Disorder, clustering, and localization effects in amorphous carbon
Carey, JD and Silva, S. R. P. (2004) Disorder, clustering, and localization effects in amorphous carbon Physical Review B, 70 (235417).
The nanostructure of amorphous carbon thin films is described in terms of a disordered nanometer-sized conductive sp2 phase embedded in an electrically insulating sp3 matrix. It is shown that the degree of clustering and disorder within the sp2 phase plays a determining role in the electronic properties of these films. Clustering of the sp2 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 sp2 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.
|Divisions :||Faculty of Engineering and Physical Sciences > Electronic Engineering > Advanced Technology Institute > Nano-Electronics Centre|
|Date :||16 December 2004|
|Identification Number :||10.1103/PhysRevB.70.235417|
|Additional Information :||Published in Physical Review B, 70, 235417. © 2004 The American Physical Society.|
|Depositing User :||Mr Adam Field|
|Date Deposited :||27 May 2010 14:38|
|Last Modified :||23 Sep 2013 18:31|
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