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Title: Ionic double layer of atomically flat gold formed on mica templates.
Authors: Chilcott, TC
Wong, ELS
Coster, HGL
Coster, ACF
James, M
Keywords: Ionic Composition
Atomic Force Microscopy
Issue Date: 30-May-2009
Publisher: Elsevier
Citation: Chilcott, 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.
Abstract: Electrical 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.
ISSN: 0013-4686
Appears in Collections:Journal Articles

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