Metallic state in a lime-alumina compound with nanoporous structure

Sung Wng Kim, Satoru Matsuishi, Takatoshi Nomura, Yoshiki Kubota, Masaki Takata, Katsuro Hayashi, Toshio Kamiya, Masahiro Hirano, Hideo Hosono

Research output: Contribution to journalArticle

168 Citations (Scopus)

Abstract

We report a metallic state in a nanostructured porous crystal 12CaO-7Al2O3 by incorporating electrons in the inherent subnanometer-sized cages, in which a three-dimensionally closely packed cage structure acts as an electronic conduction path. High-density electron doping (∼2 x 1021 cm-3), which was achieved by a thermal treatment in Ti metal vapor at ∼1100 °C, induces homogenization of the cage geometry to a symmetric state, resulting in an insulator-metal transition with a sharp enhancement of the electron drift mobility from ∼0.1 to 4 cm2 V-1 s-1. The results provide an approach for the realization of electroactive functions in materials composed only of environmentally benign elements by utilizing the appropriate nanostructures.

Original languageEnglish
Pages (from-to)1138-1143
Number of pages6
JournalNano Letters
Volume7
Issue number5
DOIs
Publication statusPublished - 2007 May 1
Externally publishedYes

ASJC Scopus subject areas

  • Materials Science(all)
  • Electronic, Optical and Magnetic Materials
  • Chemistry (miscellaneous)

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    Kim, S. W., Matsuishi, S., Nomura, T., Kubota, Y., Takata, M., Hayashi, K., Kamiya, T., Hirano, M., & Hosono, H. (2007). Metallic state in a lime-alumina compound with nanoporous structure. Nano Letters, 7(5), 1138-1143. https://doi.org/10.1021/nl062717b