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Formation of an ensemble of gold clusters in a thin amorphous carbon film by electron beam

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Abstract

The origination and evolution processes of gold clusters in a three-layer carbon-(gold + carbon)-carbon system have been observed in situ in the column of a transmission electron microscope. It has been shown that the sizes of the gold nanoclusters depend on the duration of the impact of a fast electron beam. Under long-term exposure (about 2 h) with an electric current density of 1.2 A/cm2, nanocrystallites with a maximum size reaching 4.5 nm are formed in the central region of the film. It is found that the average size of nanoclusters decreases with an increase in the distance from the center of the heat source; nanoclusters are not formed outside the impact area of the electron beam. The change in the nanocrystal sizes in this region correlates with the intensity profile of the electron beam. It is established that the coarsening of nanoclusters is achieved both through the mechanism of coalescence and the mechanism of coagulation.

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Authors and Affiliations

  1. Moscow Engineering Physics Institute (National Nuclear Research University), Kashirskoe sh. 31, Moscow, 115409, Russia

    A. A. Timofeev

  2. Baikov Institute of Metallurgy and Materials Science, Russian Academy of Sciences, Leninskii pr. 49, Moscow, 119991, Russia

    M. I. Alymov & A. G. Gnedovets

Authors
  1. A. A. Timofeev
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  2. M. I. Alymov
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  3. A. G. Gnedovets
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Correspondence to M. I. Alymov.

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Original Russian Text © A.A. Timofeev, M.I. Alymov, A.G. Gnedovets, 2012, published in Rossiiskie Nanotekhnologii, 2012, Vol. 7, Nos. 7–8.

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Timofeev, A.A., Alymov, M.I. & Gnedovets, A.G. Formation of an ensemble of gold clusters in a thin amorphous carbon film by electron beam. Nanotechnol Russia 7, 401–408 (2012). https://doi.org/10.1134/S1995078012040131

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  • DOI: https://doi.org/10.1134/S1995078012040131

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