# Optical properties and electrical transport in intercalated amorphous carbon

Kumari, Latha and Subramanyam, SV (2006) Optical properties and electrical transport in intercalated amorphous carbon. In: Materials Research Bulletin, 41 (11). pp. 2000-2006.

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## Abstract

Iodine and sulfur incorporated amorphous carbon (a-C) films are prepared by vapor phase pyrolysis of carbon rich organic precursor, maleic anhydride. Transmission electron microscopy (TEM) analysis depicts the intercalation induced local structural ordering and evolution of nano-graphitic phases in the sample. An X-ray photoelectron spectroscopy (XPS) study on these samples confirms the presence of intercalates. The study of optical properties of the samples by UV–vis absorption spectrometry accounts for a decrease in optical bandgap and Urbach energy with impurity incorporation and increase in pyrolysis temperature. This refers to induced structural ordering, decrease in disorder and increase in $sp^2$ or \pi -sites in the sample. Electrical conductivity measurement on a-C samples reveals increase in conductivity with pyrolysis temperature induced by iodine and sulfur incorporation.

Item Type: Journal Article Copyright of this article belongs to Elsevier. Amorphous materials;Vapor deposition;Electron microscopy; Optical properties;Electrical properties Division of Physical & Mathematical Sciences > Physics 29 May 2008 19 Sep 2010 04:45 http://eprints.iisc.ernet.in/id/eprint/14097