Synthesis of Semiconducting 2H-Phase WTe2 Nanosheets with Large Positive Magnetoresistance
Autor: | Shuang Li, Junfeng Xie, Ruo-Qi Wang, Xu Peng, Fengcai Lei, Ya-Pan Wu, Dong-Sheng Li |
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Rok vydání: | 2020 |
Předmět: |
Phase transition
Magnetoresistance Condensed matter physics 010405 organic chemistry Chemistry business.industry 010402 general chemistry 01 natural sciences Exfoliation joint 0104 chemical sciences Inorganic Chemistry symbols.namesake Semiconductor Phase (matter) Density of states symbols Orthorhombic crystal system Physical and Theoretical Chemistry business Raman spectroscopy |
Zdroj: | Inorganic Chemistry. 59:11935-11939 |
ISSN: | 1520-510X 0020-1669 |
Popis: | Tungsten ditelluride (WTe2) is provoking immense interest because of its unique electronic properties, but studies about its semiconducting hexagonal (2H) phase are quite rare. Herein, we report the synthesis of semiconducting 2H WTe2 nanosheets with large positive magnetoresistance, for the first time, by a simple lithium-intercalation-assisted exfoliation strategy. Systematic characterizations including high-resolution transmission electron microscopy, X-ray diffraction, and Raman and X-ray photoelectron spectroscopies provide clear evidence to distinguish the structure of 2H WTe2 nanosheets from the orthorhombic (Td) phase bulk counterpart. The corresponding electronic phase transition from metal to semiconductor is also confirmed by density of states calculation, optical absorption, and electrical transport property measurements. Besides, the 2H WTe2 nanosheets exhibit large positive magnetoresistance with values of up to 29.5% (10 K) and 16.2% (300 K) at 9 T. Overall, these findings open up a promising avenue into the exploration of WTe2-based materials in the semiconductor field. |
Databáze: | OpenAIRE |
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