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


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Article Info

DATE

2012-07

AUTHORS

A. A. Timofeev, M. I. Alymov, A. G. Gnedovets

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. More... »

PAGES

401-408

Identifiers

URI

http://scigraph.springernature.com/pub.10.1134/s1995078012040131

DOI

http://dx.doi.org/10.1134/s1995078012040131

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1001193076


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