Ionic double layer of atomically flat gold formed on mica templates

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dc.contributor.authorChilcott, TCen_AU
dc.contributor.authorWong, ELSen_AU
dc.contributor.authorCoster, HGLen_AU
dc.contributor.authorCoster, ACFen_AU
dc.contributor.authorJames, Men_AU
dc.date.accessioned2009-06-16T03:59:07Zen_AU
dc.date.accessioned2010-04-30T05:03:58Zen_AU
dc.date.available2009-06-16T03:59:07Zen_AU
dc.date.available2010-04-30T05:03:58Zen_AU
dc.date.issued2009-05-30en_AU
dc.date.statistics2009-05-30en_AU
dc.description.abstractElectrical impedance spectroscopy characterisations of gold surfaces formed on mica templates in contact with potassium chloride electrolytes were performed at the electric potential of zero charge over a frequency range of 6 × 10-3 to 100 × 103 Hz. They revealed constant-phase-angle (CPA) behaviour with a frequency exponent value of 0.96 for surfaces that were also characterised as atomically flat using atomic force microscopy (AFM). As the frequency exponent value was only marginally less than unity, the CPA behaviour yielded a realistic estimate for the capacitance of the ionic double layer. The retention of the CPA behaviour was attributed to specific adsorption of chloride ions which was detected as an adsorption conductance element in parallel with the CPA impedance element. Significant variations in the ionic double layer capacitance as well as the adsorption conductance were observed for electrolyte concentrations ranging from 33 [mu]M to 100 mM, but neither of these variations correlated with concentration. This is consistent with the electrical properties of the interface deriving principally from the inner or Stern region of the double layer. © 2009, Elsevier Ltd.en_AU
dc.identifier.citationChilcott, T. C., Wong, E. L. S., Coster, H. G. L., Coster, A. C. F., & James, M. (2009). Ionic double layer of atomically flat gold formed on mica templates. Electrochimica Acta, 54(14), 3766-3774. doi:10.1016/j.electacta.2009.01.069en_AU
dc.identifier.govdoc1260en_AU
dc.identifier.issn0013-4686en_AU
dc.identifier.issue14en_AU
dc.identifier.journaltitleElectrochimica Actaen_AU
dc.identifier.pagination3766-3774en_AU
dc.identifier.urihttp://dx.doi.org/10.1016/j.electacta.2009.01.069en_AU
dc.identifier.urihttp://apo.ansto.gov.au/dspace/handle/10238/1373en_AU
dc.identifier.volume54en_AU
dc.language.isoenen_AU
dc.publisherElsevieren_AU
dc.subjectIonic compositionen_AU
dc.subjectLayersen_AU
dc.subjectMicaen_AU
dc.subjectGolden_AU
dc.subjectSpectroscopyen_AU
dc.subjectAtomic force microscopyen_AU
dc.titleIonic double layer of atomically flat gold formed on mica templatesen_AU
dc.typeJournal Articleen_AU
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