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First- and second-order phase transitions in the adlayer of biadipate on Au(111)

par Doneux, Thomas ;Nichols, Robert Jeremy
Référence PCCP. Physical chemistry chemical physics, 11, 4, page (688-693)
Publication Publié, 2009

Article révisé par les pairs

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Résumé :

The adsorption of biadipate on Au(111) was studied by cyclic voltammetry and chronocoulometry. The biadipate adlayer undergoes a potential-driven phase transition. It is shown that the phase transition can be either of the first- or second-order depending on the biadipate concentration. At low surfactant concentrations, the first-order transition is characterised by a discontinuity in the charge density-potential curve and by the presence of very sharp peaks in the voltammetric response. At higher concentrations, these peaks are no longer observed but a discontinuity in the capacity curve is still noticeable, in agreement with a second-order transition. © the Owner Societies.