Abstract
We demonstrate a facile approach to deposit Pt/IrO2 composite films via a bipolar pulsing deposition technique in which the Pt ions are electrochemically reduced and the IrO2 colloids are electrophoretically deposited. The composite Pt/IrO2 films are subjected to both potential pulse and differential pulse voltammetry to detect the presence of dopamine (DA) and ascorbic acid (AA) for bio-sensing applications. In human’s body, a critical concentration of DA is used as an indicator for onset of Parkinson's disease. Unfortunately, the existence of AA would interfere with the detection of DA due to their similar oxidation potential. By fabricating a composite of Pt and IrO2, a lower detection limit with a minimized interference of DA and AA could be achieved. Electrochemical parameters relevant to the preparation of Pt/IrO2 films are optimized and the resulting morphology and composition are analyzed by SEM and EDS. The oxidation state of Pt and Ir are determined by XPS. The electrical resistance and electrochemical surface area of Pt/IrO2 films are recorded by impedance spectroscopy and electrochemical analysis.
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