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Hexagonal Transition‐Metal Chalcogenide Nanoflakes with Pronounced Lateral Quantum Confinement
Author(s) -
Miró Pere,
Han Jae Hyo,
Cheon Jinwoo,
Heine Thomas
Publication year - 2014
Publication title -
angewandte chemie international edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 1433-7851
DOI - 10.1002/anie.201404704
Subject(s) - chalcogenide , materials science , crystallography , transition metal , metal , octahedron , electronic structure , quantum dot , stoichiometry , monolayer , chalcogen , nanotechnology , condensed matter physics , chemical physics , chemistry , crystal structure , physics , metallurgy , biochemistry , catalysis
Transition‐metal chalcogenide (TMC) nanoflakes of composition MX 2 (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 M n X 2 n −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.