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Investigation into Charge Transport Dynamics of [Os(bpy) 2 (picolinate)]Cl Nafion Films
Author(s) -
Warren Susan,
McCormac Timothy,
Mihaylova Emilia Mitkova,
Dempsey Eithne
Publication year - 2006
Publication title -
electroanalysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.574
H-Index - 128
eISSN - 1521-4109
pISSN - 1040-0397
DOI - 10.1002/elan.200603583
Subject(s) - chronoamperometry , redox , electrochemistry , diffusion , analytical chemistry (journal) , electrolyte , conductivity , nafion , carbon nanotube , supporting electrolyte , chemistry , materials science , inorganic chemistry , cyclic voltammetry , electrode , nanotechnology , organic chemistry , thermodynamics , physics
This work examines the charge transport properties of redox films of the immobilized enzyme mediator [Os(bpy) 2 (picolinate)]Cl ([Os(bpy) 2 Pic] + ). Chronoamperometry was used to calculate D CT values (typically of the order of 1.5×10 −8 cm 2 s −1 ) and the effect of % loading of redox material was determined for three electrolytes over a range of concentrations. The data obtained implies that charge transfer within the film occurs via a redox site diffusion mechanism. The concentration of redox sites was determined using an approximate film thickness of 7 μm, as determined from profilometry studies. Experiments were also performed using immobilized carbon nanotubes within the redox film in order to examine the impact of the increased surface area and conductivity. The presence of the carbon nanotubes had the effect of doubling the surface coverage values and enhancing D CT 1/2 C M values from 1.9×10 −9 to 16.1×10 −9 mol cm −1 s −1 .