Interface induced crystal structures of dioctyl-terthiophene thin films

Langmuir : the ACS Journal of Surfaces and Colloids
Oliver WerzerMichele Sferrazza

Abstract

Temperature dependent structural and morphological investigations on semiconducting dioctyl-terthiophene (DOTT) thin films prepared on silica surfaces reveals the coexistence of surface induce order and distinct crystalline/liquid crystalline bulk polymorphs. X-ray diffraction and scanning force microscopy measurements indicate that at room temperature two polymorphs are present: the surface induced phase grows directly on the silica interface and the bulk phase on top. At elevated temperatures the long-range order gradually decreases, and the crystal G (340 K), smectic F (348 K), and smectic C (360 K) phases are observed. Indexation of diffraction peaks reveals that an up-right standing conformation of DOTT molecules is present within all phases. A temperature stable interfacial layer close to the silica-DOTT interface acts as template for the formation of the different phases. Rapid cooling of the DOTT sample from the smectic C phase to room temperature results in freezing into a metastable crystalline state with an intermediated unit cell between the room temperature crystalline phase and the smectic C phase. The understanding of such interfacial induced phases in thin semiconducting liquid crystal films allows tuning of cry...Continue Reading

References

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Apr 21, 2005·Journal of Synchrotron Radiation·Detlef M SmilgiesOleg Konovalov
Aug 23, 2006·Langmuir : the ACS Journal of Surfaces and Colloids·Vinciane De CupereYves Henri Geerts
Apr 15, 2011·Advanced Materials·Hiroaki Iino, Jun-ichi Hanna

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Citations

Nov 2, 2014·Physical Chemistry Chemical Physics : PCCP·M SparenbergS Kowarik
Dec 17, 2011·Advanced Materials·Gabin GbabodeYves H Geerts
Jul 22, 2014·Chemistry : a European Journal·Magalí LingenfelderDavid B Amabilino
Nov 23, 2016·Journal of Physics. Condensed Matter : an Institute of Physics Journal·Stefan Kowarik
Jan 15, 2014·Molecular Pharmaceutics·Oliver WerzerEva Roblegg
Jun 27, 2014·The Journal of Physical Chemistry. C, Nanomaterials and Interfaces·Heike M A EhmannOliver Werzer
Aug 16, 2014·Crystal Growth & Design·Heike M A Ehmann, Oliver Werzer

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