Microfabrication and characterization of cylinder micropillar array electrodes

作者：Prehn Ricard; Abad Llibertat; Sanchez Molas David; Duch Marta; Sabate Neus; del Campo F Javier^*; Munoz Francesc Xavier; Compton Richard G

来源：Journal of Electroanalytical Chemistry, 2011, 662(2): 361-370.

DOI：10.1016/j.jelechem.2011.09.002

• Microfabrication
• Electrochemistry
• Micropillar array electrodes
• Diffusion domain approach
• Microelectrodes

This work describes de fabrication, using standard microfabrication techniques, of cylindrical micropillar array electrodes. The work also describes the characterization of these electrodes using a combination of microscopy techniques, cyclic voltammetry and finite-element simulations based on the diffusion domain approach. The work shows that while micropillar array electrodes display currents consistent with the Randles-Sevcik equation at low scan rates, they afford enhanced voltammetric peak currents at higher scan rates. Not only this, but for certain micropillar geometries and densities, simulations predict that a voltammetric peak-to-peak separations below 57 mV due to thin-layer diffusion effects. The results presented in this article are in agreement with recent works by Compton and co-workers on porous and rough electrodes, and provide further evidence of the validity of the diffusion domain approach to predict and interpret mass transport controlled currents at microstructured electrodes.

• 出版日期2011-11-15