Journal
NANOSCALE
Volume 7, Issue 2, Pages 650-658Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c4nr06141a
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Funding
- National Basic Research Program of China [2012CB933101]
- National Natural Science Foundation of China [51371093, 11034004, 11474137]
- Program for Changjiang Scholars and Innovative Research Team in University [IRT1251]
- Specialized Research Fund for the Doctoral Program of Higher Education [20130211130003]
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High Curie temperature ferromagnetism has been realized in atomically thin MoS2 and WS2 nanosheets. The ultrathin nanosheet samples were prepared via a novel, simple and efficient chemical vapor deposition method; different kinds of transition metal disulfides (MoS2 and WS2) could be obtained by sulphuring the corresponding cation sources (MoO3 and WCl6). Through related morphological and structural characterization, we confirm that large-area, uniform, few-layer MoS2 and WS2 nanosheets were successfully synthesized by this method. Both nanosheet samples exhibit distinct ferromagnetic behavior. By careful measurement and fitting of the magnetization of MoS2 and WS2 samples at different temperatures, we deconstruct the magnetization into its diamagnetic, paramagnetic and ferromagnetic contributions. The ferromagnetic contributions persist until 865 K for MoS2 and 820 K for WS2. We attribute the observed ferromagnetic properties to the defects and dislocations produced during the growth process, as well as the presence of edge spins at the edge of the nanosheets.
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