科研之友
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摘要
Nanoimprinting has been widely explored not only to simply fabricate topographical nanostructures, but also to induce preferential molecule orientations of conjugated polymer films. We demonstrate here that poly(3-hexylthiophene) (P3HT) film with a nanograting topography can be fabricated very readily by a simple and cost-effective solvent-assisted room-temperature nanoimprinting lithography (SART-NIL) method. Grazing incidence wide angle X-ray diffraction (GIWAXD) is employed to determine the molecular orientation transition from edge-on to face-on alignment in the nanograting P3HT film. Furthermore, variation of the thermal annealing temperature from 23 degrees C to 150 degrees C verifies that the highly ordered nanostructure morphology of the nanograting film nearly vanishes at elevated annealing temperatures; however, the nanoimprint-induced face-on molecule orientation is remarkably well retained within the distorted nanograting film. Surprisingly, the crystallization degree of the face-on alignment increases steadily and independently after thermal annealing.
