Prepared by
Citrate
and 
Citrate
Sulfate
Procedures
O. V. Dement’eva, A. V. Mal’kovskii, M. A. Filippenko, and V. M. Rudoy
Frumkin Institute of Physical Chemistry and Electrochemistry, Russian Academy of Sciences,
Leninskii pr. 31, Moscow, 119991 Russia
Received November 1, 2007
Abstract—Comparative study of the properties of silver hydrosols prepared with the use of two classical pro-
cedures (“citrate” and “citrate–sulfate”) is performed. The possibility of using these procedures for the synthe-
sis of stable monodisperse silver hydrosols with particle diameters of 20 nm and more is studied. The effect of
the main parameters of synthesis (the ratio of initial components, the rate of their mixing, etc) on the hydrosol
characteristics is investigated. It is revealed that, in the case of “citrate” synthesis, it is quite impossible to real-
ize conditions ensuring the reproducible preparation of colloidal solutions with particles having sufficiently uni-
form size and shape. The procedure for the one-stage preparation of “citrate–sulfate” hydrosol (without multi-
ple precipitation–redispersion of nanoparticles) is elaborated and it is shown that the thus prepared hydrosol is
greatly superior in both the optical characteristics and the morphological uniformity of particles to the citrate
sol. An increase in synthesis temperature to 100°C leads to a substantial enhancement of the stability of colloi-
dal solution. The possibility of using “citrate–sulfate” hydrosol for the design of two-dimensional ensembles of
silver nanoparticles on the quartz and silicon surfaces modified with poly(2-vinylpyridine) is demonstrated. It
is shown that such ensembles possess optical properties that allow to use them in designing “two-dimensional”
polymer–metal nanocomposites potentially suitable for using as active media in devices working on the prin-
ciple of surface plasmon resonance.
DOI: 10.1134/S1061933X08050050
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