Co(OH) nanosheets decorated Cu(OH) nanorods for highly sensitive nonenzymatic detection of glucose.

Co(OH) nanosheets/Cu(OH) nanorods composite electrodes for non-enzymatic glucose detection were fabricated by electrodepositing Co(OH) nanosheets on Cu(OH) nanorods substrate grown directly on the copper sheet via a simple one-step reaction. The Co(OH) nanosheets/Cu(OH) nanorods composite electrode was characterized by scanning electron microscopy, energy dispersive x-ray spectroscopy, x-ray diffraction and x-ray photoelectron spectroscopy. The glucose sensing performance of the composite electrode was investigated by cyclic voltammetry and chronoamperometry. The composite electrode shows high sensitivity of 2366 µA mM cm up to 2 mM with a lower detection limit of 0.17 mM (S/N = 3). The composite electrode is highly selective to glucose in the presence of various substances that always co-exist with glucose in real blood samples. The response of the composite towards human blood serum was in good agreement with that of commercially available glucose sensors, suggesting that a promising electrode material for highly sensitive and selective non enzymatic detection of glucose can be envisioned.