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Phase‐Selective Synthesis of Ultrathin FeTe Nanoplates by Controllable Fe/Te Atom Ratio in the Growth Atmosphere
Author(s) -
Zhang Hongmei,
Li Qiuqiu,
Hossain Mongur,
Li Bo,
Chen Keqiu,
Huang Ziwei,
Yang Xiangdong,
Dang Weiqi,
Shu Weining,
Wang Di,
Li Bailing,
Xu Weiting,
Zhang Zucheng,
Yu Gang,
Duan Xidong
Publication year - 2021
Publication title -
small
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.785
H-Index - 236
eISSN - 1613-6829
pISSN - 1613-6810
DOI - 10.1002/smll.202101616
Subject(s) - materials science , tetragonal crystal system , phase (matter) , nanotechnology , hexagonal phase , transmission electron microscopy , crystallinity , scanning electron microscope , selected area diffraction , high resolution transmission electron microscopy , optoelectronics , chemical engineering , composite material , chemistry , organic chemistry , engineering
Phase controllable synthesis of 2D materials is of significance for tuning related electrical, optical, and magnetic properties. Herein, the phase‐controllable synthesis of tetragonal and hexagonal FeTe nanoplates has been realized by a rational control of the Fe/Te ratio in a chemical vapor deposition system. Using density functional theory calculations, it has been revealed that with the change of the Fe/Te ratio, the formation energy of active clusters changes, causing the phase‐controllable synthesis of FeTe nanoplates. The thickness of the obtained FeTe nanoplates can be tuned down to the 2D limit (2.8 nm for tetragonal and 1.4 nm for hexagonal FeTe). X‐ray diffraction pattern, transmission electron microscopy, and high resolution scanning transmission electron microscope analyses exhibit the high crystallinity of the as‐grown FeTe nanoplates. The two kinds of FeTe nanoflakes show metallic behavior and good electrical conductivity, featuring 8.44 × 10 4 S m −1 for 9.8 nm‐thick tetragonal FeTe and 5.45 × 10 4 S m −1 for 7.6 nm‐thick hexagonal FeTe. The study provides an efficient and convenient route for tailoring the phases of FeTe nanoplates, which benefits to study phase‐sensitive properties, and may pave the way for the synthesis of other multiphase 2D nanosheets with controllable phases.