Preparation and characterization of water soluble and conducting poly(sodium 4-styrenesulfonate) doped poly(3,4- ethylenedioxythiophene)/multi-walled carbon nanotubes core-shell nanocomposites by in situ polymerization

摘要

Water soluble and conducting poly(sodium 4-styrenesulfonate) (PSSNa) doped poly(3,4-ethylenedi-oxythiophene) (PEDOT)/multi-walled carbon nanotubes (MWNTs) nanocomposites were synthesized by PSSNa functionalized MWNTs and 3,4-ethylenedioxythiophene (EDOT) in situ oxidation polymerization. In the process, MWNTs were functionalized by PSSNa via physicochem-ical interaction, PSS groups on the surface of MWNTs absorbed EDOT monomers and acted as counter ions during in situ polymerization, macromolecules of PEDOT growth on the surface of MWNTs formed a homogeneous core (MWNTs)-shell (PEDOT) nanostructure. Owing to water soluble PEDOT-PSSNa coating on the surface of MWNTs and the association of PSSNa acting as inter-linking between PEDOT and MWNTs, the core-shell nanostruc-tures were dissolved in water forming stable aqueous solution with good transparence. The composite was more stable in the temperature range up to 300 ℃ and exhibited improved thermal stability at the range of 300-500 ℃ compared with PEDOT-PSSNa. Because of π-π interactions between MWNTs and PEDOT coatings as well as homogenously dispersion of MWNTs in PEDOT, conductivity of the composites at room temperature was increased by two orders of magnitude over PEDOT-PSSNa.