QUATERNIZED CHITOSAN MEDIATED ASSEMBLY OF GOLD NANOPARTICLES MULTILAYERS

M. V. BRACAMONTE; O. E. LINAREZ PÉREZ; M. LOPEZ TEIJELO; G. A. RIVAS; N. F. FERREYRA

ELECTROCHIMICA ACTA

PERGAMON-ELSEVIER SCIENCE LTD

Año: 2014 vol. 146 p. 178 - 178

0013-4686

elf-assembled multilayers of quaternized chitosan (QCHI) and gold nanoparticles (AuNPs) were built up on quartz and gold substrates. To evaluate the effect of the surface coverage of AuNP on the structural, optical and electrochemical properties of AFM characterization multilayers prepared with different AuNPs adsorption time were compared. UV-Vis and indicated that AuNPs in each bilayer are spatially separated, and interparticle interactions are mainly produced between bilayers. The complex refractive index and thickness of the QCHI-AuNPs multilayers were properly determined using an anisotropic single layer model. The optical constants obtained were quite different from those of bulk gold, and their values depend on the coverage of AuNPs. The thickness per bilayer of the structures present a progressive increase as AuNP´s coverage augments, reaching a value close to the nominal AuNPs diameter after 60 min of adsorption. These results indicate that the interpenetration of