Logarithmic temperature dependence of conductivity in a random quasi-two dimensional assembly of gold nanoclusters

Electrical conductivity measurements on a two-dimensional random assembly of Au nanoclusters of an average size 5 nm and an average inter-cluster separation of 12 nm show logarithmic temperature dependence of conductivity in the temperature range 205-229 K followed by an activated nearest neighbour...

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Bibliographic Details
Published in:Journal of physics communications 2017-08, Vol.1 (1), p.15008
Main Authors: Abraham, Thejal, Bansal, Chandrahas
Format: Article
Language:English
Subjects:
Coulomb blockade
logarithmic temperature dependence
nanocluster film
Temperature
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Summary:Electrical conductivity measurements on a two-dimensional random assembly of Au nanoclusters of an average size 5 nm and an average inter-cluster separation of 12 nm show logarithmic temperature dependence of conductivity in the temperature range 205-229 K followed by an activated nearest neighbour hopping conduction in the temperature range 230-340 K. The activation energy for hopping was found to be approximately equal to the Coulomb charging energy of a cluster. The charge transport between clusters in the logarithmic regime is shown to take place by a random walk of step size equal to the average inter-cluster separation.
ISSN:2399-6528
2399-6528
DOI:10.1088/2399-6528/aa81b6