Oxidation Behavior of Glucose on Platinized Diamond-like Carbon Film Electrode

In order to improve the electrochemical activity of conductive diamond-like carbon(DLC) film,platinized DLC(DLC-Pt) film was prepared by magnetron co-sputtering of graphite and platinum targets.The compositions and microstructures of DLC-Pt film were investigated by X-ray photoelectron spectroscope and Raman spectroscope,and the oxidation behaviors of glucose at the DLC-Pt film surface were examined by cyclic voltammetry.The results indicate that DLC-Pt film has more sp~2 carbon atoms compared with DLC film,and the redox reaction of K_3Fe(CN)_6 on the DLC-Pt film electrode is controlled by diffusion.The glucose oxidation starts at about -0.8 V on the DLC-Pt film surface without interference from urea and ascorbic acid.A linear detection range of glucose obtained on the DLC-Pt electrode is identified from 2 mmol/L to 22 mmol/L(covering blood glucose levels in diabetic patients).So the DLC-Pt film has potential application to be a glucose sensor for blood glucose defection.