Publication: Microelectrode arrays with active-area geometries defined by spatial light modulation
Authors
Vogel, Yan B. ; Molina, Angela ; González Sánchez, Joaquín ; Ciampi, Simone
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Publisher
Elsevier
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Description
© 2020 Elsevier Ltd. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/
This document is the Accepted Manuscript version of a Published Work that appeared in final form in Electrochimica Acta. To access the final edited and published work see https://doi.org/10.1016/j.electacta.2020.136849
Abstract
Microelectrode arrays form the basis of electrochemical sensing devices because of their unique properties, such as enhanced mass transport and steady-state diffusion currents. However, they demand a predefined and rigid geometry, and require a connecting pad for each element of the array. Here it is reported the formation of microelectrode arrays whose active area geometry is defined by the shape of a light pattern projected on an unstructured silicon electrode with a single electrical connection. Spatiotemporally resolved fluxes of charge carriers are used to confine a model electrochemical reaction only to the illuminated areas. By developing a theoretical model to analyze the current−potential data, it is revealed within which limits spatial light modulation can be used to enhance mass transport in a diffusive redox system on two silicon allotropes. Using this concept microelectrode geometry is adjusted instantaneously and at will by the operator on a homogeneous substrate with a single electrical connection.
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