Premium
Investigation of the doping efficiency of poly(styrene sulfonic acid) in poly(3,4‐ethylenedioxythiophene)/poly(styrene sulfonic acid) dispersions by capillary electrophoresis
Author(s) -
Diah Anang W. M.,
Quirino Joselito P.,
Belcher Warwick,
Holdsworth Clovia I.
Publication year - 2014
Publication title -
electrophoresis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.666
H-Index - 158
eISSN - 1522-2683
pISSN - 0173-0835
DOI - 10.1002/elps.201400056
Subject(s) - pedot:pss , conductivity , materials science , sulfonic acid , styrene , doping , polymer chemistry , chemical engineering , conductive polymer , polymer , analytical chemistry (journal) , chemistry , organic chemistry , optoelectronics , copolymer , composite material , engineering
CE can efficiently separate poly(3,4‐ethylenedioxythiophene)/poly(styrene sulfonic acid) ( PEDOT / PSS ) complexes and free PSS in dispersions and can be used to estimate the degree of PSS doping. We investigated the doping efficiency of PSS on PEDOT in dispersions using CE and its effect on the conductivity of the resulting PEDOT / PSS films. Results of this study indicate that dispersions containing 1:2.5–3 EDOT : PSS feed ratio (by weight) exhibiting 72–73% PSS doping generate highly processable and highly conductive films. Conductivity can be optimized by limiting the time of reaction to 12 h. At this point of the reaction, the PEDOT / PSS segments, appearing as broad band in the electropherogram, could still exist in an extended coil conformation favoring charge transport resulting in high conductivity. Above a threshold PEDOT length formed at reaction times longer than 12 h, the PEDOT / PSS complex, appearing as spikes in the electropherogram, most likely have undergone a conformational change to coiled core‐shell structure restricting charge transport resulting in low conductivity. The optimal conductivity (5.2 S/cm) of films from dispersions synthesized for 12 h is significantly higher than those from its commercial equivalent C levios P and other reported values obtained under similar conditions without the addition of codopants.