期刊
ACS APPLIED MATERIALS & INTERFACES
卷 10, 期 11, 页码 9865-9872出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.8b00446
关键词
polymer electrode; PEDOT:PSS; humidity; neutron reflectivity; in situ study
资金
- International Research Training Group 2022 Alberta/Technical University of Munich International Graduate School for Environmentally Responsible Functional Hybrid Materials (ATUMS)
- TUM.solar in the context of the Bavarian Collaborative Research Project Solar Technologies Go Hybrid (SolTech)
- Excellence Cluster Nanosystems Initiative Munich (NIM)
- Center for NanoScience (CeNS)
- BMBF [05K16WOA]
Polymer electrodes made of poly(3,4-ethylenedioxythiophene):polystyrene sulfonate (PEDOT:PSS) are used in many applications but are also sensitive to humidity. We study humidity-induced changes of PEDOT:PSS electrodes as monitored with in situ time-of-flight neutron reflectivity (TOF-NR) measurements under high humidity conditions. The influence of the solvent additive Zonyl and a post-treatment of PEDOT:PSS films with ethylene glycol (EG) serving as electrodes are analyzed with respect to the swelling ratio and water uptake. Depending on the applied PEDOT:PSS treatment, PEDOT and PSS enrichment layers are dearly identified with TOF-NR at the substrate polymer and polymer air interface, respectively. The additive Zonyl reduces the water uptake and limits film swelling. EG post-treatment further increases hydrophobicity and thereby water incorporation into the PEDOT:PSS film is strongly suppressed. The characteristic time constants and effective interaction parameters extracted from the kinetic NR data show that additive and post-treatment reduce the sensitivity of the PEDOT:PSS electrodes to humidity.
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