Fabrication and electrochemical characterization of interdigitated nanoelectrode arrays |
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| Affiliation: | 1. State Key Laboratory for Physical Chemistry of Solid Surfaces and Chemistry Department, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen, Fujian 361005 China;2. Zhejiang Key Laboratory for Reactive Chemistry on Solid Surfaces, Institute of Physical Chemistry, Zhejiang Normal University, Jinhua, Zhejiang 321004 China;3. UMR CNRS 8640 «PASTEUR», Ecole Normale Supérieure, Université Pierre et Marie Curie-Paris 06, 24 rue Lhomond, 75231 Paris Cedex 05, France;1. Birck Nanotechnolgy Center, Purdue University, West Lafayette, IN 47907, USA;2. Materials and Manufacturing Directorate, Air Force Research Laboratory, WPAFB, OH 45433, USA;3. Department of Mechanical Engineering, Purdue University, West Lafayette, IN 47907, USA;1. General Engineering Research Institute, Liverpool John Moores University, Liverpool, L3 3AF, UK;2. Biomer Technology LTD, 10 Seymour Court, Tudor Road, Manor Park, Runcorn, Cheshire, WA7 1SY, UK |
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| Abstract: | Interdigitated nanoelectrode arrays with controlled electrode bandwidth and gap geometries ranging from 30 nm to 1 μm were fabricated on glass substrates by a planar process involving high resolution electron beam lithography and lift-off, and their characteristic electrochemical responses to an aqueous ferrocene derivative solution were examined using fundamental electrochemical techniques. Despite the comparatively large electrode area of electrode arrays containing 10 bands to a single band electrode, quasi-steady-state currents with high current density were obtained at a slow potential sweep rate in cyclic voltammograms of ferrocene derivative since the lateral dimension of the nanoelectrode arrays was considerably less than the scale of the diffusion layer of redox species. Additionally, it was demonstrated that the electrode thickness influenced limiting currents of voltammograms in the case of nanoelectrode arrays. In generation-collection mode experiments, furthermore, a collection efficiency as high as ∼99% was attained by 100 nm wide electrode arrays with a gap dimension of 30 nm. |
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