Hexagonal transition-metal chalcogenide nanoflakes with pronounced lateral quantum confinement

Pere Miró, Jae Hyo Han, Jinwoo Cheon, Thomas Heine

Research output: Contribution to journalArticle

14 Citations (Scopus)

Abstract

Transition-metal chalcogenide (TMC) nanoflakes of composition MX2 (where M = Ti, Zr and Hf; X = S and Se) crystallize preferentially in equilateral hexagons and exhibit a pronounced lateral quantum confinement. The hexagonal shape of octahedral (1T) TMC nanoflakes is the result of charge localization at the edges/vertices and the resulting Coulomb repulsion. Independent of their size, all nanoflakes have the MnX2n-2 stoichiometry and thus an unoxidized metal center which results in dopant states. These states become relevant for small nanoflakes and lead to metallic character, but for larger nanoflakes (> 6 nm) the 2D monolayer properties dominate. Finally, coordination of Lewis bases at the nanoflake edges has no significant effect on the electronic structure of these species confirming the viability of colloidal synthetic approaches.

Original languageEnglish
Pages (from-to)12624-12628
Number of pages5
JournalAngewandte Chemie - International Edition
Volume53
Issue number46
DOIs
Publication statusPublished - 2014 Nov 10

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Quantum confinement
Transition metals
Lewis Bases
Stoichiometry
Electronic structure
Monolayers
Metals
Doping (additives)
Chemical analysis

All Science Journal Classification (ASJC) codes

  • Catalysis
  • Chemistry(all)

Cite this

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abstract = "Transition-metal chalcogenide (TMC) nanoflakes of composition MX2 (where M = Ti, Zr and Hf; X = S and Se) crystallize preferentially in equilateral hexagons and exhibit a pronounced lateral quantum confinement. The hexagonal shape of octahedral (1T) TMC nanoflakes is the result of charge localization at the edges/vertices and the resulting Coulomb repulsion. Independent of their size, all nanoflakes have the MnX2n-2 stoichiometry and thus an unoxidized metal center which results in dopant states. These states become relevant for small nanoflakes and lead to metallic character, but for larger nanoflakes (> 6 nm) the 2D monolayer properties dominate. Finally, coordination of Lewis bases at the nanoflake edges has no significant effect on the electronic structure of these species confirming the viability of colloidal synthetic approaches.",
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Hexagonal transition-metal chalcogenide nanoflakes with pronounced lateral quantum confinement. / Miró, Pere; Han, Jae Hyo; Cheon, Jinwoo; Heine, Thomas.

In: Angewandte Chemie - International Edition, Vol. 53, No. 46, 10.11.2014, p. 12624-12628.

Research output: Contribution to journalArticle

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