Preparation And Catalytic Performance Of Copper-Based Nanowire Array By Template Method

Matrix structure three-dimensional nanoarray exhibit excellent performance in the field of sensitization,electrocatalysis and optoelectronics owing to the special uniform structure in nano level that has high specific surface area and facilitates the exchange of materials.In this paper,Cu-based nanoarray materials are prepared by in-situ deposition on surface of copper substrate by cyclic voltammetry(CV)method with polycarbonate(PC)template and anodic aluminum oxide(AAO)template used as auxiliary deposition templates.Field emission scanning electron microscopy(FESEM),transmission electron microscopy(TEM)and X-ray diffractometer(XRD)are utilized to characterize the morphology and phase structure of Cu-based nanoarrays.With AAO as template,Cu nanowires array is synthesized and the nanowires are60 nm in diameter,2?m in length with a large aspect ratio.The unilateral Cu nanowires array and bifacial Cu nanowires array are fabricated by PC template.FESEM images shows that the yiled Cu nanowires posses uniform geometry with the diameter of ~200 nm and the length of 3~5?m.XRD spectra shows that the Cu nanowires array has face-centered cubic structure,and the Cu nanowires grow along(111)plane due to the limiting effect of template.The sensitizing activity of Cu nanowires array on glucose is tested by electrochemical workstation with unilateral Cu nanowires array and bifacial Cu nanowires array used as electrode without further processing.The results show that Cu-based nanoarray shows excellent sensitivity in glucose detection.The detection limit of glucose concentration for bifacial Cu nanowires array is significantly lower than that of unilateral Cu nanowires array with a minimum detection concentration of 0.2 mM and maintains high stability and reproducibility in the reuse process.By using replacement reaction,a layer of palladium(Pd)is deposited on surface of Cu nanowires array to obtain Cu-Pd ordered nanowires array.After loading Pd,the Cu-Pd nanowires array still maintains ordered array structure just like the Cu nanowires array on substrate,and the diameter of Cu-Pd nanowires is 200 nm,but the surface of Cu-Pd nanowires becomes rougher than that of as-prepared Cu nanowires.In electrocatalytic oxidation of ethanol experiments,a characteristic oxidation peak will be formed in flyback-0.4V position.The Cu-Pd nanowires array exhibits the best catalytic activity when the time of replacement reaction is 10 mins and remains highly catalytic activity for ethanol electrolytes while the concentrations is as low as 0.2 M.