Helical Carbon and Graphite Films Prepared from Helical Poly(3,4‐ethylenedioxythiophene) Films Synthesized by Electrochemical Polymerization in Chiral Nematic Liquid Crystals

Matsushita, Satoshi; Yan, Bairu; Yamamoto, Sadahiro; Jeong, Yongsoo; Akagi, Kazuo

doi:10.1002/ange.201308462

Cited by 8 publications

(6 citation statements)

References 25 publications

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“…[14] Achiral additive could result in chiral reorganization of this peculiar interphase,a si nt he case of nematic-to-cholesteric transitions induced by chiral dopants in liquid crystals. [15] This reorganization would depend on both additive nature and concentration;o ur inherently chiral double salt additives could be particularly effective.T hus,the electron transfer process would take place within ah ighly ordered chiral interface.S ome specific direct interaction between chiral additive and probe at the interphase could also be considered.…”

Section: Angewandte Chemiementioning

confidence: 99%

“Inherently Chiral” Ionic‐Liquid Media: Effective Chiral Electroanalysis on Achiral Electrodes

et al. 2017

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Section: Angewandte Chemiementioning

confidence: 99%

“Inherently Chiral” Ionic‐Liquid Media: Effective Chiral Electroanalysis on Achiral Electrodes

et al. 2017

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“…Many reports have discussed study chiral induction of conjugated skeletons [2][3][4][5][6][7][8][9].…”

Section: Introductionmentioning

confidence: 99%

Synthesis of a Terpene-Based New Chiral Inducer and Preparation of an Asymmetric Polymer

2015

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Abstract:A new chiral compound was synthesized based on L-borneol. A cholesteric liquid crystal (LC) electrolyte solution was prepared by adding it as a chiral inducer to a nematic LC. A chiral poly(3,4-ethylenedioxythiophene) (PEDOT*, * = asymmetry) film was prepared by electrochemical polymerization in the induced cholesteric LC. The PEDOT* film showed a maximum absorption band due to a π-π* transition in the UV-Vis absorption and bisignate Cotton effect in the reduced state in circular dichroism (CD). The CD spectrum indicates that PEDOT* backbones form right-handed helical aggregation. However, the maximum optical absorption band due to π-π* transition of the PEDOT* decreases and a new absorption band appears at long wavelengths upon oxidation due to generation of polarons as charge carriers. Bisignate Cotton effect disappears and broadly negative CD signal appears at long wavelengths in the oxidized state.

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“…) doped helical PEDOT (H-PEDOT) films as carbonization precursors that were prepared via an electrochemical polymerization in an N*-LC solution. 33 The N*-LC was provided by mixing a spot of disubstituted axially chiral binaphthyl compound with N-LC as the chiral dopant. A tetra-substituted chiral dopant was also used to provide a highly twisted N*-LC.…”

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confidence: 99%

“…A number of experiments, such as XRD and Raman scattering measurements, have been performed in previous reports to check the crystallinity of PEDOT, carbon, and graphite films. 33 In this research, the phenomenon of diamagnetic levitation was used to measure the crystallinity of the carbon and graphite films. The orbital motion of free electrons in a material makes current loops controlled by the Lorentz force.…”

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confidence: 99%

“…The XRD analyses for the Graphite-O and Graphite-N films showed that the Graphite-O has a crystallinity higher than that of Graphite-N, as described in previous reports. 33 higher crystallinity were prepared using oxidized H-PEDOT films as precursors. To produce the helical carbon film, quartz and carbon plates were used as the substrates because of their high heat resistance.…”

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confidence: 99%

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An Advanced Method for Preparation of Helical Carbon and Graphitic Films Using a Carbonization Substrate

2016

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An advanced method is proposed to prepare helical graphite films with large domains of left- and right-handed spiral morphologies which are composed of fibril bundles using oxidized PEDOT films as carbonization substrates. Helical PEDOT (H-PEDOT) films, as carbonization precursors, are prepared via an electrochemical polymerization in an asymmetric reaction solution containing the chiral nematic liquid crystal (N*-LC), the monomer bis-EDOT, and an electrolyte. The N*-LCs are provided by mixing a spot of di- or tetra-substituted, axially chiral, binaphthyl compounds as the chiral dopants with the N-LC. In addition, a new type of chiral dopant bearing a cyanobiphenyl moiety, which is the same mesogenic core as that of the parent LC [4-cyano-4′-pentylbiphenyl], is used for preparing high miscible N*-LC systems. The distances between the fibril bundles of H-PEDOTs specifically depend on the helical twisting powers of the chiral dopants. In circular dichroism spectra, the H-PEDOTs in both neutral and oxidized states exhibit clear Cotton effects. In the preparation of the helical graphite films, substrates such as quartz and carbon plates cannot retain the spiral morphologies because of the substantial difference in the thermal shrinkage between the substrate and precursor. The oxidized PEDOT film used as a promising carbonization substrate has almost the same thermal shrinkage as the H-PEDOT film, which allows for a reduction in the deformation due to thermal shrinkage during the heat treatment. As a result, helical carbon and graphite films which have distinguished spiral morphologies are obtained via heat treatment at 800 and 2600 °C, respectively.

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Helical Carbon and Graphite Films Prepared from Helical Poly(3,4‐ethylenedioxythiophene) Films Synthesized by Electrochemical Polymerization in Chiral Nematic Liquid Crystals

Cited by 8 publications

References 25 publications

“Inherently Chiral” Ionic‐Liquid Media: Effective Chiral Electroanalysis on Achiral Electrodes

“Inherently Chiral” Ionic‐Liquid Media: Effective Chiral Electroanalysis on Achiral Electrodes

Synthesis of a Terpene-Based New Chiral Inducer and Preparation of an Asymmetric Polymer

An Advanced Method for Preparation of Helical Carbon and Graphitic Films Using a Carbonization Substrate

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