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Self-assembly of dodecaphenyl POSS thin films

Handke, Bartosz ; Klita, Łukasz ; Niemiec, Wiktor

Surface science, 2017-12, Vol.666, p.70-75 [Periódico revisado por pares]

Amsterdam: Elsevier B.V

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  • Título:
    Self-assembly of dodecaphenyl POSS thin films
  • Autor: Handke, Bartosz ; Klita, Łukasz ; Niemiec, Wiktor
  • Assuntos: Atomic force microscopy ; Atomic structure ; Film growth ; Heat treatment ; High vacuum ; Microscopy ; Molecular structure ; Phase transitions ; Physical vapor deposition ; Polyhedral oligomeric silsesquioxane ; Self-assembly ; Silsesquioxane ; Sublimation ; Thermodynamic properties ; Thickness ; Thin films ; X-ray reflectivity ; X-rays
  • É parte de: Surface science, 2017-12, Vol.666, p.70-75
  • Descrição: •Dodecaphenyl POSS thin films deposited on Si surface by means of Physical Vapor Deposition formed layers accordingly to the Frank van der Merve model.•Thermal treatment of the thin films triggers self-organization process.•Direct proof of the lamellar structure formation provided by the x-ray reflectivity and reciprocal space mapping techniques.•The ordering mechanism relies on π stacking between phenyl rings of the molecules in the neighboring layers.•The film/substrate interface plays a key role in the self-assembly process. The self-assembly abilities of Dodecaphenyl Polyhedral Oligomeric Silsesquioxane thin films on Si(1 0 0) surfaces were studied. Due to their thermal properties – relatively low sublimation temperature and preservation of molecular structure – cage type silsesquioxanes are ideal material for the preparation of a thin films by Physical Vapor Deposition. The Ultra-High Vacuum environment and the deposition precision of the PVD method enable the study of early stages of thin film growth and its molecular organization. X-ray Reflectivity and Atomic Force Microscopy measurements allow to pursuit size-effects in the structure of thin films with thickness ranges from less than a single molecular layer up to several tens of layers. Thermal treatment of the thin films triggered phase change: from a poorly ordered polycrystalline film into a well-ordered multilayer structure. Self-assembly of the layers is the effect of the π−stacking of phenyl rings, which force molecules to arrange in a superlattice, forming stacks of alternating organic-inorganic layers. [Display omitted]
  • Editor: Amsterdam: Elsevier B.V
  • Idioma: Inglês
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  • Realização: ABCD-USP USP   Logos de Redes Sociais: Freepik

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