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N. A. MATVEEVSKA, Yu. V. YERMOLAYEVA, Yu. I. PAZYURA, Yu. N. SAVIN, and A. V. TOLMACHOV
«2D-Structures Based on Ensembles of Gold Monodisperse Nanocrystals »
PACS numbers: 42.70.-a, 68.47.Pe, 68.65.Ac, 73.20.Mf, 78.67.-n, 81.16.Dn, 82.70.-y
Parameters of template formation of monolayers of Au nanocrystals (size dispersion ??15%) on the modified quarts wafers are determined. Degree of wafers covering by Au nanocrystals is controlled within the range of 30–80%. Characterization of obtained monolayers is carried out by means of electron microscopy methods, X-ray photoelectron and optical spectroscopies. As shown, the presence of interparticle contacts in the monolayer leads to additional absorption in the spectral range of 600–700 nm along with the main plasmon absorption (537 nm) in the spectrum. Solutions of Au(core)/SiO2(protective shell) heteronanoparticles with required thickness of SiO2 shell (5–50 nm) and mono- and multilayers structures based on these heteronanoparticles are obtained to prevent interparticle contacts in 2D structures. Multilayer structures (with layers number n???1–20) of Au/SiO2 heteronanoparticles are obtained by means of Layer-by-Layer (LbL) assembly method from water solutions. Absorption spectra (plasmon resonance) of 2D structures and their changes with both the geometrical parameters of Au/SiO2 heteronanoparticles and their concentration in the film (with number of coating layers, n) are studied. Obtained 2D structures of Au/SiO2 heteronanoparticles are candidates for new optical and nonlinear optical materials with controllable set of functional properties.