Studies On Solid-state Synthesis And Properties Of Derivatives Of Polythiophene/Nano TiO₂、GNP Conducting Polymers Composites

Conducting polymers got increasingly attentions Due to their characteristics ofthe polymers and metals. Among conducting polymers, polythiophene and itsderivatives have attracted considerable attention due to their unique combination oforiginal electronic properties, environmental stability and structural versatility. In thispaper, a series of hybrid materials were synthesized by solid-state synthesis methodwith the conductiing polymers as organic phase, while the nano-TiO2and GNP asinorganic phase. And the structure and morphology of the composites as well as theelectrochemical properties and photocatalytic activity were discussed carefully via aseries of testing. The details are summarized as follows:(1) Poly(3,4-propylenedioxythiophene)/TiO2nanocomposite (PProDOT/TiO2)materials were synthesized by using the mechanochemical solvent-free andchemical solution method. The effects of the synthetic methods and TiO2on thestructural and physicochemical properties of the resulting composites were discussed.The results showed that the mechanochemical solvent-free method is more idealmethod for synthesize conducting polymer/TiO2nanocomposite than chemicalsolution method. Moreover，with the contribution of TiO2, the PProDOT/TiO2nanocomposite synthesized by mechanochemical or chemical solution methoddisplayed higher electrochemical activity than pure PProDOT.(2) The polyterthiophene derivatives/TiO2nanocomposites, such as poly(3,4-propylenedioxy-2,2’:5’,2"-terthiophene)/TiO2nanocomposite (poly(TPT)/TiO2) andpoly(3,4-(2,2-dimethylenepropylenedioxy)-2,2’:5’,2"-terthiophene)/TiO2nanocompo-site(poly(TMPT)/TiO2) were synthesized by a simple solid-state method. Thepoly(3,4-propylenedioxythiophene)/TiO2nanocomposite (PProDOT/TiO2) andpoly(3,4-2,2-dimethylenepropylenedioxythiophene)/TiO2nanocomposite (PProDOT-Me2/TiO2) were synthesized by same method for comparison. The results showed that,the poly(TPT)/TiO2and poly(TMPT)/TiO2have higher oxidation degree and conjugation length than that of PProDOT/TiO2and PProDOT-Me2/TiO2. And thepoly(TPT)/TiO2and poly(TMPT)/TiO2nanocomposites have higher degradationefficiency than that of PProDOT/TiO2and PProDOT-Me2/TiO2nanocomposites.Furthermore, the photodegradation studies also suggested that the polyterthiophenederivatives/TiO2nanocomposites are more effective photocatalysts for the degradationof MB under UV and sunlight irradiation.(3) The binary and ternary composite materials of poly(3,4-ethylenedioxy-thiophene), nano titanium dioxide and graphene nano-platelet (PEDOT/TiO2,PEDOT/GNP, PEDOT/TiO2/GNP) were synthesized by solid-state heating method.The results showed that the PEDOT/GNP and pure PEDOT had the higherpolymerization degree and conjugation length than that of PEDOT/TiO2andPEDOT/TiO2/GNP. The results also showed that the composites exhibited a betterphotocatalytic effect on MB dyes degradation under both of light sources than purePEDOT.(4) Binary and ternary composite materials of poly(3’,4’-ethylenedioxy-2,2’:5’,2"-terthiophene)(poly(TET)), nano titanium dioxide and graphene nano-platelet(poly(TET)/TiO2, poly(TET)/GNP, poly(TET)/TiO2/GNP) were synthesized bysolid-state heating method. The results showed that the TiO2and GNP enhancing theoxidation and conjugation degree of nanocomposites. And the composites exhibited abetter photocatalytic activity on MB dyes degradation under both of light sources thanpure poly(TET).(5) The poly(3,4-propylenedioxy-2,2’:5’,2"-terthiophene)(poly(TPT)), poly(3,4-(2,2-dimethylenepropylenedioxy)-2,2’:5’,2"-terthiophene)(poly(TMPT)) and binaryand ternary composite materials of poly(TPT), poly(TMPT), TiO2and GNP weresynthesized by solid-state heating method. The results showed that poly(TPT)/GNPand poly(TMPT)/GNP displayed highest degradation efficiency and poly(TPT)/TiO2/GNP, poly(TMPT)/TiO2/GNP exhibited better photocatalytic activity than poly(TPT)/ TiO2and poly(TMPT)/TiO2.