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Synergetic Effect of Perfluorooctanoic Acid on the Preparation of Poly(3,4‐ethylenedioxythiophene): Lignosulfonate Aqueous Dispersions with High Film Conductivity
Author(s) -
Li Yuda,
Lou Hongming,
Wang Feng,
Pang Yuxia,
Qiu Xueqing
Publication year - 2019
Publication title -
chemistryselect
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.437
H-Index - 34
ISSN - 2365-6549
DOI - 10.1002/slct.201902856
Subject(s) - dopant , pedot:pss , poly(3,4 ethylenedioxythiophene) , materials science , conductivity , chemical engineering , aqueous solution , polymerization , polymer , doping , nanotechnology , chemistry , organic chemistry , composite material , optoelectronics , engineering
Developing poly(3,4‐ethylenedioxythiophene) (PEDOT) conducting polymers (CPs) aqueous dispersions with high film conductivity is an attractive task in scientific and industrial communities. Herein, we proposed to apply small molecular perfluorooctanoic acid (PFA) as assistant dopant to cooperate with major polymeric dopant of lignosulfonate (LGS) to prepare PEDOT aqueous dispersions together. Through optimizing the usage amount of PFA, a high film conductivity of 0.1255 S⋅cm −1 was obtained. In contrast, the film conductivity of the CP prepared without PFA was only 0.0228 S⋅cm −1 . By lucubrating the structure of CPs, we found that PFA is capable of promoting the polymerization, doping and aggregation of PEDOT in the preparation process of PEDOT:LGS CP and the conductivity enhancement can be attributed to the enhancement of molecular weight, doping degree and aggregation of PEDOT. Moreover, the other physical‐chemical properties of PEDOT:LGS CPs including transmittance, work function and waterproofness were not obviously affected by PFA. This facile strategy based on physical mixing of small molecular and polymeric dopants may opens up a new window for the preparation of high performance CPs aqueous dispersions.