Adsorption kinetics of charged thiols on gold nanoparticles

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 d...

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Detalles Bibliográficos
Autores principales: Bellino, M.G., Calvo, E.J., Gordillo, G.
Formato: JOUR
Materias:
gold
mercaptopropane
propane
thiol derivative
unclassified drug
addition reaction
adsorption kinetics
aqueous solution
article
colloid
complex formation
electric potential
electricity
molecular interaction
molecular mechanics
nanoparticle
reaction analysis
surface property
titrimetry
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_14639076_v6_n2_p424_Bellino
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
Descripción
Sumario: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.

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