Study Of Microstructure Modification And Phase Transition Behavior Investigated By Rair Spectroscopy Of Poly(3-Hexylthiophene) Ultrathin Film

In this paper, the different microstructures and the phase transitions of the medium molecular weight regio-regular poly(3-hexylthiophene)(rr-P3HT) ultrathin film were investigated by RAIR, FTIR, and UV-vis at the same time it also uses WAXD andAFM.First it is found that using different solvent we can obtained two orientation structures.when using low boiling point solvent, face-on orientation structure forms. Then when using high boiling point solvent, edge-on orientation structure forms. During heating, face-on to edge-on orientation structure transition and Form Ⅰ-to-Form Ⅰ transition which forms from low boiling point solvent take place. In order to erase the effect of temperature on the structure, two thermal procedures have been used to investigate the annealing-induced structural change of P3HT thin film. It is found that thermal annealing can enhance the π-π interaction in P3HT crystal domain, whereas the improvement on the degree of crystallinity is not so obviously. Meanwhile, our results suggest that annealing-induced structural rearrangement on π-π stacking is irreversible, whereas the change on hexyl side chain packing is reversible.According to the P3HT excellent self-assembly in the solution, it can form nanowire in the solution. So we use ultrasonic oscillation to obtain prefect nanowire structure. In the experiment, When deal with30min by ultrasonic oscillation at0℃, P3HT can form thermal stable structure in the solution.It can be confirmed by UV-vis spectroscopy. Due to the excellent thermal stable in the room temperature, it can be widely applied in the real life.