facile decoration of graphene oxide with cu(ii)/1h-benzotriazole complex via π–π interaction for sensitive determination of hydrogen peroxide and hydroxylamine

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 π–π 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 μm–2.15 mm and 1.0 μm–1.0 mm, respectively. the limit of detection (lod) for the determination of h2o2 and ha is 0.1 μm and 0.31 μm, 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.