Poly(3,4-Ethylenedioxythiophene) Micro/Nanostructures And Their Electromagnetic Functionality

Due to highly conjugated molecular structures and high conductivity likemetals, conducting polymers exhibit both electrical, optical properties of metalsand semiconductors and mechanical properties and processable advantages oftraditional polymers. Especially, conducting polymers with micro/nanostructureshave attracted great attentions of the scientists because of their excellent physicaland chemical properties. Electromagnetically functionalized micro/nanostructuresof conducting polymers are of special interest due to their potential applications inareas such as electromagnetic interference shielding, microwave absorption,nonlinear optics, molecular electronics, and biomedicine. In this thesis,Poly（3,4-ethylenedioxythiophene）（PEDOT） micro/nanostructures were preparedby a "free-template" method and electromagnetically functionalizedmicro/nanostructures of PEDOT were synthesized successfully by the "chemicalone-step" method. The main results are as the following:1. Electromagnetic poly（3,4-ethylenedioxythiophene）/γ-Fe₂O₃（PEDOT/γ-Fe₂O₃）micro-bowls,1-2μm in diameter, were prepared in the solution ofcetyltrimethylammonium bromide （CTAB） by a self-assembly process for thefirst time. FeCl₃acted as a source of FeIIIfor the formation of γ-Fe₂O₃and asan oxidant for the polymerization of3,4-ethylenedioxythiophene （EDOT）.The bowl-shaped morphology of PEDOT/γ-Fe₂O₃composites was stronglyinfluenced by the concentration of CTAB, FeCl₂, ammonia solution and thereaction temperature. The saturation magnetization of PEDOT/γ-Fe₂O₃micro-bowls increased with the increase of FeCl₂concentration and reached6.20Am²/kg at the FeCl₂mass of600mg. The maximum conductivity of 27.9S/cm for the PEDOT/γ-Fe₂O₃composites was achieved at the FeCl₂massof375mg.2. Poly（3,4-ethylenedioxythiophene）（PEDOT） micro-bowls were prepared inmany surfactant solution by a self-assembly process. The used surfactantsincluded carboxymethyl chitosam, carboxymethyl cellulose （CMC）, polyvinylalcohol （PVA） and polyacrylic acid （PAA）. The uniform bowl-shapedPEDOT can be obtained when the amount of carboxymethyl chitosam （orCMC） is8mg and12mg respectively. According to the above results,electromagnetic poly（3,4-ethylenedioxythiophene）/γ-Fe₂O₃（PEDOT/γ-Fe₂O₃）micro-bowls, were prepared by the Chemical one-step method.