Coronene Fusion by Heat Treatment: Road to Nanographenes
| Autor: | F Cataldo, Yury O. Tsybin, Andrzej Dzwilewski, Sultan Akhtar, Cheuk-Wai Tai, Alexandr V. Talyzin, Ellen Moons, Serhiy M. Luzan, J Fetzer, Klaus Leifer |
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| Rok vydání: | 2011 |
| Předmět: |
Annealing (metallurgy)
Infrared spectroscopy Photochemistry chemistry.chemical_compound symbols.namesake Pahs Carbon Materials Organic chemistry Dehydrogenation Physical and Theoretical Chemistry Dicoronylene Spectroscopy Edge State Infrared-Spectra Molecules Atmospheric temperature range Coronene Polycyclic Aromatic-Hydrocarbons Surfaces Coatings and Films Electronic Optical and Magnetic Materials General Energy chemistry symbols Graphite Sublimation (phase transition) Graphene Raman spectroscopy Raman-Spectrum |
| Zdroj: | The Journal of Physical Chemistry C. 115:13207-13214 |
| ISSN: | 1932-7455 1932-7447 |
| DOI: | 10.1021/jp2028627 |
| Popis: | The reactions of coronene dehydrogenation and fusion upon heat treatment in the temperature range of 500-700 degrees C were studied using XRD, TEM, Raman, IR, and NEXAFS spectroscopy. The formation of a coronene dimer (dicoronylene) was observed at temperatures 530-550 degrees C; dicoronylene can easily be separated using sublimation with a temperature gradient. An insoluble and not sublimable black precipitate was found to form at higher temperatures. Analysis of the data shows that dimerization of coronene is followed at 550-600 degrees C by oligomerization into larger molecules. Above 600 degrees C amorphization of the material and formation of graphitic nanoparticles was observed. Coronene fusion by annealing is proposed as a road to synthesis of larger polycyclic aromatic hydrocarbons and nanographenes. |
| Databáze: | OpenAIRE |
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