Emulsion Synthesis and Characterization of Conducting Core-Shell Latex Nanoparticles
Date Issued
2006
Date
2006
Author(s)
Chi, Hung-Yu
DOI
zh-TW
Abstract
Poly(3,4-ethylenedioxythiophene) : polystyrene sulfonic acid (PEDOT:PSS) is a widely used conductive aqueous latex dispersion synthesized by using emulsion polymerization. In order to further enhance its conductivity we propose to replace the nonconductive PSS with conductive poly[2-(3thienyl)-ethoxy-4-butylsulfonate] (SPT) as the surfactant for the PEDOT emulsion polymerization. The effect of the molecular weight and the amount of SPT in PEDOT:SPT on the electrical property, thermal property, crystal structure and the morphology of the core-shell latex are thoroughly studied using the four-point probe measurement, XPS, TGA, XRD and TEM.
Smaller and spherical core-shell PEDOT:SPT nanoparticles with diameter <100nm can be synthesized with increasing amount of SPT added during the emulsion polymerization. TGA measurement shows that the thermal degradation temperature of latex increases considerably with increasing amount of SPT which indicates an increase in the molecular weight of PEDOT synthesized. XPS and FTIR measurements show an increased level of doping on PEDOT with increasing amount of SPT. The substantial increase in the conductivity of PEDOT:SPT film is attributed mainly to the combined effect of higher molecular weight and the doping level of PEDOT synthesized. Lower molecular weight SPT is shown to synthesize higher molecular weight PEDOT of which a higher conductivity is measured.
Subjects
乳化聚合
聚(3,4-二氧乙基噻
吩)(PEDOT)
側鏈磺酸化之聚噻
吩(SPT)
界面活性劑
導電度
emulsion polymerization
PEDOT
SPT
surfactant
high conductivity
water-soluble polymer
Type
thesis
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