INVESTIGADORES
CALVO Ernesto Julio
artículos
Título:
Adsorption kinetics of charged thiols onto gold nanoparticles
Autor/es:
M. BELLINO,; EJ CALVO; G. GORDILLO,; ERNESTO JULIO CALVO
Revista:
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
Referencias:
Año: 2004 vol. 6 p. 424 - 428
ISSN:
1463-9076
Resumen:
Colloidal Au nanoparticles have been functionalized with mercaptopropane sulfonate (MPS) and
mercaptoethylamine (MEA) short alkanethiols in aqueous solutions. Adsorption kinetics of these charged
thiols onto gold nanoparticles has been followed by the decrease in the surface plasmon band at 530 nm due to
the red shift caused by particle-to-particle aggregation. Titration curves resulted from plotting the 530 and 800
nm-absorbance versus the added amount of thiol in solution, and yielded the mercaptane coverage on Au.
While the adsorption of positively charged MEA on negatively charged Au colloid is very rapid, slower and
more complex adsorption kinetics have been found for the negatively charged MPS.versus the added amount of thiol in solution, and yielded the mercaptane coverage on Au.
While the adsorption of positively charged MEA on negatively charged Au colloid is very rapid, slower and
more complex adsorption kinetics have been found for the negatively charged MPS.