Synthesis And Characterization Of Conducting Nanocomposites

In recent years, conducting polymer nanostructure has been attracted more attentions due to their excellent optic, electric and gas sensitivity performances. Poly(ethylenedioxythiophene) is one of the most important inherently conductive polymer materials. The high environment stability of both its doped and undoped states together with its structure versatility has led to multiple developments aiming at applications such as conductors, electrode materials and organic semiconductors. Some research works are conducted on polythiophene and Poly(ethylenedioxythiophene) composite. The main results are as follows:1. Poly(ethylenedioxythiophene) was prepared by oxidative polymerization, By changing the polymerization conditions, we can get a series of products. The resulted materials were characterized by scanning electron microscopy (SEM) and four-probe measurements. It was found that the conductivity of PEDOT/SiO2 composite is higher when the reaction time was 10h, the quality percentage of TSANa was 10%, the molar ratio of FeCl3 to EDOT was 0.8, and reaction temperature was 60℃.2. Monodispersed silicon dioxide spherical particles have been prepared by hydrolysis of tetraethoxy silane (TEOS) in alcohol-water mixed solvents and using ammonia as a catalyst. The resulted materials were characterized by scanning electron microscopy (SEM) and X-ray photoelectron spectroscopy (XPS). Silica microsphere was modified in order to make the surface of silica have sulfonic group(-SO3H). The resulted materials were also characterized by scanning electron microscopy (SEM) and X-ray photoelectron spectroscopy (XPS). Poly(ethylenedioxythiophene)/Silica (PEDOT/SiO2) composite was prepared by oxidative polymerization of ethylenedioxythiophene (EDOT) in presence of SiO2 (the surface have sulfonic group). During the polymerization, FeCl3 and toluene-p-sulfonic acid sodium salt (TSANa) act as oxidant and dopant respectively. The resulted materials were characterized by X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM) and four-probe measurements. It was found that the conductivity of PEDOT/SiO2 composite is higher when the molar ratio of FeCl3 to EDOT was 0.8, the quality percentage of TSANa was 6%, and the reaction time was 4h.3. The surface of polystyrene with sulfonic group(-SO3H) was prepared by emulsion polymerization. The resulted materials were characterized by scanning electron microscopy (SEM) and X-ray photoelectron spectroscopy (XPS). Poly(ethylenedioxythiophene)/Silica (PEDOT/SiO2) composite was prepared by oxidative polymerization of ethylenedioxythiophene (EDOT) in presence of SiO2 (the surface have sulfonic group). During the polymerization, FeCl3 and toluene-p-sulfonic acid sodium salt (TSANa) act as oxidant and dopant respectively. The resulted materials were characterized by X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM) and four-probe measurements. It was found that the conductivity of PEDOT/SiO2 composite is higher when the reaction time was 4h, the quality percentage of TSANa was 9%, and reaction temperature was 60℃.