Voltammetry of Micro-Liter Electrolyte Samples on ITO Microelectrodes for Analyte Recognition

Amin Jenabi; Ali Hooshyar Zare; Sobhan Erfantalab

doi:10.4028/www.scientific.net/KEM.605.601

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Voltammetry of Micro-Liter Electrolyte Samples on ITO Microelectrodes for Analyte Recognition
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Voltammetry of Micro-Liter Electrolyte Samples on ITO Microelectrodes for Analyte Recognition

Abstract:

Obtaining information on the nature of ionic species in electrolyte samples is in demand. The examination process must take less than ~1 min, and the test is expected to require small volume (micro-liter) samples. Here, we report electrolyte examination results with a simple voltammetry process carried out on thin film indium tin oxide micro-electrodes deposited on polyethylene terephthalate substrates and micromachined by CO₂ laser ablation. The sample volume required is 2 μl, which is dropped manually on the electrodes with a sampler. The voltage waveform applied between the electrodes is a combination of positive and negative pulses of different magnitudes. The transient electric current passing through the electrolyte is monitored and plotted versus time. These plots are utilized as the finger prints of the related electrolyte samples. Pattern recognition methods are employed for information extraction from the obtained patterns. The diagnostic information extracted from these patterns proved sufficient for discrimination among KF, KCl and KI samples at various concentrations.