研究領(lǐng)域：神經(jīng)生物醫(yī)學(xué)+微電極 交流阻抗頻率范圍：1MHz - 0.1Hz
Electrode-electrolyte impedance is one of important characteristic for neural recording applications
due to its influence on the signal/noise ratio and signal distortion. In this work a model of the
electrode-electrolyte is described and validated through electrochemical impedance spectroscopy
technique (EIS), using commercial platinum and platinum/iridium alloy microelectrodes used in acute
neural recording. The impedance of the electrodes was measured in standard physiological saline
solution (0.9% NaCl). A two electrode setup was used in which the working electrode was connected
to the microelectrodes and the counter electrode was short-connected to the reference (stainless
steel). The data was collected using an electrochemical analyzer (CompactStat,
IviumTechnologies).In order to address the behavior of the electrode impedance an equivalent circuit
of the electrode/electrolyte interface has been modeled. Since the impedance is strongly dependent
on the electrode area, electrochemical characterization of the area was also performed using a
standard iron ferricyanide solution K3Fe(CN)6.
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