Nano Archive

Metallic state in a lime-alumina compound with nanoporous structure

Kim, Sung Wng and Matsuishi, Satoru and Nomura, Takatoshi and Kubota, Yoshiki and Takata, Masaki and Hayashi, Katsuro and Kamiya, Toshio and Hirano, Masahiro and Hosono, Hideo (2007) Metallic state in a lime-alumina compound with nanoporous structure. NANO LETTERS, 7 (5). pp. 1138-1143.

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Official URL: http://pubs.acs.org/doi/abs/10.1021/nl062717b

Abstract

We report a metallic state in a nanostructured porous crystal 12CaO center dot 7Al(2)O(3) 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 (similar to 2 x 10(21) cm(-3)), which was achieved by a thermal treatment in Ti metal vapor at similar to 1100 degrees 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 similar to 0.1 to 4 cm(2) 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.

Item Type:Article
Uncontrolled Keywords:CRYSTAL 12CAO-CENTER-DOT-7AL(2)O(3); ELECTRONIC CONDUCTOR; INORGANIC ELECTRIDE; CA12AL14O33; DENSITY; ANIONS; OXYGEN; OXIDE; IONS
Subjects:Material Science > Nanostructured materials
ID Code:6173
Deposited By:IoN
Deposited On:11 Sep 2009 12:03
Last Modified:11 Sep 2009 12:03

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