Zusammenfassung
Polycrystalline gold electrode surface spontaneously modified by
1,4-dithiane (1,4-dt) organosulfur species was characterized by rotating
disk electrode (RDE) and electrohydrodynamic impedance (EHD) using
Fe(CN)(6)(3-) as the electrochemical probe molecule. The gold(1 1 1)
monocrystal surface was also modified with 1,4-dt to assess the surface
morphology by atomic force microscope (AFM). The electrochemical
measurements showed that the polycrystalline gold surface modified with
1,4-dt exhibits a typical behavior of a partially blocked surface and
that the blocking effect increases with the increase of the immersion
time in the precursor solution. The AFM image clearly shows the presence
of defects on the modified surface. Even for a high immersion time (72
h) the electrode surface was not entirely blocked. The surface roughness
of the Au/1,4-dt is approximately three times greater than the surface
roughness of the bare-gold electrode. (c) 2007 Elsevier B.V. All rights
reserved.
Nutzer