Band gap energies and localized states in several insulating polymers estimated by optical measurements

Yoshimichi Ohki, Norikazu Fuse, Tomoyuki Arai

    Research output: Chapter in Book/Report/Conference proceedingConference contribution

    10 Citations (Scopus)

    Abstract

    The band gap energy was estimated experimentally by measuring the change in optical absorption intensity as a function of photon energy in a wide range from visible to vacuum-ultraviolet wavelengths for commercially available 11 kinds of insulating polymers. The absorption spectra as a function of photon energy measured by synchrotron radiation and by a spectrometer agree with each other at the photon energies where the two measurements were available. The band gap energy is quite high in linear polyolefin polymers. Namely, it is 6.9 and 7.0 eV for polyethylene and polypropylene, respectively. In these two polymers, the relative permittivity at 1 kHz is quite low in both polymers. On the other hand, the polymers with aromatic rings in their structures have low band gap energies and large permittivities. Namely, a negative relationship between the band gap energy and permittivity, which is well known for inorganic solids, is also seen in insulating polymers. Furthermore, to investigate the possibility of appearance of midgap localized states by the addition of nanofillers, absorption and luminescence spectra were examined for polymer nanocomposites based on polyethylene and polyamide. As a result, the nanofiller addition was found to give no influences on their band gaps.

    Original languageEnglish
    Title of host publicationAnnual Report - Conference on Electrical Insulation and Dielectric Phenomena, CEIDP
    DOIs
    Publication statusPublished - 2010
    Event2010 Annual Report Conference on Electrical Insulation and Dielectric Phenomena, CEIDP 2010 - West Lafayette, IN
    Duration: 2010 Oct 172010 Oct 20

    Other

    Other2010 Annual Report Conference on Electrical Insulation and Dielectric Phenomena, CEIDP 2010
    CityWest Lafayette, IN
    Period10/10/1710/10/20

    Fingerprint

    Polymers
    Energy gap
    Permittivity
    Photons
    Polyethylene
    Polyethylenes
    Polypropylenes
    Nylons
    Polyolefins
    Synchrotron radiation
    Polyamides
    Light absorption
    Spectrometers
    Luminescence
    Absorption spectra
    Nanocomposites
    Vacuum
    Wavelength

    ASJC Scopus subject areas

    • Electronic, Optical and Magnetic Materials
    • Electrical and Electronic Engineering

    Cite this

    Ohki, Y., Fuse, N., & Arai, T. (2010). Band gap energies and localized states in several insulating polymers estimated by optical measurements. In Annual Report - Conference on Electrical Insulation and Dielectric Phenomena, CEIDP [5723991] https://doi.org/10.1109/CEIDP.2010.5723991

    Band gap energies and localized states in several insulating polymers estimated by optical measurements. / Ohki, Yoshimichi; Fuse, Norikazu; Arai, Tomoyuki.

    Annual Report - Conference on Electrical Insulation and Dielectric Phenomena, CEIDP. 2010. 5723991.

    Research output: Chapter in Book/Report/Conference proceedingConference contribution

    Ohki, Y, Fuse, N & Arai, T 2010, Band gap energies and localized states in several insulating polymers estimated by optical measurements. in Annual Report - Conference on Electrical Insulation and Dielectric Phenomena, CEIDP., 5723991, 2010 Annual Report Conference on Electrical Insulation and Dielectric Phenomena, CEIDP 2010, West Lafayette, IN, 10/10/17. https://doi.org/10.1109/CEIDP.2010.5723991
    Ohki Y, Fuse N, Arai T. Band gap energies and localized states in several insulating polymers estimated by optical measurements. In Annual Report - Conference on Electrical Insulation and Dielectric Phenomena, CEIDP. 2010. 5723991 https://doi.org/10.1109/CEIDP.2010.5723991
    Ohki, Yoshimichi ; Fuse, Norikazu ; Arai, Tomoyuki. / Band gap energies and localized states in several insulating polymers estimated by optical measurements. Annual Report - Conference on Electrical Insulation and Dielectric Phenomena, CEIDP. 2010.
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