A Newly Fabricated Electrochemical Sensor for Apomorphine Detection in Human Plasma
Abstract
The electronic properties of thermally grown oxide films on 304 L stainless steel at 300°C were investigated by local and global electrochemical based methods. This study shows that both approaches are complementary and each of them offers additional features. Thermally grown oxide films on stainless steel were investigated with electrochemical impedance spectroscopy. Conventional and localized electrochemical measurements were performed. The impedance diagrams were evaluated by means of an enhanced graphical representation. The power law model was applied to establish the resistivity distribution across the oxide film at the open circuit potential and under bias. The resistivity distribution profiles through the oxide film are more marked by a power-law decay. The oxide film and space charge layer thicknesses have been estimated from the high-frequency capacitance values established from the complex capacitance representation regardless of the type of time constant distribution in the oxide. The oxide film exhibits both n-type and p-type semiconductor character. Photoelectrochemical measurements performed on this material provide energy spectra displaying different contributions corresponding to different types of oxide. Furthermore, photocurrent images recorded at different energies show distinct contrasting regions of the photocurrent, illustrating the micron scale distribution of the important semiconducting phases.
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