Photophysics of poly(3,4-ethylenedioxythiophene) covered by permodified γ-cyclodextrin

A.-M. Resmerita; A. Costea; F. Farcas; A. Rotaru; A. Farcas

doi:10.1117/12.2572091

31 December 2020 Photophysics of poly(3,4-ethylenedioxythiophene) covered by permodified γ-cyclodextrin

A.-M. Resmerita, A. Costea, F. Farcas, A. Rotaru, A. Farcas

Proceedings Volume 11718, Advanced Topics in Optoelectronics, Microelectronics and Nanotechnologies X; 117182K (2020) https://doi.org/10.1117/12.2572091
Event: Advanced Topics in Optoelectronics, Microelectronics and Nanotechnologies 2020, 2020, Online Only

Abstract

Poly(3,4-ethylenedioxythiophene/permethylated γ-cyclodextrin) polyrotaxane (PEDOT∙TMγCD) having bulky triphenylmethyl as stoppers was synthesized by the chemical oxidation of 3,4-ethylenedioxythiophene (EDOT) as an inclusion complex with 2,3,6-tri-O-methyl γ-cyclodextrin (TMγCD) (EDOT∙TMγCD) with a five-fold excess of iron (III) chloride oxidant over the stoichiometric amount in water. For a comparison, the reference PEDOT was synthesized under the same experimental conditions. The chemical structures of the synthesized compounds were proved by FT-IR and NMR spectroscopies. The coverage ratio of the EDOT and PEDOT backbones was found to be of 80.0 % and 43.7 %, respectively. Differential scanning calorimetry (DSC) studies of both PEDOT and PEDOT∙TMγCD samples showed no crystallization or melting peaks in the range 20-200 °C. The PEDOT∙TMγCD as dark-green powders was enough soluble in acetone, dichloromethane, CHCl₃ and THF compared with those of the reference PEDOT. The optical properties of the PEDOT and PEDOT∙TMγCD compounds were investigated by UV-Vis. The UV-Vis absorption spectrum of PEDOT∙TMγCD in THF is consistent with the spectrum of the PEDOT in DMSO. Atomic force microscopy, AFM, indicated that the PEDOT∙TMγCD film is more uniformly distributed over the substrate area compared with those of the reference PEDOT. The electrochemical data provided that the investigated PEDOT∙TMγCD exhibited n- and p-doping processes. The HOMO/LUMO energy level indicates that the investigated PEDOT∙TMγCD polyrotaxane is electrochemically accessible as electron-transporting material in electronic devices.

Citation Download Citation

A.-M. Resmerita, A. Costea, F. Farcas, A. Rotaru, and A. Farcas "Photophysics of poly(3,4-ethylenedioxythiophene) covered by permodified γ-cyclodextrin", Proc. SPIE 11718, Advanced Topics in Optoelectronics, Microelectronics and Nanotechnologies X, 117182K (31 December 2020); https://doi.org/10.1117/12.2572091

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KEYWORDS

Atomic force microscopy

Polymerization

FT-IR spectroscopy

Molecules

Samarium

Absorption

Molecular interactions

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