Optical properties and electrical transport in intercalated amorphous carbon
| Autor: | Latha Kumari, S.V. Subramanyam |
|---|---|
| Rok vydání: | 2006 |
| Předmět: |
Materials science
Absorption spectroscopy Physics Mechanical Engineering Analytical chemistry chemistry.chemical_element Maleic anhydride Conductivity Condensed Matter Physics chemistry.chemical_compound chemistry X-ray photoelectron spectroscopy Amorphous carbon Mechanics of Materials Impurity General Materials Science Carbon Pyrolysis |
| Zdroj: | Materials Research Bulletin. 41:2000-2006 |
| ISSN: | 0025-5408 |
| DOI: | 10.1016/j.materresbull.2006.04.009 |
| Popis: | 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 π-sites in the sample. Electrical conductivity measurement on a-C samples reveals increase in conductivity with pyrolysis temperature induced by iodine and sulfur incorporation. |
| Databáze: | OpenAIRE |
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