UV resistant poly(3,4-ethylenedioxythiophene) thin films: Layer-by-layer assembly with absorbing nanoparticles
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Layer-by-layer (LbL) assembly is used to create thin films by alternately exposing a substrate to positively- and negatively-charged molecules or particles in water. In recent years, LbL assemblies containing poly(3,4-ethylenedioxythiophene) (PEDOT) have been heavily studied, but little work has focused on improving the environmental stability of these thin films. Most intrinsically conductive polymers suffer from increasing resistance with exposure to ultraviolet light. Films made by alternately depositing poly(styrene sulfonate)-doped PEDOT and polyethylenimine (PEI) show an order of magnitude increase in sheet resistance after just 28 hours of exposure to 365 nm light, but this degradation is significantly diminished when TiO2nanoparticles are included in the PEI layers. © 2008 Materials Research Society.
author list (cited authors)
Dawidczyk, T., & Grunlan, J.