Synthesis of new thiophene-based π-conjugated polymers for investigation of molecular alignment on the surface of platinum plate

The synthesis of new thiopene-based π-conjugated polymers was examined for the investigation of molecular alignment on the surface of platinum plates. The morphology of π-conjugated polymer is cast or spin-coated films is considered to be an important factor to decide the performance of several electronic devices. It has been demonstrated that some of the π-conjugated polymers with alkyl side chains have a strong tendency to assume an ordered structure in cast films on various substrates with the alkyl side chains oriented toward the surface of the substrate. The x-ray diffraction (XRD) patterns of the cast films on a Pt plate clearly exhibit disappearance of the d2 and d3 peaks which is taken as the indication of molecular alignment of the polymers. The results show that the stacking of the thiopene-based polymers and their alignment on the substrate are correlated with the UV-vis peak shift between the solution and film.