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The structure and properties of PEDOT synthesized by template-free solution method.

Zhao Q, Jamal R, Zhang L, Wang M, Abdiryim T - Nanoscale Res Lett (2014)

Bottom Line: In this study, a simple one-step template-free solution method was developed for the preparation of poly(3,4-ethylenedioxythiophene) (PEDOTs) with different morphologies by adjusting various ratios of oxidant (FeCl3·6H2O) to monomer (3,4-ethylenedioxythiophene (EDOT)).The morphological analysis showed that PEDOT prepared from an oxidant/monomer ratio of 3:1 displayed a special coral-like morphology, and the branches of 'coral' would adjoin or grow together with increasing content of oxidant in the reaction medium; consequently, the morphology of PEDOT changed from coral to sheets (at an oxidant/monomer ratio of 9:1).The electrochemical analysis proved that the PEDOT prepared from an oxidant/monomer ratio of 3:1 had the lowest resistance and the highest specific capacitances (174 F/g) at a current density of 1 A/g with a capacity retention rate of 74% over 1,500 cycles, which indicated that the PEDOT with a coral-like morphology could be applied as a promising electrode material for supercapacitors.

View Article: PubMed Central - HTML - PubMed

Affiliation: Key Laboratory of Petroleum and Gas Fine Chemicals, Educational Ministry of China, School of Chemistry and Chemical Engineering, Xinjiang University, Urumqi 830046, People's Republic of China ; Key Laboratory of Functional Polymers, Xinjiang University, Urumqi 830046, People's Republic of China.

ABSTRACT
In this study, a simple one-step template-free solution method was developed for the preparation of poly(3,4-ethylenedioxythiophene) (PEDOTs) with different morphologies by adjusting various ratios of oxidant (FeCl3·6H2O) to monomer (3,4-ethylenedioxythiophene (EDOT)). The results from structural analysis showed that the structure of PEDOT was strongly affected by the oxidant/monomer ratio, and the polymerization degree, conjugation length, doping level, and crystallinity of PEDOT decreased with increasing of the oxidant/monomer ratio. The morphological analysis showed that PEDOT prepared from an oxidant/monomer ratio of 3:1 displayed a special coral-like morphology, and the branches of 'coral' would adjoin or grow together with increasing content of oxidant in the reaction medium; consequently, the morphology of PEDOT changed from coral to sheets (at an oxidant/monomer ratio of 9:1). The electrochemical analysis proved that the PEDOT prepared from an oxidant/monomer ratio of 3:1 had the lowest resistance and the highest specific capacitances (174 F/g) at a current density of 1 A/g with a capacity retention rate of 74% over 1,500 cycles, which indicated that the PEDOT with a coral-like morphology could be applied as a promising electrode material for supercapacitors.

No MeSH data available.


The possible mechanism for formation of the different morphologies of PEDOT. (a) 3:1, (b) 6:1, and (c) 9:1.
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Figure 5: The possible mechanism for formation of the different morphologies of PEDOT. (a) 3:1, (b) 6:1, and (c) 9:1.

Mentions: Figure 5 shows the possible mechanism for formation of different morphologies of PEDOT to explain the regular variation at various ratios of oxidant (FeCl3·6H2O) to the EDOT. According to the previous report, the quick propagation of PEDOT chains happens in a limited time under rapid initiated condition, and a lot of initial nanofibrous oligomers can be formed in the early stage[18]. Furthermore, as the polymerization time increases, the EDOT species including the monomer and the newly formed nanofibrous oligomers can act as a soft template for the formation of the nanofibrous structures[18]. Therefore, it can be concluded that the coral-like morphology of PEDOT occurring in the case of molar ratio of [FeCl3·6H2O]/[EDOT] at 3:1 mainly resulted from nanofibers growing together (or twisted nanofibers), which are formed from a soft template effect of nanofibrous oligomers. When increasing the concentration of FeCl3·6H2O, the content of monomer and the newly formed nanofibrous oligomers is relatively reduced. And with increasing content of FeCl3·6H2O, the branches of ‘coral’ will adjoin or grow together and consequently lead to a morphology of mixing up tentacles with sheets in the case of the molar ratio of [FeCl3·6H2O]/[EDOT] at 6:1, a and sheet-like morphology for PEDOT from the molar ratio of [FeCl3·6H2O]/[EDOT] at 9:1.


The structure and properties of PEDOT synthesized by template-free solution method.

Zhao Q, Jamal R, Zhang L, Wang M, Abdiryim T - Nanoscale Res Lett (2014)

The possible mechanism for formation of the different morphologies of PEDOT. (a) 3:1, (b) 6:1, and (c) 9:1.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4196207&req=5

Figure 5: The possible mechanism for formation of the different morphologies of PEDOT. (a) 3:1, (b) 6:1, and (c) 9:1.
Mentions: Figure 5 shows the possible mechanism for formation of different morphologies of PEDOT to explain the regular variation at various ratios of oxidant (FeCl3·6H2O) to the EDOT. According to the previous report, the quick propagation of PEDOT chains happens in a limited time under rapid initiated condition, and a lot of initial nanofibrous oligomers can be formed in the early stage[18]. Furthermore, as the polymerization time increases, the EDOT species including the monomer and the newly formed nanofibrous oligomers can act as a soft template for the formation of the nanofibrous structures[18]. Therefore, it can be concluded that the coral-like morphology of PEDOT occurring in the case of molar ratio of [FeCl3·6H2O]/[EDOT] at 3:1 mainly resulted from nanofibers growing together (or twisted nanofibers), which are formed from a soft template effect of nanofibrous oligomers. When increasing the concentration of FeCl3·6H2O, the content of monomer and the newly formed nanofibrous oligomers is relatively reduced. And with increasing content of FeCl3·6H2O, the branches of ‘coral’ will adjoin or grow together and consequently lead to a morphology of mixing up tentacles with sheets in the case of the molar ratio of [FeCl3·6H2O]/[EDOT] at 6:1, a and sheet-like morphology for PEDOT from the molar ratio of [FeCl3·6H2O]/[EDOT] at 9:1.

Bottom Line: In this study, a simple one-step template-free solution method was developed for the preparation of poly(3,4-ethylenedioxythiophene) (PEDOTs) with different morphologies by adjusting various ratios of oxidant (FeCl3·6H2O) to monomer (3,4-ethylenedioxythiophene (EDOT)).The morphological analysis showed that PEDOT prepared from an oxidant/monomer ratio of 3:1 displayed a special coral-like morphology, and the branches of 'coral' would adjoin or grow together with increasing content of oxidant in the reaction medium; consequently, the morphology of PEDOT changed from coral to sheets (at an oxidant/monomer ratio of 9:1).The electrochemical analysis proved that the PEDOT prepared from an oxidant/monomer ratio of 3:1 had the lowest resistance and the highest specific capacitances (174 F/g) at a current density of 1 A/g with a capacity retention rate of 74% over 1,500 cycles, which indicated that the PEDOT with a coral-like morphology could be applied as a promising electrode material for supercapacitors.

View Article: PubMed Central - HTML - PubMed

Affiliation: Key Laboratory of Petroleum and Gas Fine Chemicals, Educational Ministry of China, School of Chemistry and Chemical Engineering, Xinjiang University, Urumqi 830046, People's Republic of China ; Key Laboratory of Functional Polymers, Xinjiang University, Urumqi 830046, People's Republic of China.

ABSTRACT
In this study, a simple one-step template-free solution method was developed for the preparation of poly(3,4-ethylenedioxythiophene) (PEDOTs) with different morphologies by adjusting various ratios of oxidant (FeCl3·6H2O) to monomer (3,4-ethylenedioxythiophene (EDOT)). The results from structural analysis showed that the structure of PEDOT was strongly affected by the oxidant/monomer ratio, and the polymerization degree, conjugation length, doping level, and crystallinity of PEDOT decreased with increasing of the oxidant/monomer ratio. The morphological analysis showed that PEDOT prepared from an oxidant/monomer ratio of 3:1 displayed a special coral-like morphology, and the branches of 'coral' would adjoin or grow together with increasing content of oxidant in the reaction medium; consequently, the morphology of PEDOT changed from coral to sheets (at an oxidant/monomer ratio of 9:1). The electrochemical analysis proved that the PEDOT prepared from an oxidant/monomer ratio of 3:1 had the lowest resistance and the highest specific capacitances (174 F/g) at a current density of 1 A/g with a capacity retention rate of 74% over 1,500 cycles, which indicated that the PEDOT with a coral-like morphology could be applied as a promising electrode material for supercapacitors.

No MeSH data available.