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Room-temperature ferromagnetism in Co doped MoS2 sheets
ZhongCheng Xiang1, Zhong Zhang, XiJin Xu
1School of Physics and Technology, University of Jinan, Jinan 250022, China. ss_zhangz@ujn.edu.cn.
Physical Chemistry Chemical Physics : PCCP
|May 29, 2015
Summary
This study synthesized cobalt-doped molybdenum disulfide (MoS2) nanosheets. Increasing cobalt concentration enhanced nanosheet quality but decreased magnetic moment, confirmed by DFT computations.
Area of Science:
- Materials Science
- Condensed Matter Physics
- Nanotechnology
Background:
- Molybdenum disulfide (MoS2) is a promising 2D material with diverse applications.
- Doping MoS2 can tune its electronic and magnetic properties.
- Understanding the impact of dopants like cobalt (Co) is crucial for material design.
Purpose of the Study:
- To synthesize and characterize Co-doped MoS2 nanosheets.
- To investigate the effect of varying Co concentrations on structural, optical, and magnetic properties.
- To elucidate the mechanism behind the observed magnetic behavior using theoretical calculations.
Main Methods:
- Hydrothermal synthesis of MoS2 nanosheets with 0%, 3%, and 7% Co doping.
- Characterization using BET surface area analysis and optical absorption spectroscopy.
- Magnetization measurements and Density Functional Theory (DFT) computations.
Main Results:
- Nanosheet thickness and flatness increased with Co doping.
- BET surface area decreased with increasing Co concentration.
- Optical absorption showed exciton red-shifts of 10 meV and 23 meV for 3% and 7% Co doping, respectively.
- Magnetic moment decreased with increasing Co doping, consistent with DFT results.
Conclusions:
- Co doping influences the structural and optical properties of MoS2 nanosheets.
- The observed decrease in magnetic moment with increasing Co concentration is computationally supported.
- This work provides insights into tailoring magnetic properties of 2D materials through doping.
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