Abstract
A cyno-substituted thiophene/phenylene co-oligomer (TPCO), 5,5′-bis(4′-cyanobiphenyl-4-yl)−2,2′-bithiophene (BP2T-CN), is vapor-deposited on KCl (001) surface kept at 220°C by the mask-shadowing method. Transmission electron microscopy and fluorescence microscopy reveal that the deposited BP2T-CN crystallizes in two types of morphologies: microneedles and thin film crystallites. In particular, the predominant microneedles epitaxially grow in four directions in the manner that the BP2T-CN molecules align along the [110]KCl or [−110]KCl. X-ray diffraction patterns indicate that the BP2T-CN molecules in the microneedle lie parallel while those in the thin film crystallite obliquely stand on the KCl surface.
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