Mesostructured germanium with cubic pore symmetry

Gerasimos S. Armatas, Mercouri G Kanatzidis

Research output: Contribution to journalArticle

112 Citations (Scopus)

Abstract

Regular mesoporous oxide materials have been widely studied and have a range of potential applications, such as catalysis, absorption and separation. They are not generally considered for their optical and electronic properties. Elemental semiconductors with nanopores running through them represent a different form of framework material with physical characteristics contrasting with those of the more conventional bulk, thin film and nanocrystalline forms. Here we describe cubic mesostructured germanium, MSU-Ge-1, with gyroidal channels containing surfactant molecules, separated by amorphous walls that lie on the gyroid (G) minimal surface as in the mesoporous silica MCM-48 (ref. 2). Although Ge is a high-melting, covalent semiconductor that is difficult to prepare from solution polymerization, we succeeded in assembling a continuous Ge network using a suitable precursor for Ge4- atoms. Our results indicate that elemental semiconductors from group 14 of the periodic table can be made to adopt mesostructured forms such as MSU-Ge-1, which features two three-dimensional labyrinthine tunnels obeying Ia3̄d space group symmetry and separated by a continuous germanium minimal surface that is otherwise amorphous. A consequence of this new structure for germanium, which has walls only one nanometre thick, is a wider electronic energy bandgap (1.4 eV versus 0.66 eV) than has crystalline or amorphous Ge. Controlled oxidation of MSU-Ge-1 creates a range of germanium suboxides with continuously varying Ge:O ratio and a smoothly increasing energy gap.

Original languageEnglish
Pages (from-to)1122-1125
Number of pages4
JournalNature
Volume441
Issue number7097
DOIs
Publication statusPublished - Jun 29 2006

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Germanium
Semiconductors
Nanopores
Catalysis
Surface-Active Agents
Polymerization
Silicon Dioxide
Oxides
Freezing

ASJC Scopus subject areas

  • General

Cite this

Mesostructured germanium with cubic pore symmetry. / Armatas, Gerasimos S.; Kanatzidis, Mercouri G.

In: Nature, Vol. 441, No. 7097, 29.06.2006, p. 1122-1125.

Research output: Contribution to journalArticle

Armatas, Gerasimos S. ; Kanatzidis, Mercouri G. / Mesostructured germanium with cubic pore symmetry. In: Nature. 2006 ; Vol. 441, No. 7097. pp. 1122-1125.
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