Browsing by Subject "Monolayers on silicon"
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- PublicationOpen AccessMicroelectrode arrays with active-area geometries defined by spatial light modulation(Elsevier, 2020-10-01) Vogel, Yan B.; Molina, Angela; González Sánchez, Joaquín; Ciampi, Simone; Química FísicaMicroelectrode 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.