ISSN:
1089-7550
Source:
AIP Digital Archive
Topics:
Physics
Notes:
Structural properties of carbon films prepared by the pyrolysis of tetra chloro phthalic anhydride are investigated in an attempt to correlate it with the metal–insulator transition observed earlier as a function of deposition temperature, from electrical transport studies. Anomalous features are observed which evolve as the pyrolysis temperature is varied from 700 to 900 °C. This includes prepeaks in the x-ray diffraction pattern in the region less than 1 Å−1 providing evidence for medium range order, and a broad shoulder around 1200 cm−1 in the Raman spectra, which are seen in addition to the usually observed peaks in amorphous carbon films. A simple model is proposed according to which presence of "polymeric domains" containing chains of carbon atoms with single and double bond alternation (–C(Double Bond)C–), in a predominantly aromatic ring structure, could give rise to the anomalous features. © 2002 American Institute of Physics.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1063/1.1491021
