Effect of molecular weight distribution of PSSA on electrical conductivity of PEDOT:PSS

Jooyoung Kim, Chanil Park, Soeun Im, Hongjoo Lee, Jung Hyun Kim

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Poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) is the most successful conductive polymer. In this study, we investigated the electrical properties of PEDOT:PSS prepared using poly(styrenesulfonic acid) (PSSA) having different molecular weight distributions. Herein PSSA with different molecular weight distributions were successfully polymerized by free radical polymerization and atom-transfer radical polymerization (ATRP). Polydispersity index values of PSSA obtained by the free radical process and ATRP process were 2.3-2.8 and 1.2-1.6 respectively. The electrical conductivity of PEDOT:PSS was enhanced from 376 S cm −1 (prepared using free radical PSSA) to 422 S cm −1 (prepared using ATRP PSSA) when PSSA of Mn 35 000 g mol −1 PSSA was used and was enhanced from 234 S cm −1 (prepared using free radical PSSA) to 325 S cm −1 (prepared using ATRP PSSA) when PSSA of Mn 55 000 g mol −1 was used, by a factor of 15-30%. The greater the regularity of PSSA, the greater the packing density of PEDOT:PSS and consequently, charge carrier density. The improvement of packing density of PEDOT:PSS was confirmed by improvement in crystallinity of PEDOT:PSS by X-ray diffraction (XRD) analysis.

Original languageEnglish
Pages (from-to)4028-4034
Number of pages7
JournalRSC Advances
Issue number7
Publication statusPublished - 2019 Jan 1


All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Chemical Engineering(all)

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