Solid-state Synthesis And Properties Of Polythiophene Derivative/GNP, Au Composites

Polyterthiophene is an increasingly subject to everyone’s attention due to its special reactivesites capable of forming stable polymers compared with the common conducting polymerPANI and polypyrrole. The composite of polyterthiophene with graphene(GNP) can eitherhave a polymer of good electrical conductivity, but also has the characteristics mechanical,thermal, and optical and other good properties of graphene. The applications ofpolythiophene/graphene composite as supercapacitors are acroused more and more attention.Similarly, polyterthiophene/Au nanoparticle composites in terms of the sensors also havebecome more nature. In this paper, polyterthiophene/GNP composite material,polyterthiophene/Au nanoparticles composite materials and PEDOT/Au/GNP nanoparticlecomposites were synthesized by solid-state method. The characteristic of the structure andmorphology and the properities focusing on composites as supercapacitors andelectrochemical sensors performance were investigated. The main results are as follow:1．Fe (OTS)3as an oxidizing agent, to explore the effect of monomer ratio of theoxidizing agent to the composites. Poly(3’,4’-ethylenedioxy-2,2’:5’,2"-terthiophene)/graphene(poly(TET)/GNP) composite materials were synthesized by solid-state method. The resultsshowed that: when the molar ratio of oxidant Fe (OTS)3to TET monomer is3:1, thecomposite has better oxidation and doping effects and good electrochemical performance.2． The Fe (OTS)3as oxidant, TET as monomer and graphene nanoplatelets as inorganicmaterial, the composites were synthesized by solid-state method according to the varying ofGNP from4wt%to16wt%. The results suggested that the composite of (poly(TET)/GNP(12wwt%) has a long conjugated structure and better electrochemical properties than othercomposites. The composite of poly (TET)/GNP (12wt%) also has an exellent specificcapacitance of206F g-1and excellent capacitance retention of78%.3. The poly (3’,4’-propylenedioxy-2,2’:5’,2"-terthiophene)/graphene (poly(TPT)/GNP)composite and poly (3’,4’-(2,2-dimethyl)propylenedioxy-2,2’:5’,2"-terthiophene)/graphene(poly(TMPT)/GNP) composites were synthized by solid-state heating method and the ball milling method. The effects of different methods and different substituents on theelectrochemical properties of the composite material were discussed carefully. The resultsexhibit that poly (TMPT)/GNP composite by solid-state heating method has preferablyelectrochemical performance. While the composite of poly (TPT)/GNP by ball millingmechanochemical method has preferably electrochemical performances.4. The composites of3’,4’-propylenedioxy-2’:5’,2"-terthiophene/Au (poly (TPT)/Au) and3,4-propylenedioxythiophene (PProDOT/Au) both were synthesized by mechanochemicalmethod, and were used to detect IO3-. And the result shows that PProDOT/Au composite hasa better current response as sensors to detect of IO3-than poly (TPT)/Au composite.5. Polythiophene derivative with binary and ternary composites of poly (TPT)/Au, poly(TPT)/Au/GNP, PProDOT/Au and PProDOT/Au/GNP were synthized by polymer reductionmethod. The composites were discussed as electrochemical sensor applications of detection ofIO3-were also explored. The polymers all having relatively broad electron acceptance andrelease function, which can be used to obtain a direct reduction of HAuCl4to be Au particles,the Au nanoparticals can be dispersed on the graphene surface of the composite material sothat the electrocatalytic process would easier. The results suggest that the binary and ternarycomposites synthesized successfully and the electrocatalytic activity of the composites wouldbe enhanced.6. It is important that the Au nanoparticles are uniformly dispersed into the polymer. TheAu nanoparticles first prepared using a sol-gel method, and then use the brominated EDOT asmonomer at high temperatures can debromination, the polymerization can occur in thisprocess enables the Au particles are dispersed in the PEDOT/Au/GNP composite. Theelectrocatalytic properties discussed carefully, the results showed that PEDOT/Au/GNPcomposites have good electrochemical response for NO2-and IO3-.