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 sp2 carbon atoms compared with DLC film, and the redox reaction of K3Fe(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.