General strategy for improving electrical conductivity and stretchability of PEDOT:PSS/ionic liquid composite thin films
발표자
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초록
내용
We investigate the effect of hydrogen bonding between the conductive polymer, poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS), and ionic liquids (ILs) on the improvement of electrical conductivity (σ) and stretchability of PEDOT:PSS/IL thin films. To this end, we prepared a series of protic- and aprotic-ILs (p-ILs and ap-ILs, respectively) with varying lengths of alkyl side chains in imidazolium (IM) cations. Although longer alkyl side chains in the IM cations led to decrease in σ and stretchability due to aggregation of PEDOT, the PEDOT:PSS/p-IL thin films showed largely improved σ (>2000 S/cm) and stretchability (>50%) compared to those of ap-IL counterparts. We attribute the improved σ and stretchability of the PEDOT:PSS/p-IL thin films to favorable ion exchange and strengthened molecular interactions between PEDOT:PSS and p-ILs. Our results provide a general design guideline for ILs for intrinsically stretchable and conductive PEDOT:PSS/IL thin films.