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Thionicotinamide SAM on Gold: Adsorption Studies and Electroactivity
Author(s) -
de Freitas Paulo Tércio,
de Oliveira Pinheiro Solange,
Da Silva Maria Aparecida S.,
de França Lopes Luiz Gonzaga,
Pinheiro Lucidalva S.,
Aquino Gil F. A.,
Temperini Márcia Laudelina Arruda,
de Lima Neto Pedro,
Diógenes Izaura Cirino Nogueira
Publication year - 2009
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.200804503
Subject(s) - monolayer , chemistry , adsorption , electron transfer , inorganic chemistry , electrolyte , electrode , electrochemistry , cytochrome c , sulfur , organic chemistry , biochemistry , mitochondrion
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 c metalloprotein and [Fe(CN) 6 ] 4− and [Ru(NH 3 ) 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 NH 2 group. From the dependence of the TNA surface coverage on the temperature and concentration in solution, thermodynamic parameters of adsorption were determined.