Fabrication of Microelectrode by Screen-Printing and Its Diffusion Impedance

There has been a considerable recent interest in the screen-printing electrodes owing to their promise for a wide range of future technological applications. In this work, a microelectrode was fabricated by screen-printing. Screen-printing has the following characteristics: drawing precise pattern of micron order, a wide variety of inks, printing thick film and low cost. As mentioned above, we think that screen-printing is adequate to fabricate the microelectrode. First, we printed carbon paste as electrode on PET film. And then we printed silver paste to improve the electric conductivity of the electrode. And finally, we printed resist to insulate the part except working electrode and counter electrode. Fleischmann et al solved fick’s law and derived eq. (1) as theoretical equation of microelectrode’s warburg impedance. However equation 1 contains Φ4, Φ5 named tabulated function and this function is difficult to use in simulation. So in this study, we suggest simple expression of microelectrode’s warburg impedance using some electrical units. Figure 3 shows impedance spectrum recorded with the screen-printed microelectrode. In experiment data and simulation data, we can observe charge transfer process in the high frequency religion and diffusion process in low frequency religion. So our original microelectrode’s warburg impedance is availabl