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Ultrathin Non‐van der Waals Magnetic Rhombohedral Cr 2 S 3 : Space‐Confined Chemical Vapor Deposition Synthesis and Raman Scattering Investigation
Author(s) -
Zhou Shasha,
Wang Renyan,
Han Junbo,
Wang Deli,
Li Huiqiao,
Gan Lin,
Zhai Tianyou
Publication year - 2019
Publication title -
advanced functional materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 6.069
H-Index - 322
eISSN - 1616-3028
pISSN - 1616-301X
DOI - 10.1002/adfm.201805880
Subject(s) - van der waals force , raman spectroscopy , materials science , raman scattering , antiferromagnetism , chemical vapor deposition , condensed matter physics , chalcogenide , nanotechnology , crystallography , chemical physics , optics , chemistry , physics , optoelectronics , molecule , organic chemistry
Two dimensional (2D) magnetic materials display enormous application potential in spintronic fields. However, most of currently reported magnetic materials are van der Waals layered structure that is easy to be isolated via exfoliation method. By contrast, the studies on non‐van der Waals ultrathin magnetic materials are rare, largely due to the difficulty in fabrication. Rhombohedral Cr 2 S 3 , an intensively studied antiferromagnetic transition metal chalcogenide with Neel temperature of ≈120 K, has a typical non‐van der Waals structure. Restricted by the strong covalent bonding in all the three dimensions of non‐van der Waals structure, the synthesis of ultrathin Cr 2 S 3 single crystals is still a challenge that is not achieved yet. Besides, the study on the Raman modes of rhombohedral Cr 2 S 3 is also absent. Herein, by employing space‐confined chemical vapor deposition strategy, ultrathin rhombohedral Cr 2 S 3 single crystals with a thickness down to ≈2.5 nm for the first time are successfully grown. Moreover, a systematically investigation is also conducted on the Raman vibrations of ultrathin rhombohedral Cr 2 S 3 . With the aid of angle‐resolved polarized Raman technique, the Raman modes of rhombohedral Cr 2 S 3 for the first time based on crystal symmetry and Raman selection rules are rationally assigned.