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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.


Raman spectra (a) and XRD patterns (b) of PEDOT (3:1), PEDOT (6:1), and PEDOT (9:1).
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Figure 2: Raman spectra (a) and XRD patterns (b) of PEDOT (3:1), PEDOT (6:1), and PEDOT (9:1).

Mentions: Some information about the structure of PEDOTs has been achieved by the analysis of Raman spectra (λexc =1,064 nm). As seen from Figure 2a, the bands at 438, 700, 991, and 1,256 cm-1 are assigned to the C-O-C deformation, symmetric C-S-C deformation, oxyethylene ring deformation, and Cα-Cα inter-ring stretching, respectively. Especially, the characteristic band at 1,425 cm-1 due to symmetric Cα = Cβ (-O) stretching is indicative of a high level of conjugation in the structure of PEDOT[29-31]. Lee et al. have already found that a characteristic band corresponding to the stretching vibration of C = C becomes narrow, which could prove a change of resonance structure of the PEDOT chain from a benzoid to a quinoid[32]. A similar phenomenon is observed for PEDOT (3:1), in which the band at 1,425 cm-1 becomes narrow, implying that PEDOT (3:1) has a longer degree of conjugate length.


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)

Raman spectra (a) and XRD patterns (b) of PEDOT (3:1), PEDOT (6:1), and PEDOT (9:1).
© Copyright Policy - open-access
Related In: Results  -  Collection

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

Figure 2: Raman spectra (a) and XRD patterns (b) of PEDOT (3:1), PEDOT (6:1), and PEDOT (9:1).
Mentions: Some information about the structure of PEDOTs has been achieved by the analysis of Raman spectra (λexc =1,064 nm). As seen from Figure 2a, the bands at 438, 700, 991, and 1,256 cm-1 are assigned to the C-O-C deformation, symmetric C-S-C deformation, oxyethylene ring deformation, and Cα-Cα inter-ring stretching, respectively. Especially, the characteristic band at 1,425 cm-1 due to symmetric Cα = Cβ (-O) stretching is indicative of a high level of conjugation in the structure of PEDOT[29-31]. Lee et al. have already found that a characteristic band corresponding to the stretching vibration of C = C becomes narrow, which could prove a change of resonance structure of the PEDOT chain from a benzoid to a quinoid[32]. A similar phenomenon is observed for PEDOT (3:1), in which the band at 1,425 cm-1 becomes narrow, implying that PEDOT (3:1) has a longer degree of conjugate length.

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.