A comparison of charge transport behavior in functionalized and non-functionalized poly 3,4-(ethylenedioxythiophene) films

Deepa, Melepurath; Bhandari, Shweta; Kant, Rama

doi:10.1016/j.electacta.2008.09.010

Cited by 17 publications

(12 citation statements)

References 37 publications

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“…The RMS roughness of pristine PET/ITO was in the range of 1–2 nm, so the roughness values of the electrodeposited films could be attributed exclusively to the polymer surfaces. In literature similar morphologies for electrodeposited PEDOT derivatives were found 34…”

Section: Resultssupporting

confidence: 63%

Electrochemical synthesis of PEDOT derivatives bearing imidazolium‐ionic liquid moieties

Döbbelin

Pozo‐Gonzalo

Marcilla

et al. 2009

J. Polym. Sci. A Polym. Chem.

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Novel poly(3,4-ethylenedioxythiophene) (PEDOT) polymers bearing imidazolium-ionic liquid moieties were synthesized by electrochemical polymerizations. For this purpose, new functional monomers were synthesized having an 3,4-ethylenedioxythiophene (EDOT) unit and an imidazolium-ionic liquid with different anions such as tetrafluoroborate (BF À 4 ), bis(trifluoromethane)sulfonimide ((CF 3 SO 2 ) 2 N À ), and hexafluorophosphate (PF À 6 ). Next, polymer films were obtained by electrochemical synthesis in dicholoromethane solutions. Obtained polymers were characterized, revealing the characteristics of PEDOT in terms of electrochemical and spectroelectrochemical properties, FTIR, 1 H NMR, and AFM microscopy. Interestingly, the hydrophobic character of electropolymerized films could be modified depending on the anion type. The hydrophobicity followed the trend PF À 6 [ (CF 3 SO 2 ) 2 N À [ BF À 4 [ pure PEDOT as determined by water contact angle measurements. Furthermore, the polymers could be dissolved in a range of polar organic solvents such as dimethylformamide, propylene carbonate, and dimethyl sulfoxide making these polymers interesting candidates for wet processing methods.

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Section: Resultssupporting

confidence: 63%

Electrochemical synthesis of PEDOT derivatives bearing imidazolium‐ionic liquid moieties

Döbbelin

Pozo‐Gonzalo

Marcilla

et al. 2009

J. Polym. Sci. A Polym. Chem.

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“…2.1 Synthesis of PEDOT, PANI and PB films A 0.07 M 3,4-ethylenedioxythiophene (EDOT, Aldrich), 0.25 M sodium dioctyl sulfosuccinate solution in deionized water was used for electropolymerization under constant dc potential of +1.2 V for 240 s. 20 An inorganic transparent electrode (SnO 2 : F coated glass) was used as working electrode, a platinum sheet (Aldrich) as counter electrode and a Ag/AgCl/KCl electrode was used as reference. A 0.4 M solution of C 6 H 5 NH 2 (aniline, Merck), double distilled at B100 1C at ambient pressure, 0.2 N HCl and 0.05 M LiN(CF 3 SO 2 ) 2 (lithium bis(trifluoromethanesulfonyl)imide, 3 M) in deionized water was used for potentiodynamic electropolymerization of aniline in the voltage range of À0.2 to +1.1 V for ten cycles in a three-electrode electrochemical cell, similar to the above-described one.…”

Section: Methodsmentioning

confidence: 99%

“…PEDOT films have been grown from an economical route involving an aqueous formulation of the monomer EDOT with an anionic surfactant. 20 The surfactant in the electropolymerization bath in addition to supplying counterions also controls the nanostructures of the resulting polymer deposit: grain size, distribution and porosity. [21][22][23] So that a facile exchange of ions is effected during the electrochemical measurements of the PEDOT-PANI device encompassing the imide based gel electrolyte, a small quantity of lithium imide was also added to the electropolymerization bath of PANI film as this enabled the doping of the radical cation by both chloride and imide ions.…”

Section: Introductionmentioning

confidence: 99%

Electrochemistry of poly(3,4-ethylenedioxythiophene)-polyaniline/Prussian blue electrochromic devices containing an ionic liquid based gel electrolyte film

Deepa

Awadhia

Bhandari

2009

Phys. Chem. Chem. Phys.

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Electrochromic devices based on poly(3,4-ethylenedioxythiophene) (PEDOT) as the cathodic coloring electrode and polyaniline (PANI) or Prussian blue (PB) as the counter electrode containing a highly conductive, self-supporting, distensible and transparent polymer-gel electrolyte film encapsulating an ionic liquid, 1-butyl-1-methylpyrrolidiniumbis-(trifluoromethylsulfonyl)imide, have been fabricated. Polarization, charge transfer and diffusion processes control the electrochemistry of the functional electrodes during coloration and bleaching and these phenomena differ when PEDOT and PANI/PB were employed alternately as working electrodes. While the electrochemical impedance response shows good similitude for PEDOT and PANI electrodes, the responses of PEDOT and PB were significantly different in the PEDOT-PB device, especially during reduction of PB, wherein the overall amplitude of the impedance response is enormous. Large values of the coloration efficiency maxima of 281 cm 2 C À1 (l = 583 nm) and 274 cm 2 C À1 (l = 602 nm), achieved at À1.0 and À1.5 V for the PEDOT-PANI and PEDOT-PB devices have been correlated to the particularly low magnitude of charge transfer resistance and high polarization capacitance operative at the PEDOT-ionic liquid based electrolyte interface at these dc potentials, thus allowing facile ion-transport and consequently resulting in enhanced absorption modulation. Moderately fast switching kinetics and the ability of these devices to sustain about 2500 cycles of clear-to-dark and dark-to-clear without incurring major losses in the optical contrast, along with the ease of construction of these cells in terms of high scalability and reproducibility of the synthetic procedure for fabrication of the electrochromic films and the ionic liquid based gel electrolyte film, are indicators of the promise these devices hold for practical applications like electrochromic windows and displays.

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“…The double layer capacitance charge [22,23] causes the abrupt rise in the initial current under both potentials, and peak heights are 0.0080 and 0.0004 A under +1.8 and +1.2 V, respectively. An exponential decay follows (inset of Figure 1 a).…”

Section: Deposition Profilesmentioning

confidence: 98%

A Dual Electrochrome of Poly‐(3,4‐Ethylenedioxythiophene) Doped by N,N′‐Bis(3‐sulfonatopropyl)‐4‐4′‐bipyridinium—Redox Chemistry and Electrochromism in Flexible Devices

et al. 2010

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An electrochromic zwitterionic viologen, N,N'-bis(3-sulfonatopropyl)-4-4'-bipyridinium, has been used for the first time for doping poly (3,4-ethylenedioxythiopene) (PEDOT) films during electropolymerization. Slow and fast diffusional rates for the monomer at deposition potentials of +1.2 and +1.8 V, respectively yielded the viologen-doped PEDOT films with granular morphology and with dendrite-like shapes. The dual electrochrome formed at +1.8 V, showed enhanced coloration efficiency, larger electrochemical charge storage capacity, and superior redox activity in comparison to its analogue grown at +1.2 V, thus demonstrating the role of dendritic shapes in amplifying electrochromism. Flexible electrochromic devices fabricated with the viologen-doped PEDOT film grown at +1.8 V and Prussian blue with an ionic liquid-based gel electrolyte film showed reversible coloration between pale and dark purple with maximum coloration efficiency of 187 cm2C(-1) at lambda=693 nm. The diffusional impedance parameters and switching kinetics of the device showed the suitability of this dual electrochrome formed as a single layer for practical electrochromic cells.

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A comparison of charge transport behavior in functionalized and non-functionalized poly 3,4-(ethylenedioxythiophene) films

Cited by 17 publications

References 37 publications

Electrochemical synthesis of PEDOT derivatives bearing imidazolium‐ionic liquid moieties

Electrochemical synthesis of PEDOT derivatives bearing imidazolium‐ionic liquid moieties

Electrochemistry of poly(3,4-ethylenedioxythiophene)-polyaniline/Prussian blue electrochromic devices containing an ionic liquid based gel electrolyte film

A Dual Electrochrome of Poly‐(3,4‐Ethylenedioxythiophene) Doped by N,N′‐Bis(3‐sulfonatopropyl)‐4‐4′‐bipyridinium—Redox Chemistry and Electrochromism in Flexible Devices

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