Quaternized chitosan mediated assembly of gold nanoparticles multilayer

O. E. LINAREZ PÉREZ

ELECTROCHIMICA ACTA

PERGAMON-ELSEVIER SCIENCE LTD

Lugar: Amsterdam; Año: 2014 vol. 146 p. 178 - 178

0013-4686

elf-assembled multilayers of quaternized chitosan (QCHI) and gold nanoparticles (AuNPs) were built upon quartz and gold substrates. To evaluate the effect of the surface coverage of AuNPs on the structural,optical and electrochemical properties of multilayers prepared with different AuNPs adsorption timewere compared. UV-Vis and AFM characterization indicated that AuNPs in each bilayer are spatiallyseparated, and inter particle interactions are mainly produced between bilayers. The complex refractiveindex and thickness of the QCHI AuNPs multilayers were properly determined using an anisotropic singlelayer model. The optical constants obtained were quite different from those of bulk gold, and their valuesdepend on the coverage of AuNPs. The thickness per bilayer of the structures present a progressiveincrease as AuNP?s coverage augments, reaching a value close to the nominal AuNPs diameter after 60 minof adsorption. These results indicate that the interpenetration of bilayers in the st