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Chemical Vapor Deposition of 2D Vanadium Disulfide and Diselenide and Raman Characterization of the Phase Transitions
Author(s) -
Hossain Mongur,
Wu Juanxia,
Wen Wen,
Liu Haining,
Wang Xinsheng,
Xie Liming
Publication year - 2018
Publication title -
advanced materials interfaces
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.671
H-Index - 65
ISSN - 2196-7350
DOI - 10.1002/admi.201800528
Subject(s) - materials science , raman spectroscopy , chemical vapor deposition , vanadium , characterization (materials science) , diselenide , nanomaterials , analytical chemistry (journal) , phase (matter) , phase transition , nanotechnology , chemical engineering , selenium , condensed matter physics , metallurgy , optics , chemistry , physics , organic chemistry , engineering , chromatography
2D metallic vanadium dichalcogenides (VX 2 ) have renewed interest due to their unique physical properties and potential applications as high‐performance functional nanomaterials. Herein, the synthesis and phase transitions of 2D metallic VX 2 are investigated. The synthesis is done by chemical vapor deposition using hexagonal boron nitride and mica as substrates. High‐quality VX 2 flakes with sub‐10 nm thickness are obtained and characterized by transmission electron microscopy. Temperature‐dependent Raman characterization between 330 and 5 K is conducted and remarkable changes of Raman modes at around 150 K for VS 2 flakes and 110 K for VSe 2 flakes are revealed, indicating charge density wave phase transitions. Temperature‐dependent electrical measurements have also supported the phase transitions observed in Raman characterization.