ISSN 1070-4272, Russian Journal of Applied Chemistry, 2006, Vol. 79, No. 4, pp. 674!676. + Pleiades Publishing, Inc., 2006.
Original Russian Text + E. I. Isaeva, T. B. Boitsova, V. V. Gorbunova, 2006, published in Zhurnal Prikladnoi Khimii, 2006, Vol. 79, No. 4,
Photochemical Synthesis of Gold Nanoparticles in Latexes
E. I. Isaeva, T. B. Boitsova, and V. V. Gorbunova
Herzen Russian State Pedagogic University, St. Petersburg, Russia
Received July 5, 2005; in final form, December 2005
Abstract-Gold nanoparticles in aqueous dispersions of 100-nm polystyrene microspheres were prepared
by photochemical synthesis under exposure to monochromatic light with an excitation wavelength of 254 nm.
The kinetic relationships in formation of gold nanoparticles were examined in relation to the H[AuCl
polymer concentration in the photolyte.
Nanoparticles of transition metals, especially gold,
show much promise for the development of functional
nanophase materials for medical, biochemical, and
cytometric applications [1, 2]. Microspheres of poly-
mers with grafted functional groups can be considered
as model systems for deposition of metal nanparticles
and development of specific labels in diagnostics of
genetic and pathogenic diseases.
In this study we carried out photochemical syn-
thesis of gold nanoparticles in aqueous polystyrene
Gold nanoparticles were prepared from solutions
of analytically pure grade H[AuCl
]. All solutions
were prepared in double-distilled water. We used
polystyrene carboxylated with 4,4`-azobis(4-cyano-
isovaleric acid) in the form of a latex consisting of
100-nm microspheres, stabilized with sodium dodecyl
A preliminary study of the aggregation stability
of the latex dispersions showed that introduction of
] in concentrations above 0.1 mM leads to
destabilization of the systems, manifested in coagula-
tion and precipitation of the latex particles. The gold
nanoparticles were synthesized in the presence of the
latex in H[AuCl
] solutions with concentrations from
2 0 10
to 2 0 10
M, which were mixed with latex-
es containing 5 0 10
and 5 0 10
wt % polystyrene.
The resulting compositions were irradiated for 4 h
with a monochromatic light at the excitation wave-
= 254 nm and the light flux intensity of
4.8 0 10
. Irradiation was carried out
in quartz cells with the optical path length of 1 cm.
Formation of nanostructures was monitored spectro-
photometrically (an SF-2000 spectrophotometer) from
the appearance of absorption within 2003700 nm.
Figure 1 presents the absorption spectra of aqueous
dispersions of 100-nm polystyrene microspheres, con-
taining 2 0 10
]. After 60-min UV ir-
Fig. 1. Absorption spectra of an aqueous dispersion of
100-nm polystyrene microspheres, containing 2 010
], recorded during photolysis with monochromatic
= 254 nm). (D) Optical density and (l) wave-
length. Time, min: (1)0,(2) 30, (3) 60, (4) 90, (5) 120,
(6) 150, and (7) 180.