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

Yoshimichi Ohki*, Norikazu Fuse, Tomoyuki Arai

*この研究の対応する著者

研究成果

17 被引用数 (Scopus)

抄録

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.

本文言語English
ホスト出版物のタイトル2010 Annual Report Conference on Electrical Insulation and Dielectric Phenomena, CEIDP 2010
DOI
出版ステータスPublished - 2010 12 1
イベント2010 Annual Report Conference on Electrical Insulation and Dielectric Phenomena, CEIDP 2010 - West Lafayette, IN, United States
継続期間: 2010 10 172010 10 20

出版物シリーズ

名前Annual Report - Conference on Electrical Insulation and Dielectric Phenomena, CEIDP
ISSN(印刷版)0084-9162

Conference

Conference2010 Annual Report Conference on Electrical Insulation and Dielectric Phenomena, CEIDP 2010
国/地域United States
CityWest Lafayette, IN
Period10/10/1710/10/20

ASJC Scopus subject areas

  • 電子材料、光学材料、および磁性材料
  • 電子工学および電気工学

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