Presentation Information
[8a-PB2-8]Air-Water Interfacial Spreading of Hydrophobic Semiconducting Polymers Assisted by Amphiphilic Polymer Additives and Fabrication of Functional Ultrathin films
〇Aoi Matsumoto1,2, Hanyu Sun1,3, Shuta Fujioka1,3, Katsuhiko Ariga1,3, Yu Yamashita1,3 (1.NIMS, 2.Tokyo Univ of Science, 3.The Univ of Tokyo)
Keywords:
air-water interface,ultrathin film
In this study, we investigated a method to improve the spreading behavior of the semi-crystalline polymer semiconductor poly[2,5-bis(3-tetradecylthiophen-2-yl)thieno[3,2-b]thiophene] (PBTTT) at the air–water interface by adding an amphiphilic polymer, enabling the fabrication of uniform functional ultrathin films. While PBTTT alone tended to aggregate on the water surface, the addition of the amphiphilic polymer enabled uniform spreading and film formation. Furthermore, it was found that changing the substrate transfer direction led to a significant change in the water contact angle of the films. This suggests an interfacial molecular orientation in which hydrophilic moieties are directed toward the water side and hydrophobic moieties toward the gas phase. The resulting films exhibited a response as the active layer of an organic electrochemical transistor (OECT). These results demonstrate that improving spreadability through the addition of an amphiphilic polymer is effective for fabricating semiconducting polymer ultrathin films that exploit molecular rearrangement at the air–water interface, suggesting the potential to expand the applicability of interfacial processing.