Analytical Sciences

Fabrication of Pt Nanoparticles-decorated CVD Diamond Electrode for Biosensor Applications

Min-Jung SONG, Jong-Hoon KIM, Seung-Koo LEE, and Dae-Soon LIM

School of Material and Science Engineering, Korea University, 1, 5-Ga, Anam-dong, Sungbuk-ku, Seoul 136-713, Korea

An electrochemical biosensor was developed using boron-doped diamond (BDD) as an electrode material. To enhance the electrical performance of the electrode, the BDD electrode was decorated with Pt-nanoparticles (Pt-NPs) by electrochemical deposition. Their morphology according to the applied potentials for the synthesis of Pt-NPs was characterized by SEM. To identify the performance of the electrode modified with Pt-NPs, glucose detection was used as a sample sensing process, and the results were compared with those of a gold electrode and a bare BDD electrode. The electrochemical characteristics of the modified electrode were examined by cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS). The BDD electrode with the Pt-NPs showed higher sensitivity and a lower detection limit than the Au electrode and BDD electrode. The proposed biosensor based on the Pt-NPs decorated BDD electrode showed high sensitivity, a low detection limit, fast direct electron transfer and good stability.

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