Russian Journal of Applied Chemistry, 2012, Vol. 85, No. 9, pp. 1307−1310.
Pleiades Publishing, Ltd., 2012.
Original Russian Text © E.A. Venediktov, E.P. Rozhkova, 2012, published in Zhurnal Prikladnoi Khimii, 2012, Vol. 85, No. 9, pp. 1388−1390.
AND INDUSTRIAL INORGANIC CHEMISTRY
Formation of Gold Nanoparticles in the System Constituted
by Chloroauric Acid and ED-20 Epoxy Oligomer
E. A. Venediktov
and E. P. Rozhkova
Krestov Institute of Solution Chemistry, Russian Academy of Sciences, Ivanovo, Russia
Ivanovo State University of Chemical Engineering, Ivanovo, Russia
Received March 14, 2012
Abstract—Possibility of obtaining gold nanoparticles in interaction of HAuCl
O with ED-20 epoxy oligo-
mer under heating was examined. Conditions for control over the size of Au nanoparticles in the course of their
formation are suggested.
Epoxy composites containing Au particles ﬁ nd use
in electrical engineering as electrically conducting glues
and solders . These composites are promising for
manufacture of new-generation displays  and may
be of interest for synthesis of epoxy metal-polymer
materials of new type . It is important to improve
the existing, and develop new effective and easily
implementable, methods for synthesis and dispersion of
metal particles in epoxy materials .
It has been shown previously that the ED-20 epoxy
oligomer ﬁ lled with Ag nanoparticles can be obtained
by reacting the oligomer with AgNO
[5, 6]. The main
goal of the present study is to demonstrate that a similar
approach can be used to ﬁ ll the epoxy resin with gold
nanoparticles. For this purpose, we studied how colloid
gold is formed when chloroauric acid (HAuCl
treated with ED-20.
We used ED-20 epoxy oligomer [GOST (State
Standard) 10587–84]. The compound HAuCl
was obtained by dissolution of chemically pure gold
(with the fraction of impurities not exceeding 10
in aqua regia . 1,4-Dioxane of analytically pure grade
was used without additional treatment.
We obtained the epoxy resin ﬁ lled with Au nanopar-
ticles by heating the ED-20– HAuCl
system. Because Au colloid particles have a character-
istic absorption spectrum [4, 8–14] determined by inter-
action of photons with surface conduction electrons, the
formation of metal particles was monitored by spectro-
photometry. The nanosize nature of metal particles was
substantiated by spectrophotometric data and conﬁ rmed
by measurements of their size distribution by the dy-
namic light-scattering method.
The absorption spectra were recorded on a Specord
M-40 double-beam spectrophotometer. Experiments on
dynamic light scattering were performed on a Zetasizer
Nano ZS installation (Malvern instruments, excitation
wavelength 633 nm, detection angle 173°).
The epoxy resin was heated in the presence of
O in a 1-cm-thick square glass cuvette.
Together with heating the resin, we measured its
absorption spectrum by using ED-20 at the same
temperature as reference. For this purpose, a weighed
portion (~5 mg) of preliminarily ground HAuCl
was placed in the cuvette. The cuvette with the weighed
portion was mounted in the thermostated holder of the
spectrophotometer, heated for 30 min at a prescribed
temperature, and gradually poured over without
agitation with 2 cm
of the epoxy oligomer heated to