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Disorder, Clustering, and Localization Effects in Amorphous Carbon

Carey, JD and Silva, S R (2004) Disorder, Clustering, and Localization Effects in Amorphous Carbon Physical Review B, 70 (23).


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The nanostructure of amorphous carbon thin films is described in terms of a disordered nanometer-sized conductive sp(2) phase embedded in an electrically insulating sp(3) matrix. It is shown that the degree of clustering and disorder within the sp(2) phase plays a determining role in the electronic properties of these films. Clustering of the sp(2) phase is shown to be important in explaining several experimental results including the reduction of the electron spin resonance linewidth with increasing spin density and the dispersion associated with the width of the Raman active G band. The influence of structural disorder, associated with sp(2) clusters of similar size, and topological disorder, due to undistorted clusters of different sizes, on both spin density and Raman measurements, is discussed. An extension of this description to intercluster interactions to explain some of the electrical transport and electron field emission behavior is also presented.

Item Type: Article
Divisions : Faculty of Engineering and Physical Sciences > Electronic Engineering > Advanced Technology Institute > Nano-Electronics Centre
Authors :
Silva, S
Date : 1 January 2004
DOI : 10.1103/PhysRevB.70.235417
Additional Information : Published in Physical Review B, Vol. 70, Iss. 23. Copyright 2004 American Physical Society.
Depositing User : Mr Adam Field
Date Deposited : 27 May 2010 14:07
Last Modified : 06 Jul 2019 05:06

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