New supramolecular structures based on silver nanoparticles and micelle-like aggregates of cetyltrimethylammonium bromide

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Abstract

A method for synthesizing new supramolecular structures consisting of silver nanoparticles (NPs) whose surfaces are covered with spontaneously formed ordered micelle-like aggregates of cetyltrimethylammonium bromide (CTAB) molecules is proposed. The study of the self-assembly processes of CTAB molecules on the surface of silver nanoparticles and the structure of the resulting associates was carried out using the fluorescence probe method (molecular probe – pyrene). Optimal conditions for obtaining new supramolecular structures were determined. The proposed supramolecular structures can be used for the luminescent determination of various chemical compounds. The formation of the analytical signal in this case will be determined by the interaction of the analyte with micelle-like aggregates located near the silver nanoparticles and will depend on both the structure of the aggregate and the polarity of the analyte.

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G. I. Romanovskaya

Vernadsky Institute of Geochemistry and Analytical Chemistry, Russian Academy of Sciences

Author for correspondence.
Email: Gromanovskaya@yandex.ru
Russian Federation, 119991 Russia

M. V. Koroleva

Vernadsky Institute of Geochemistry and Analytical Chemistry, Russian Academy of Sciences

Email: Gromanovskaya@yandex.ru
Russian Federation, 119991 Russia

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2. Fig. 1. Fluorescence spectra of systems containing pyrene molecules (5.0×10–8 M) in the presence of cetyltrimethylammonium bromide (CTMA) and silver aquasol solutions of different concentrations, obtained at λexc = 350 nm. 1 − CTMA concentration 0.5 mM, silver aquasol concentration 1.0 × 10–6 M; 2 − CTMA concentration 1.5 mM, silver aquasol concentration 1.0×10–7 M; 3 − CTMA concentration 1.5 mM, silver aquasol concentration 5.0×10–7 M.

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3. Fig. 2. Fluorescence excitation spectra of systems containing pyrene molecules (5.0×10–8 M) in the presence of aqueous solutions of cetyltrimethylammonium bromide (CTMA) and silver aquasol of different concentrations, obtained at different wavelengths of fluorescence observation. 1 − CTMA concentration 1.5 mM, silver aquasol concentration 1.0 ×10–6 M at λfl = 425 nm; 2 − CTMA concentration 0.5 mM, silver aquasol concentration 1.0×10–6 M at λfl = 470 nm; 3 − CTMA concentration 1.5 mM, in the absence of silver aquasol at λfl = 425 nm.

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