Growth Mechanism of Strain-Dependent Morphological Change in PEDOT:PSS Films
- Growth Mechanism of Strain-Dependent Morphological Change in PEDOT:PSS Films
- 최인석; Yoo-Yong Lee; Gwang Mook Choi; Seung-Min Lim; Ju-Young Cho; KiTae Nam; Young-Chang Joo
- Issue Date
- Scientific Reports
- VOL 6, NO 25332-9
- Understanding the mechanism of the strain-dependent conductivity change in polymers in stretched conditions is important. We observed a strain-induced growth of the conductive regions of PEDOT:PSS films, induced by a coalescence of conductive PEDOT-rich cores. This growth due to coalescence leads to a gradual decrease in the electrical resistivity up to 95%, independent of the thickness of the PEDOT: PSS films. The primary mechanism for the evolution of the PEDOT-rich cores proceeds by the cores growing larger as they consuming relatively smaller cores. This process is caused by a strain-induced local rearrangement of PEDOT segments in the vicinity of PSS shells around the cores and also changes the chemical environment in PEDOT, induced by the electron-withdrawing effects around the PEDOT chains. The strain-induced growth mechanism is beneficial to understanding the phenomenon of polymeric chain rearrangement in mechanical deformation and to modulating the electrical conductivity for practical applications.
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