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Preparation, Characterization And Applications Of Nano-conducting Polymer: Poly(3,4-ethylenedioxythiophene)

Posted on:2011-06-11Degree:MasterType:Thesis
Country:ChinaCandidate:J J XuFull Text:PDF
GTID:2121360305499376Subject:Analytical Chemistry
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The conducting polymers have attracted many attentions of scientists all around the world since its first synthesis in 1977 by Hideki Shirakawa et al as a new idea for conducting. Meanwhile, these materials have been studied wildly for their unique properties, such as good conducting capacity, plasticity, corrosion resistance and low cost.Benefit from their electronic merits, nano-scale advancement, and optimization from other functional groups/procedures, the conducting polymer nano-composites display excellent characters for electron components, bio-mebranes, green energy resources, invisible materials and anti-corruption materials. Thus, the conducting polymer nano-composites own a bright application future in polymer chemistry, materialogy and life science.Among various conducting polymers, poly(3,4-ethylenedioxythiophene) is one of the most attractive. Not only for its good conducting capacity and plasticity, but also for its good stability, transparence, spectroelectrochemiscal properties and bio-compatibility, PEDOT has been widely studied as biosensors, photoelectric components, super capacities, solar battery, absorbing material, superconductors and information storages. The hot researches must lead to an abroad application on PEDOT in a near future.The main work of this paper focuses on the design, synthesis, characterization, and application study of the PEDOT nanocomposites. We try our best to combine conducting polymer, nano technology, biochemistry and spectroelectrochemisry. This paper concludes following aspects:Chapter 1:IntroductionIntroduce the scheme, features and current study situation of the conducting polymer nanocomposites. The biomacromolecular immobilization methods, traits, and biosensing in conducting polymer nano compounds are summarized, as well as the click chemistry, its application in conducting polymer functionalization. Chapter 2:A highly soluble poly(3,4-ethylenedioxythiophene)-poly(styrene sulfonic acid)/Au nanocomposite for horseradish peroxidase immobilization and biosensingA highly soluble poly(3,4-ethylenedioxythiophene)-poly(styrene sulfonic acid)/Au (PEDOT-PSS/Au) nanocomposite was prepared via one-step chemical synthesis and the matrix was characterized by UV-Vis spectroscopy (UV-Vis), Fourier transform infrared spectroscopy (FT-IR), scanning electron microscope (SEM) and transmission electron microscope (TEM). The PEDOT/PSS-Au nanocomposite can be used as an excellent biomaterial for enzymes immobilization. In this system, redox enzyme, horseradish peroxidase (HRP) was selected as a target and the direct electron transfer of HRP was observed. Moreover, we find that the HRP/PEDOT-PSS/Au modified electrode displayed an excellent electrocatalytic performance for H2O2 and the formal Michaelis-Menten constant (Kmapp)was 0.78 mmol/L. The response currents had a good linear relation with the concentration of H2O2 with a linear range from 2.0×10-7 to 3.8×10-4 mol/L.Chapter 3:Ferrocene clicked poly(3,4-ethylenedioxythiophene) conducting polymer:Characterization, electrochemical and electrochromic propertiesThe "click" chemistry, Cu(I)-catalyzedazide-alkynecyclo additionreaction, was applied to covalently functionalize the poly(3,4-ethylenedioxythiophene)(PEDOT) conducting polymer film with an excellent electron transfer mediator(ferrocene). Scanning electron microscopy(SEM), Fourier transform infrared spectroscopy(FT-IR), and Raman spectroscopy were used to characterize the ferrocene-grafted PEDOT conducting polymer film, and it was proved that the grafting procedure via click reaction had a high efficiency. The ferrocene groups covalently grafted in the polymer films turned out to own a relatively fast electron transfer rate and show multi-color states via adjusting applied potential.Chapter 4:Synthesis of PEDOT/MWNTs nanocomposites via click chemistry and study of the electrochemical and electrochromic propertiesThe poly(3,4-ethylenedioxythiophene)(PEDOT) was functionalized with Multi wall Nano Tubes(MWNTs) vis the "click" chemistry. Scanning electron microscopy(SEM), Fourier transform infrared spectroscopy(FT-IR), and Uv-vis spectrum(UV) were used to characterize the PEDOT/MWNTs conducting polymer film. The MWNT groups covalently grafted in the polymer films turned out to own a relatively high contrast, fast electron transfer rate and show great capacity properties.
Keywords/Search Tags:Conducting polymer, Click reaction, protein immobilization, HRP, Ferrocene, MWNT, Electrochemistry, Electrochromicproperty
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