期刊
CHEMISTRY OF MATERIALS
卷 29, 期 2, 页码 699-707出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.chemmater.6b04363
关键词
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资金
- Academia Sinica research program on Nanoscience and Nanotechnology [NM004]
- Ministry of Science and Technology in Taiwan [MOST-102-2119-M-002-004]
Large size (similar to 2 cm) single crystals of layered MoTe2 in both 2H- and 1T'-types were synthsized using TeBr4 as the source of Br-2 transport agent in chemical vapor transport growth. The crystal structures of the as-grown single crystals were fully characterized by X-ray diffraction, Raman spectroscopy, scanning transmission electron microscopy, scanning tunneling microscopy (STM), and electrical resistivity (rho) measurements. The resistivity rho(T), magnetic susceptibility chi(T), and heat capacity C-p(T) measurement results reveal a first order structural phase transition near similar to 240 K for 1T'-MoTe2, which has been identified to be the orthorhombic Td-phase of MoTe2 as a candidate of Weyl semimetal. The STM study revealed different local defect geometries found on the surface of 2H- and Td-types of MoTe6 units in trigonal prismatic and distorted octahedral coordination, respectively.
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