具溫度感應性質之 PEDOT:PSS/PNIPAAm 透明導電薄膜合成及性質研究

Abstract

本研究的目的在於合成與製備具溫度感應性質之Poly(3,4-ethlyenedioxythiophene): Poly(styrenesulfonic acid) / Poly-NIPAAm (PEDOT:PSS/PNIPAAm) 透明導電薄膜並研究其不同配方對溫度感應性質與光電性質的影響。本研究分成兩個部份，第一部分使用氧化還原起始劑 (Redox initiator)，在室溫中將氮-異丙基丙烯醯胺（N-isopropylacrylamide, NIPAAm）單體聚合成聚（氮-異丙基丙烯醯胺）（Poly-NIPAAm, PNIPAAm），然後將其純化後溶於水中。另一方面使用聚乙烯苯磺酸（Poly(styrenesulfonic acid), PSS）作為高分子型分散劑，將3,4-乙烯基二氧噻吩（3,4-ethlyenedioxythiophene, EDOT） 氧化聚合為PEDOT:PSS 導電分散液。最後再將PNIPAAm混摻於PEDOT:PSS導電分散液中製備具有溫度感應性質PEDOT:PSS/PNIPAAm導電分散液。此導電薄膜除了具有導電功能外，同時也具有溫度感應性質。 第二部份使用自行合成之PNIPAAm與 PSS以不同比例混合作為高分子型分散劑PSS-PNIPAAm，在水相中將EDOT氧化聚合成PEDOT:PSS-PNIPAAm導電分散液，此導電薄膜同時具有導電功能與溫度感應性質。 在研究中，討論不同的製程方法與不同的PSS與NIPAAm混摻比例對PEDOT:PSS/NIPAAm與PEDOT:PSS-NIPAAm導電薄膜之透明度和導電度的影響，以及導電分散液和和導電薄膜之溫度感應性質，並以SEM與AFM觀察薄膜表面形態。

The purpose of this study was to synthesize Poly(3,4-ethlyenedioxythiophene): Poly(styrenesulfonic acid) / Poly-NIPAAm (PEDOT:PSS/PNIPAAm) transparent conductive film with thermal responsible property. In the first part, PEDOT:PSS/PNIPAAm conductive dispersion was carried out by directly mixing the PEDOT:PSS dispersion and PNIPAAm. Firstly, Poly(N-isopropylacrylamide) (PNIPAAm) was synthesized through radical polymerization via redox initiator, followed by purification and redissolution in the water for further application. Secondly, PEDOT:PSS conductive dispersion was carried out while PSS was served as a polymeric template. Finally, the obtained PEDOT:PSS solution was blended with PNIPAAm solution to fabricate PEDOT:PSS/PNIPAAm, which owned thermal responsible property and good optoelectronic property simultaneously. In the second part, the mixture of PNIPAAm and PSS was served as polymeric templates to oxidize EDOT and yield PEDOT:PSS-PNIPAAm conductive dispersion. This approach to introduce PNIPAAm was also feasible to exhibit the thermal responsible property for PEDOT:PSS-PNIPAAm conductive film. In this study, PEDOT:PSS/PNIPAAm and PEDOT:PSS-PNIPAAm conductive films prepared by two approach were employed. The optoelectronic properties such as conductivity and transparency of composite thin films with various PNIPAAm proportion were investigated. Meanwhile, the temperature responsible property of the conductive dispersions and composite thin films were also measured. Nevertheless, morphology of film surfaces was observed by SEM & AFM.