Talyzin, A. V.Luzan, S. M.Leifer, K.Akhtar, S.Fetzer, J.Cataldo, F.Tsybin, Y. O.Tai, C. W.Dzwilewski, A.Moons, E.2011-08-292011-08-292011-08-29201110.1021/jp2028627https://infoscience.epfl.ch/handle/20.500.14299/70353WOS:000292479700011The 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.Polycyclic Aromatic-HydrocarbonsInfrared-SpectraCarbon MaterialsRaman-SpectrumEdge StateGraphiteGrapheneMoleculesSpectroscopyPahstext::journal::journal article::research article