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dc.contributor.author
Walsh, Darren A.
dc.contributor.author
Fernandez, Jose Luis
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dc.contributor.author
Mauzeroll, Janine
dc.contributor.author
Bard, Allen J.
dc.date.available
2020-04-14T12:51:12Z
dc.date.issued
2005-08
dc.identifier.citation
Walsh, Darren A.; Fernandez, Jose Luis; Mauzeroll, Janine; Bard, Allen J.; Scanning Electrochemical Microscopy. 55. Fabrication and Characterization of Micropipet Probes; American Chemical Society; Analytical Chemistry; 77; 16; 8-2005; 5182-5188
dc.identifier.issn
0003-2700
dc.identifier.uri
http://hdl.handle.net/11336/102431
dc.description.abstract
The fabrication and characterization of novel micropipette probes for use in scanning electrochemical microscopy (SECM) are described. These can be used to dispense small (pL) amounts of a solution while monitoring the electrochemical response at a substrate and at a ring electrode tip on the micropipet probe. The probes were constructed by insulating gold-coated borosilicate micropipets with electrophoretic paint and exposing a ring electrode at the tip by heat treatment. Characterization of the probes was performed using scanning electron microscopy, cyclic voltammetry, and SECM approach curve experiments. Routine construction of tips with diameters of the order of 3 ím was possible using this technique. The probes exhibited stable steady-state currents and positive and negative feedback approach curves that agreed with those predicted by theory. Demonstrative SECM imaging experiments were performed using a picodispenser to continuously dispense an electroactive solution (ferrocenemethanol) to the SECM cell while the probe was located within a few micrometers of a Pt substrate surface. Oxidation of the dispensed electroactive solution was performed at the substrate, and feedback currents were measured at the probe tip by holding the gold ring at a reducing potential. This mode of tipdispensing SECM was used to obtain images of a platinum substrate electrode while monitoring both the substrate current and the feedback current at the probe.
dc.format
application/pdf
dc.language.iso
eng
dc.publisher
American Chemical Society
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dc.rights
info:eu-repo/semantics/openAccess
dc.rights.uri
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.subject.classification
Físico-Química, Ciencia de los Polímeros, Electroquímica
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dc.subject.classification
Ciencias Químicas
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dc.subject.classification
CIENCIAS NATURALES Y EXACTAS
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dc.title
Scanning Electrochemical Microscopy. 55. Fabrication and Characterization of Micropipet Probes
dc.type
info:eu-repo/semantics/article
dc.type
info:ar-repo/semantics/artículo
dc.type
info:eu-repo/semantics/publishedVersion
dc.date.updated
2020-04-13T13:17:51Z
dc.journal.volume
77
dc.journal.number
16
dc.journal.pagination
5182-5188
dc.journal.pais
Estados Unidos
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dc.description.fil
Fil: Walsh, Darren A.. University of Texas at Austin; Estados Unidos
dc.description.fil
Fil: Fernandez, Jose Luis. Universidad Nacional del Litoral. Instituto de Química Aplicada del Litoral. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Santa Fe. Instituto de Química Aplicada del Litoral.; Argentina
dc.description.fil
Fil: Mauzeroll, Janine. University of Texas at Austin; Estados Unidos
dc.description.fil
Fil: Bard, Allen J.. University of Texas at Austin; Estados Unidos
dc.journal.title
Analytical Chemistry
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dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/doi/http://dx.doi.org/10.1021/ac0505122
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