Artikel,
Thionicotinamide SAM on Gold: Adsorption Studies and Electroactivity
ELECTROANALYSIS, 21 (9): 1081-1089 (2009)
DOI: 10.1002/elan.200804503
Zusammenfassung
STM and impedance results of the self-assembled monolayer (SAM) formed
with thionicotinamide (TNA) on gold indicate the presence of defects
that increase with the immersion time of the electrode in the TNA
solution affecting the SAM electroactivity toward the electron transfer
reaction of the cytochrome e metalloprotein and Fe(CN)(6)(4-) and
Ru(NH3)(6)(3+) complexes. It was observed that this electroactivity
was also affected by the pH of the electrolyte solution. SERS and STM
data indicate sulfur coordination to the surface with contribution of
the NH2 group. From the dependence of the TNA surface coverage on the
temperature and concentration in solution, thermodynamic parameters of
adsorption were determined.
