| 초록 |
A highly π-conjugated nanofibrillar network of poly(3-hexylthiophene)(P3HT) embedded in polydimethylsiloxane(PDMS) elastomer films was facilely developed via blending of an ultrasound-assisted dilute P3HT solution with a PDMS precursor followed by spin-casting and curing. In contrast, simple blending without any ultrasonication against the dilute P3HT solution yielded large agglomerates in films owing to a great difference in solubility parameter (δ) values (P3HT = 9.5, PDMS = 7.3 cal1/2cm−3/2). In the ultrasound-assisted 0.1 vol% P3HT solutions, the π-conjugated polymer could develop crystalline nanofibrils surrounded by nonpolar hexyl side chains with the same δ value as that of PDMS, yielding homogeneously dispersed 10 wt% loaded P3HT/PDMS blend films. Spun-cast P3HT/PDMS blend films could yield high electrical properties in field-effect transistor, including mobilities of up to 0.045 cm2/Vs, as well as excellent environmental stability owing to the outer PDMS layer. |
