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李相欣,鄭琪謨,曺辰鎬 慶北大學校 醫科大學 1989 慶北醫大誌 Vol.30 No.1
In this paper, the electrical characteristics of microelectrode-3mol KCl electrolyte interface was investigated upon increasing current density at 3 different frequencies(100, 1000 and 10,000 Hz). Metaltip microelectrode and micropipet electrode of thin stainless steel wire or Ag-AgCl wire were prepared and experiment circuit was set up to acquire their series-equivalent capacitance and rectification properties. Consequently, it was found that the resistance of microelectrode was decreased with increasing current density but capacitance was increased. At higher frequency, resistance and capacitance have tendency to decrease, resistance and impedance of micropipet electrode were remarkably larger than those of metal-tip microlectrode but capacitance was smaller. Stainless steel microelectrode had higher threshold current density as frequency was increased showing obvious rectification property. Ag-AgCl microelectrode was found to have good characteristics showing no rectification property.