Comparison of PEDOT Films Obtained via Three Different Routes through Spectroelectrochemistry and the Differential Cyclic Voltabsorptometry Method (DCVA)

Abstract

The performance of different poly(3,4-ethylenedioxythiophene) (PEDOT) films was compared by electrochemical, spectroelectrochemical, and time-derivative measurements of absorbance versus potential (linear potential-scan voltabsorptometry) for an overall spectroelectrochemical characterization of the electrochromic properties in ionic liquids such as 1-butyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide (BMITFSI). The time-derivative signals were monitored at different wavelengths, and information obtained therefrom was complementary to that obtained from conventional cyclic voltammetry. PEDOT films prepared via in situ chemical oxidative polymerization appeared to be much more efficient than electropolymerized and PEDOT-poly(styrenesulfonate) (PSS) reference films, in terms of both contrast ratio and coloration efficiency, which was the case even for PEDOT films deposited on less conductive flexible plastic substrates.

New Roll‐to‐Roll Processable PEDOT‐Based Polymer with Colorless Bleached State for Flexible Electrochromic Devices

“…Conjugated polymers are one of the main classes of materials that exhibit EC properties as thin films. [3,6,11,[18][19][20][21][22][23] A drawback of most ECPs is the lack of a highly transmissive and fully colorless bleached state. ECPs, therefore, are a large-scale and low-cost solution for ECDs since they can be coated on flexible plastic substrates by means of wet chemical approaches.…”

Hybrid PEDOT–Metal Nanoparticles – New Substitutes for PEDOT:PSS in Electrochromic Layers – Towards Improved Performance

“…The spectral absorbance of the polymer drastically changes depending on the level of PEDOT doping, as illustrated for PEDOT-Ag in Figure 6 (identical results were obtained for PEDOT-Au and PEDOT:PSS interfaces, bare and metallic ones, not shown). [17] We were not able to observe the plasmonic bands of the metallic NPs, probably because of their small amounts. [17] We were not able to observe the plasmonic bands of the metallic NPs, probably because of their small amounts.…”

“…[17] We were not able to observe the plasmonic bands of the metallic NPs, probably because of their small amounts. [16,17,26,88,89] As expected, the resulting coloration efficiencies do not depend on the film thickness, whereas the contrast ratio, which is highly sensitive to the absorbance in either state, reaches a very high level for the thickest sample (cf. [16,17,26,88,89] As expected, the resulting coloration efficiencies do not depend on the film thickness, whereas the contrast ratio, which is highly sensitive to the absorbance in either state, reaches a very high level for the thickest sample (cf.…”

“…known π-conjugated electrochromic polymer [16] with high coloration efficiency [17] as well as fairly high conductivity and transparency in its oxidized state. [18,19] It has been suggested for use in many domains, such as medical biosensing, [20] optoelectronic, [21] photovoltaic, [22] electrochromic devices, [18,[23][24][25][26] antistatic materials, transparent coatings, [27,28] metallization of insulating devices, [29] organic light batteries, [30] sensors, [31] and various other applications.…”

Novel chiral PEDOTs for selective recognition of 3,4-dihydroxyphenylalanine enantiomers: Synthesis and characterization

“…The spectroelectrochemically measured optical band gap (extracted from the onset of p-p* transition) of (R)-PEDOT-PP and (S)-PEDTM-PP were about 1.68 eV (about 740 nm) and 1.66 eV (about 747 nm), which is comparable to the reported optical band gap of parent PEDOT (1.6 eV). 75 This indicates that the pendant benzene group has slightly influence on the electronic properties of PEDOT.…”