Studies On Solid-state Synthesis And Properties Of Nitrogen-and Sulfur-containing Typical Conducting Polymers Composites

Because of the characteristics of the polymers and metals, conducting polymersgot more and more attentions. Especially those heteroatom conducting polymers, suchas containing nitrogen and sulfur atom, become the focus of research due to its light,electricity, sound, heat and other special properties. The hybrid materials containingconductive polymers and carbon nanotubes as well as metal nanoparticles gotextensive and deep research because of its good properties. In this paper, a series ofhybrid materials were prepared via solid-state synthesis method with the conductiingpolymers containing nitrogen and sulfur atom as organic phase, while the carbonnanotubes and metal particles （Au, Pt） as inorganic phase. And through a series oftesting and characterization of the hybrid materials, the structure and morphology aswell as the electrochemical properties of the composites were discussed carefully. Thedetails are summarized as follows:（1） The composites of poly（An-co-OMA）/MWNT were synthesized bysolid-state polymerization with different molar ratio of An and OMA. The solubilityof copolymer composites were tested with the m-cresol solvent, and theelectrochemical properties of composites were investigated. The results showed thatdifferent molar ratio of [An]/[OMA] in reaction system has great influence on theoxidation degree, doping level and electrochemical properties of the copolymers inthese composites. Most importantly, the solubility and cycling stability of copolymercomposites gets enhanced due to the join of OMA.（2） The solid-state method was applied for synthesizing the polyaniline/noblemetal hybrid materials with the presence of HAuCl₄·4H₂O or H₂PtCl₆·6H₂O inreaction medium. The results showed that HAuCl₄·4H₂O and H₂PtCl₆·6H₂O had greatinfluence on the oxidation degree and doping level of the PANI in composites. Theresults also indicated that crystalline-state Au particles did exist in the PANI matrix,while there was no Pt metal particle formed or Pt just possible existed in another form in PANI matrix prepared from the existence of H₂PtCl₆·6H₂O. The PANI/Aucomposite obtained was assembled an enzymeless H₂O₂sensor and showed fastresponse to H₂O₂and excellent performance in wide linear range.（3） The composites of PIn/MCNT were synthesized using two differentsolid-state methods. The properties of the composites were investigated and theresults showed that the reactive sites of indole were1,3and1,1-3,3in composites ofPIn/MCNT-S during the reaction, while indole in PIn/MCNT-H had more reactivesites. The electrochemical test results showed that both the two complexes had highspecific capacitance in a small current density. The long process cycle life test resultsshowed that the two electrodes materials having good electrochemical stability, whichindicated that the PIn/MCNT composites had the potential value for applying in small（micro） electronic device.（4） A simple and novel method for synthesizing of composite which containingpoly（3,4-ethylenedioxythiophene）（PEDOT） and single-walled carbon nanotubes hasbeen developed. A series of testing and characterizations showed that PEDOT/SWNTwith8wt.%SWNT had porous morphology and high specific capacitance. However,the decrease in specifc capacitance after repeated cycling was also resulted from thespecial morphology of this composite, in which the SWNT were not well dispersed inpolymer matrix to prevent the swelling and shrinkage of PEDOT in composite duringrepeated cycling.