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Dielectric properties of sols of silver nanoparticles capped by alkyl carboxylate ligands

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Abstract

Sols of silver nanoparticles in toluene were studied by broadband dielectric spectroscopy (10−3–105 Hz). The frequency dependences of the specific alternating current (ac) conductivity and the complex electric modulus were used to estimate the temperature/frequency intervals of long- and short-range charge transfer occurs, respectively. A considerable increase (by more than 30 °C) in the Vogel temperature T 0 and the glass transition temperature T g in sols compared with the pure solvent was found. It can be hypothesized that these cooperative effects reflect the initial stage of the superlattice formation. Although the dielectric characteristics of sols are generally controlled by the conductivity relaxation, the dielectric response was observed in the high-frequency range (1–103 Hz) at low temperatures (from −50 to +10 °C). This response results from the presence of nanoparticles in solution. It is supposed that the relaxation is caused by the motion of ion impurities on the Ag nanoparticle surface within the carboxylate ligands shell. The dielectric properties of films strongly depend on both the characteristics of nanoparticles and the conditions of the film preparation. Like in sols, the direct current (dc) conductivity and the dielectric response of Ag nanoparticles in films are due to ion impurities.

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Authors and Affiliations

  1. Institute of Problems of Chemical Physics, Russian Academy of Sciences, 1 prosp. Akad. Semenova, 142432, Chernogolovka, Moscow Region, Russian Federation

    G. F. Novikov, M. V. Gapanovich, E. V. Rabenok, L. M. Bogdanova & L. I. Kuzub

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  1. G. F. Novikov
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  2. M. V. Gapanovich
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  3. E. V. Rabenok
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  4. L. M. Bogdanova
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  5. L. I. Kuzub
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Correspondence to G. F. Novikov.

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Published in Russian in Izvestiya Akademii Nauk. Seriya Khimicheskaya, No. 3, pp. 410–416, March, 2011.

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Novikov, G.F., Gapanovich, M.V., Rabenok, E.V. et al. Dielectric properties of sols of silver nanoparticles capped by alkyl carboxylate ligands. Russ Chem Bull 60, 419–425 (2011). https://doi.org/10.1007/s11172-011-0066-2

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  • DOI: https://doi.org/10.1007/s11172-011-0066-2

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