Abstract
The sub-μm interdigitated microelectrodes presented in this work aims at achieving a high collection efficiency for electrochemical dopamine (DA) detection. Through nanoimprint technology, sub-μm microelectrodes can be batch fabricated without relying on the expensive electron-beam lithography repeatedly. The applied reduction and oxidation potentials are determined by cyclic voltammetry at −0.2 V and 0.6 V. The effectiveness of nanoimprinted electrodes is clearly illustrated by the small deviations of produced electrochemical currents with respect to analytic values. The sensitivities are 2.89 and 1.73 nA/μM for interdigitated microelectrodes with gaps of 300 and 600 nm. The average collection efficacy values are 97.9% and 95.4%, respectively. Signal transduction is achieved by a CMOS sensing circuit. The detectable resolution is about 0.1 μM.
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