Microelectrode arrays with active-area geometries defined by spatial light modulation
© 2020 Elsevier 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...
| Main Authors: | , , , |
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| Format: | Journal Article |
| Published: |
2020
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| Online Access: | http://purl.org/au-research/grants/arc/DP190100735 http://hdl.handle.net/20.500.11937/80748 |
| Summary: | © 2020 Elsevier
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 geometry is defined by the shape of a light pattern projected on an unstructured silicon electrode. Spatiotemporally resolved fluxes of charge carriers are used to confine a model electrochemical reaction only to the illuminated areas. Using spatial light modulators, microelectrode geometry is adjusted instantaneously, at will, on a homogeneous semiconductor electrode carrying a single electrical connection. By developing a theoretical model to analyse the current−potential data, it is revealed within which limits spatial light modulation can be used to enhance, on silicon, the mass transport of a diffuse redox system. |
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