Effect of protic ionic liquids on electrical conductivity and elasticity of PEDOT:PSS-based stretchable and transparent electrodes
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초록
내용
We investigate the effect of hydrogen bonding in ionic liquids (ILs) on the electrical conductivity and elasticity of poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS)/IL thin films. By comparing the electrical conductivity (σ) and elasticity of the PEDOT:PSS thin films processed with a series of protic ILs (p-ILs) and aprotic ILs (ap-ILs) based on the imidazolium cations with varying lengths of alkyl side chains, we demonstrate that the p-ILs can decrease the binding distance among ion pairs via strong hydrogen bonds, thereby leading to densely packed nanofibrils and associated enhancement of σ and elasticity compared with those of ap-ILs. As a result, the PEDOT:PSS/p-ILs thin films show enhanced σ approaching 2,500 S cm−1 and elasticity with increased crack onset strain value exceeding 50%. Our results provide insight into how ILs confer elasticity to PEDOT:PSS and will facilitate the design of ILs for high-performance stretchable and transparent electrodes.