7Li NMR study of Li-doped polyacenic semiconductor (PAS) materials

Hiroki Ago, Kazuyoshi Tanaka, Tokio Yamabe, Kiyonori Takegoshi, Takehiko Terao, Shizukuni Yata, Yukinori Hato, Nobuo Ando

Research output: Contribution to journalArticle

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Abstract

The polyacenic semiconductor (PAS) material prepared from phenol resin at relatively low temperature (680 °C) can be doped by a much larger amount of lithium atoms up to the C2Li state compared with graphite (C6Li state). To understand the Li storage mechanism as well as the electronic structure, 7Li nuclear magnetic resonance (NMR) measurements have been performed for the Li-doped PAS materials. In the initial doping stage a broad signal was observed at 0 ppm, while the successive doping causes a Knight shift to 9 ppm. It is suggested from this Knight shift that the Li nucleus slightly undergoes the Fermi contact interaction with conduction electrons delocalizing through carbon π-atomic Orbitals. From the spin-lattice relaxation rate (1/T1), it is found that the Li nucleus in the PAS material loses its mobility by the surrounding Li nuclei with the proceeding doping and that the Li nucleus is more loosely trapped than that in the C6Li state of graphite.

Original languageEnglish
Pages (from-to)141-147
Number of pages7
JournalSynthetic Metals
Volume89
Issue number2
Publication statusPublished - Aug 1997

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Aromatic polymers
Graphite
Doping (additives)
Nuclear magnetic resonance
Semiconductor materials
nuclear magnetic resonance
nuclei
Magnetic resonance measurement
Spin-lattice relaxation
graphite
Phenol
Lithium
Phenols
Electronic structure
Carbon
Resins
spin-lattice relaxation
conduction electrons
phenols
resins

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

Cite this

Ago, H., Tanaka, K., Yamabe, T., Takegoshi, K., Terao, T., Yata, S., ... Ando, N. (1997). 7Li NMR study of Li-doped polyacenic semiconductor (PAS) materials. Synthetic Metals, 89(2), 141-147.

7Li NMR study of Li-doped polyacenic semiconductor (PAS) materials. / Ago, Hiroki; Tanaka, Kazuyoshi; Yamabe, Tokio; Takegoshi, Kiyonori; Terao, Takehiko; Yata, Shizukuni; Hato, Yukinori; Ando, Nobuo.

In: Synthetic Metals, Vol. 89, No. 2, 08.1997, p. 141-147.

Research output: Contribution to journalArticle

Ago, H, Tanaka, K, Yamabe, T, Takegoshi, K, Terao, T, Yata, S, Hato, Y & Ando, N 1997, '7Li NMR study of Li-doped polyacenic semiconductor (PAS) materials', Synthetic Metals, vol. 89, no. 2, pp. 141-147.
Ago H, Tanaka K, Yamabe T, Takegoshi K, Terao T, Yata S et al. 7Li NMR study of Li-doped polyacenic semiconductor (PAS) materials. Synthetic Metals. 1997 Aug;89(2):141-147.
Ago, Hiroki ; Tanaka, Kazuyoshi ; Yamabe, Tokio ; Takegoshi, Kiyonori ; Terao, Takehiko ; Yata, Shizukuni ; Hato, Yukinori ; Ando, Nobuo. / 7Li NMR study of Li-doped polyacenic semiconductor (PAS) materials. In: Synthetic Metals. 1997 ; Vol. 89, No. 2. pp. 141-147.
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