TY - JOUR
T1 - Unraveling the Humidity Influence on the Electrical Properties of Ionic Liquid Posttreated Poly(3,4-ethylene dioxythiophene):Poly(styrenesulfonate) Films
AU - Oechsle, Anna Lena
AU - Schöner, Tobias
AU - Geiger, Christina
AU - Tu, Suo
AU - Wang, Peixi
AU - Cubitt, Robert
AU - Müller-Buschbaum, Peter
N1 - Publisher Copyright:
© 2023 American Chemical Society.
PY - 2023/11/28
Y1 - 2023/11/28
N2 - The conductive polymer blend poly(3,4-ethylene dioxythiophene):poly(styrenesulfonate) (PEDOT:PSS), popular for numerous organic applications, is investigated in terms of the influences that ionic liquid (IL) treatment and ambient humidity have on its conductivity properties. PEDOT:PSS thin films posttreated with different concentrations of the IL 1-ethyl-3-methylimidazolium dicyanamide (EMIM DCA) are exposed to different relative humidity (RH) steps from 0% RH up to 90% RH. Simultaneously, the film swelling and increase in the scattering length density (SLD), indicating a water uptake of the films, are monitored in situ with spectral reflectance (SR) and time-of-flight neutron reflectometry (ToF-NR). Additional in situ electrochemical impedance spectroscopy (EIS) shows that the pristine PEDOT:PSS has only an electronic conductivity, while for the IL-treated samples, an additional ionic conductivity contribution is observed. Upon humidity increase, the electronic conductivity of all PEDOT:PSS thin films decreases, while the ionic conductivity for IL posttreated thin films is enhanced by the intake of water molecules.
AB - The conductive polymer blend poly(3,4-ethylene dioxythiophene):poly(styrenesulfonate) (PEDOT:PSS), popular for numerous organic applications, is investigated in terms of the influences that ionic liquid (IL) treatment and ambient humidity have on its conductivity properties. PEDOT:PSS thin films posttreated with different concentrations of the IL 1-ethyl-3-methylimidazolium dicyanamide (EMIM DCA) are exposed to different relative humidity (RH) steps from 0% RH up to 90% RH. Simultaneously, the film swelling and increase in the scattering length density (SLD), indicating a water uptake of the films, are monitored in situ with spectral reflectance (SR) and time-of-flight neutron reflectometry (ToF-NR). Additional in situ electrochemical impedance spectroscopy (EIS) shows that the pristine PEDOT:PSS has only an electronic conductivity, while for the IL-treated samples, an additional ionic conductivity contribution is observed. Upon humidity increase, the electronic conductivity of all PEDOT:PSS thin films decreases, while the ionic conductivity for IL posttreated thin films is enhanced by the intake of water molecules.
UR - http://www.scopus.com/inward/record.url?scp=85178638034&partnerID=8YFLogxK
U2 - 10.1021/acs.macromol.3c01842
DO - 10.1021/acs.macromol.3c01842
M3 - Article
AN - SCOPUS:85178638034
SN - 0024-9297
VL - 56
SP - 9117
EP - 9126
JO - Macromolecules
JF - Macromolecules
IS - 22
ER -