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Vysotskii V.V.,RAS Frumkin Institute of Physical Chemistry and Electrochemistry | Roldughin V.I.,RAS Frumkin Institute of Physical Chemistry and Electrochemistry | Uryupin O.Ya.,RAS Frumkin Institute of Physical Chemistry and Electrochemistry | Zaitseva A.V.,OOO Inlaif
Colloid Journal | Year: 2011

Conducting properties are studied for deposits that result from evaporating droplets of dispersions of silver nanoparticles with average diameters of 6.2 and 11.9 nm. The deposits represent two ring-shaped structures with diameters of several dozen and several hundred micrometers, which are formed along the perimeter of an evaporating droplet. It is shown that only the external ring-shaped deposit is an electric conductor. The dependence of its conductivity on the content of metal precursor (AgNO 3) in a solution used to synthesize nanoparticles appears to be similar to a percolation transition. Mechanisms of charge transfer in the examined ring-shaped deposit are discussed assuming that it represents a metal-polymer composite. © 2011 Pleiades Publishing, Ltd.


Terekhin V.V.,RAS Frumkin Institute of Physical Chemistry and Electrochemistry | Zaitseva A.V.,OOO Inlaif | Dement'Eva O.V.,RAS Frumkin Institute of Physical Chemistry and Electrochemistry | Rudoy V.M.,RAS Frumkin Institute of Physical Chemistry and Electrochemistry
Colloid Journal | Year: 2013

A new approach to creating highly ordered two-dimensional ensembles of nanoparticles with variable geometric parameters is proposed. It combines diblock copolymer micellar lithography and controlled deformation of a polymer substrate. The key feature of the approach is the formation of a monolayer of hexagonally packed metal precursor-containing micelles of an amphiphilic diblock copolymer on the surface of an isotropically stretched polymer plate. The average distance between micelle centers is 140 nm. Subsequent thermal treatment (or isotropic stretching) of the sample results in the shrinkage (or elongation) of the substrate, which enables one to vary the distance between micelle centers in a range of 80-200 nm while retaining hexagonal packing of the micelles in the monolayer. At the final stage, ensembles of hexagonally ordered gold nanoparticles are obtained by exposing the micellar films to air plasma. It is demonstrated that gold nanoparticles in these ensembles can be enlarged by seeded growth. The systematic study of the plasmon-resonant properties of the resulting ensembles shows that the gradual increase in the distance between 35-nm gold particles from 80 to 200 nm leads to an unexpected nonmonotonic shift of the maximum of localized surface plasmon resonance, which is, from our point of view, caused by the high degree of organization of nanoparticles on the substrate. © 2013 Pleiades Publishing, Ltd.


Terekhin V.V.,RAS Frumkin Institute of Physical Chemistry and Electrochemistry | Dement'Eva O.V.,RAS Frumkin Institute of Physical Chemistry and Electrochemistry | Zaitseva A.V.,OOO Inlaif | Rudoy V.M.,RAS Frumkin Institute of Physical Chemistry and Electrochemistry
Colloid Journal | Year: 2013

Optical spectroscopy and atomic force microscopy are used to study the formation of silver shells on gold nanoparticles in their highly ordered two-dimensional ensembles produced by the method of block copolymer micellar lithography. The shells are synthesized using formaldehyde or hydroquinone as a reducing agent. The spectral characteristics of the nanoparticle ensemble are shown to be essentially sensitive to the silver shell thickness. As a result, working units of solid-state optical sensors for detecting trace amounts of metal ions and different reductants may be created based on highly ordered 2D ensembles of gold nanoparticles. © 2013 Pleiades Publishing, Ltd.


Vysotskii V.V.,RAS Frumkin Institute of Physical Chemistry and Electrochemistry | Roldughin V.I.,RAS Frumkin Institute of Physical Chemistry and Electrochemistry | Uryupina O.Y.,RAS Frumkin Institute of Physical Chemistry and Electrochemistry | Senchikhin I.N.,RAS Frumkin Institute of Physical Chemistry and Electrochemistry | Zaitseva A.V.,OOO Inlaif
Colloid Journal | Year: 2014

The formation of ring-shaped deposits during the evaporation of droplets of silver nanoparticle dispersions on aluminum, copper, and nickel substrates has been studied, and the geometric characteristics and conductivity of the deposits have been determined. The formation process of the deposits on the above substrates has been shown to exhibit some peculiarities to compare with that on hydrophilic glass substrates. These peculiarities lead to substantial differences in the geometric parameters and structure of the deposits formed on substrates of different natures. Therewith, the qualitative regularities of variations in the geometric parameters and conductivity of the deposits with the size (numerical concentration) of silver nanoparticles remain preserved. © 2014, Pleiades Publishing, Ltd.


Vysotskii V.V.,RAS Frumkin Institute of Physical Chemistry and Electrochemistry | Roldughin V.I.,RAS Frumkin Institute of Physical Chemistry and Electrochemistry | Uryupina O.Y.,RAS Frumkin Institute of Physical Chemistry and Electrochemistry | Senchikhin I.N.,RAS Frumkin Institute of Physical Chemistry and Electrochemistry | Zaitseva A.V.,OOO Inlaif
Colloid Journal | Year: 2015

The regularities of the formation of nanocomposites in the form of ring-shaped deposits during the evaporation of dispersions of cube-shaped silver nanoparticles with an average size of 70 nm on hydrophilic (glass) and hydrophobic (copper) substrates have been studied. The nanoparticles have been synthesized by the polyol method in an ethylene glycol solution. In addition, droplets of dispersions of the same nanoparticles in an ethylene glycol/ethanol mixture and water have been experimentally studied. Geometric parameters and conductivity of the formed ring-shaped deposits have been determined. © 2015, Pleiades Publishing, Ltd.

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