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Strong Anisotropic Optical Properties by Rolling up MoS2 Nanoflake
Runqiu Wang1, Shuai Guo1, Zhonglin Li1
1School of Science, Department of Optoelectronic Science, Harbin Institute of Technology at Weihai, Weihai 264209, PR China.
The Journal of Physical Chemistry Letters
|September 1, 2022
Summary
Molybdenum disulfide (MoS2) nanoscrolls exhibit strong anisotropic optical properties. This discovery highlights their potential for advanced multifunctional devices.
Area of Science:
- Materials Science
- Nanotechnology
- Condensed Matter Physics
Background:
- Anisotropic two-dimensional materials are of significant scientific interest.
- Existing materials have anisotropy limited to specific crystallographic directions.
Purpose of the Study:
- To fabricate MoS2 nanoscrolls with dimension confinement.
- To investigate the anisotropic vibrational and optical properties of MoS2 nanoscrolls.
Main Methods:
- Fabrication of MoS2 nanoscrolls via a rolling-up process.
- Angle-resolved polarized spectroscopy (Raman, photoluminescence, reflection).
- Time-resolved photoluminescence measurements.
Main Results:
- MoS2 nanoscrolls were successfully fabricated from MoS2 monolayers.
- Anisotropic vibrational and optical properties were systematically studied.
- Observed PL quenching and decreased carrier lifetime (303 ps) in nanoscrolls compared to nanosheets, indicating efficient carrier separation and transfer.
Conclusions:
- MoS2 nanoscrolls exhibit strong anisotropic optical properties.
- The efficient carrier separation and transfer in nanoscrolls make them promising for multifunctional devices.
