNT) were used to modify glassy carbon electrode (GCE). The obtained modified electrode, denoted as Cu-BTA@GO/MWCNT/GCE, exhibited excellent catalytic capability toward the reduction of hydrogen peroxide and the oxidation of hydroxylamine (HA). Cu-BTA@GO/MWCNT/GCE presents wide linear range for the determination of H2O2 and HA, which is 1.0 mu M-2.15 mM and 1.0 mu M-1.0 mM, respectively. The limit of detection (LOD) for the determination of H2O2 and HA is 0.1 mu M and 0.31 mu M, respectively. The large electroactive surface area and the extraordinary electrocatalytic capability of Cu-BTA@GO/MWCNT/GCE are probably due to the combination of Cu-BTA/GO and MWCNT.