Study of modified PEDOT:PSS for tuning the optical properties of its conductive thin films
The present work focuses on studying the optical properties of the pristine PEDOT:PSS and the PEDOT:PSS modified with de-ionized water, ethylene glycol and MWCNT. The effect of various additives on the absorption, the refractive index, and the dielectric constant has been inspected. The refractive...
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| Main Authors: | , |
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| Format: | Article |
| Language: | English |
| Published: |
H. : ĐHQGHN
2020
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| Subjects: | |
| Online Access: | http://repository.vnu.edu.vn/handle/VNU_123/76709 https://doi.org/10.1016/j.jsamd.2019.08.009 |
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| Institution: | Vietnam National University, Hanoi |
| Language: | English |
| Summary: | The present work focuses on studying the optical properties of the pristine PEDOT:PSS and the
PEDOT:PSS modified with de-ionized water, ethylene glycol and MWCNT. The effect of various additives
on the absorption, the refractive index, and the dielectric constant has been inspected. The refractive
index dispersion has been analyzed using the single oscillator model developed by Wemple and DiDomenico. The optical constants, such as the dispersion energy, the single oscillator energy, the average
oscillator strength, the average interband oscillator strength, the long wavelength refractive index, and
the plasma resonance frequency have been determined. The energy bandgap was found reduced with
the addition of EG and MWCNT representing a red shift and a conformational change in the PEDOT:PSS
from a benzoid to a quinoid structure. The UV-visible absorption spectrum indicates the creation of free
charges. The increase in the refractive index with doping suggests the formation of localized energy
states within the energy bandgap. These localized states act as recombination centers and increase the
low energy electronic transitions. The dielectric constant was also found increased in the modified
samples, exhibiting advantages for the formation of conducting thin films. A phase segregated
morphology was obtained for the solvent treated PEDOT:PSS, and the MWCNTs were observed to be
uniformly distributed throughout the polymer. Furthermore, the optical conductivity has been calculated
to give comprehensive information about material properties and their systematic selection for desired
applications. |
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