1. Altered Spatial Resolution of Scanning Electrochemical Microscopy Induced by Multifunctional Dual-Barrel Microelectrodes.
- Author
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Stephens, Lisa I. and Mauzeroll, Janine
- Subjects
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SCANNING electrochemical microscopy , *MICROELECTRODES , *ELECTROLYTES , *DIFFUSION , *COMPUTER simulation - Abstract
The nonuniform diffusion profile to the edge of many multifunctional microelectrodes has the potential to give rise to distortions in its imaging capability, reducing the spatial accuracy of the techniques they are used in. In this work, numerical simulations are used to predict these distortions for dual-barrel electrodes used in the combined feedback/ generation-collection mode of scanning electrochemical microscopy imaging a model substrate. The sensitivity of this distortion to tip-substrate distance, electrolyte composition, and size and shape of a reactive substrate feature are discussed. Multifunctional microelectrodes have promising applications in the field of high-speed electrochemical imaging, allowing local in situ measurements of kinetics, pH, and topography to be performed consecutively rather than concurrently.1,2 The challenges associated with aligning microscopy techniques are eliminated by integrating multiple electrodes (probes) into the same sensor. A broad range of multifunctional probe geometries have been fabricated, including modified AFM tips,3-5 crescent moons,6-8 multibarrel, 9-14 and disk15,16 geometries, that are suitable for tandem techniques involving scanning electrochemical microscopy (SECM),14,17 scanning ion conductance microscopy (SICM), 2 , 6-8 ,10-13,17 scanning dropl e t methods (SDM),9,10,15,18 atomic force microscopy (AFM),1,3,4,19,20 and others.15 These techniques have been used to study substrates such as nanoparticles and nanocrystals,10,11,13,18 corroding materials,5,21 single-membrane pores,3,4,8,17 and biological samples.12,14,16,19 Despite this extensive development in multifunctional microelectrodes, the relationship between probe shape and response remains underdeveloped for multifunctional microelectrodes outside of discussions of probe size. [ABSTRACT FROM AUTHOR]
- Published
- 2018
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