Abstract
Directional epitaxial crystallization is used to prepare highly oriented films of poly(9,9‘-di-n-octyl-2,7-fluorene) (PFO). This orientation method implies the use of a crystallizable aromatic solvent (1,3,5-trichlorobenzene) playing successively the role of the solvent for PFO for T > 63 °C and the role of an orienting substrate below this temperature. Extended areas of the oriented PFO can be formed on a given substrate after simple evaporation of the crystallized solvent under vacuum. The effect of annealing on the thin film structure and morphology was followed by transmission electron microscopy (TEM) in bright field and dark field modes and atomic force microscopy. Upon annealing, oriented crystalline PFO lamellae and axialites are formed by coalescence of smaller nanocrystalline domains. As shown by electron diffraction, a single-crystal-like structure is formed after a short annealing of the as-oriented films at 210 °C and slow cooling (0.5 °C/min) to room temperature. The films consist of oriente...
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