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Carbon nitride thin films were deposited using an ArF excimer laser to ablate a target of 3,5 diamino 1,2,4 triazole (guanazole) in a reactive atmosphere of ammonia. Films were obtained at room temperature onto crystalline silicon and aluminium substrates. The dependence of the film properties on the ammonia pressure is reported. Films were characterized systematically by profilometry, Fourier Transform...
Here we present a new approach towards extremely large polycyclic aromatic hydrocarbons (PAHs), which uses smooth ambient-temperature cyclodehydrogenation conditions of oligophenylenes in contrast to conventional pyrolytic fusion methods. Vapor-deposition of these structurally well-defined, large arenes leads to supramolecular, space filling arrangements as revealed by scanning tunneling microscopy...
CO 2 laser induced decomposition of 3-butyn-2-one in the gas phase results in the deposition of carbonaceous films composed of a graphitic and monohydrogenated carbon, in which H is dominantly bonded to sp3 sites. The films incorporate oxygen in superficial layers. The technique is suitable for preparation of thin C-based films at low substrate temperatures.
Here we present a new approach to extremely large polycyclic aromatic hydrocarbons (PAHS) based on a cyclodehydrogenation method for polyphenylene dendrimers. These polyphenylene dendrimers are synthesized by repeated Diels-Alder reactions of ethynyl-substituted tetraphenylcyclopentadienones (1b) to the tetraethynylbiphenyl (2) core. Molecular mechanics and molecular dynamics calculations revealed...
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