MOF derived seaweed-like CoCu oxides nanorod arrays for electrochemical non-enzymatic glucose sensing with ultrahigh sensitivity

Seaweed-like CoCu oxides (Co3O4, CuO and Cu2O) nanorod arrays were synthesized on Cu foam by steps of in-situ growth, including alkaline oxidation of Cu foam, synthesis of CoCu-MOF/Cu2O nanosheets along the obtained Cu(OH)(2) nanorod arrays and annealing of CoCu-MOF/Cu2O. Cu(OH)(2) nanorod array as an idea sacrificial template ensured the growth of well-ordered architecture of CoCu-MOF/Cu2O and MOF-derived CoCu oxides owned porous structure with large surface area. The as-prepared CoCu oxides nanorod arrays modified Cu foam (CoCu oxides/CF) was directly employed as glucose sensing electrode without use of any binders. An ultrahigh sensitivity of 11.916 mu A mu M-1 cm(-2) was obtained by the designed electrode. The excellent sensing performance was attributed to the sufficient catalytic sites of porous nanorod arrays morphology and synergistic effect of the high electrocatalytic activity of multiple metal oxides based binder-free electrode. Besides, good selectivity together with the feasibility in human serum, excellent stability and reproducibility were also obtained by CoCu oxides/CF electrode, indicating that it is promising for practical applications.