Voltammetric Performance of Nanometer Interdigitated Electrodes

X. Yang1, and G. Zhang1,2
1Micro/Nano Bioengineering Laboratory, Faculty of Engineering, The University of Georgia, Athens, GA, USA
2Nanoscale Science and Engineering Center, Faculty of Engineering, The University of Georgia, Athens, GA, USA

To explore the use of nanometer-scale interdigitated electrodes (IDEs) in affinity-based biosensors, we investigated the voltammetric behavior of interdigitated electrodes (IDEs) at various electron-transfer-rate constants (i.e., the k0 values) with the consideration of electrical double layer (EDL), and the relationship between the limiting current density and k0 value.

Results show that the presence of the EDL alters the electron-transfer behavior and current response of nano-IDEs. The relationship between the limiting current density and k0 value varies with the charge valences of a particular redox species. With the same nano-IDEs, different sensing performances can be achieved by using redox species with different charge valences.

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