مشخصات پژوهش

Fuzzy nanofbers and single crystals developed using poly(3-hexylthiophene) (P3HT)-block-coily oligomers were compared. Based on grazing wide angle X-ray scattering and selected area electron difraction patterns, grown crystalline structures were mainly edge-on. P3HT fuzzy nanofbers and single crystals were covered by the dielectric coily blocks of polystyrene, poly(methyl methacrylate), and poly(ethylene glycol), leading to brush-like regions on surface of crystals in longitude of P3HT backbones. The atomic force microscopy demonstrated that the single crystals grown by self-seeding method were signifcantly longer (26–181 µm) and thicker (59 nm–1.4 µm) than the corresponding nanofbers (0.8–21 µm in length and 1.5–23 nm in thickness). P3HT backbones were also more intimately stacked in single crystals in both hexyl side chains and π–πstacking directions, particularly in toluene (13.42–14.63 and 3.30–3.47 Ǻ) than in nanofbers (15.03–16.17 and 3.51–3.67 Ǻ). End coily blocks resulted in slightly higher layer spacings in both nanofbers and single crystals. Shorter P3HT chains were laminated on each other in single crystals; however, they were mostly extended in the nanofbers. Poorer solvents, lower crystallization temperatures, and shorter P3HT chains increased the backbone lamination in single crystals.