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

doi:10.1021/nl062717b

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 journal › Article › peer-review

191 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 language	English
Pages (from-to)	1138-1143
Number of pages	6
Journal	Nano Letters
Volume	7
Issue number	5
DOIs	https://doi.org/10.1021/nl062717b
Publication status	Published - May 1 2007
Externally published	Yes

All Science Journal Classification (ASJC) codes

Bioengineering
Chemistry(all)
Materials Science(all)
Condensed Matter Physics
Mechanical Engineering

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10.1021/nl062717b

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title = "Metallic state in a lime-alumina compound with nanoporous structure",

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.",

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AU - Kim, Sung Wng

AU - Matsuishi, Satoru

AU - Nomura, Takatoshi

AU - Kubota, Yoshiki

AU - Takata, Masaki

AU - Hayashi, Katsuro

AU - Kamiya, Toshio

AU - Hirano, Masahiro

AU - Hosono, Hideo

PY - 2007/5/1

Y1 - 2007/5/1

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AB - 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.

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Metallic state in a lime-alumina compound with nanoporous structure

Abstract

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