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Highly thermal-stable paramagnetism by rolling up MoS2 nanosheets
Da Young Hwang1, Kyoung Hwan Choi1, Jeong Eon Park1
1Division of Chemical Engineering, College of Engineering, Hanyang University, Seoul, 04763, Republic of Korea. dhsuh@hanyang.ac.kr.
Nanoscale
|December 13, 2016
Summary
Strain engineering of molybdenum disulfide (MoS2) scrolls enables tunable semiconducting to metallic phase transitions. This irreversible process enhances thermal stability and modifies electronic and magnetic properties for novel low-dimensional materials.
Area of Science:
- Materials Science
- Condensed Matter Physics
- Nanotechnology
Background:
- Controlling material properties at the nanoscale is crucial for technological advancements.
- Phase transitions in two-dimensional (2D) materials offer pathways to tune electronic and magnetic characteristics.
Purpose of the Study:
- To demonstrate a tunable semiconducting to metallic phase transition in molybdenum disulfide (MoS2) using strain engineering.
- To investigate the production of MoS2 nanoscrolls with a high concentration of the 1T phase and assess their thermal stability.
Main Methods:
- Fabrication of MoS2 nanoscrolls via a gliding-rolling process applied to the S plane.
- Characterization of the phase composition and thermal stability of the MoS2 scrolls.
- Analysis of the influence of the 1T phase concentration on bandgap and magnetic properties.
Main Results:
- Successful creation of MoS2 nanoscrolls with up to ~58% 1T phase concentration.
- Demonstrated high thermal stability of the MoS2 scrolls up to 473 K.
- Achieved irreversible phase transitions due to strong van der Waals interactions within the nanoscrolls.
- Tuned the bandgap and magnetic properties (nonmagnetic to paramagnetic) by controlling the 1T phase concentration and temperature.
Conclusions:
- Strain engineering of MoS2 scrolls provides an effective method for controlling phase transitions.
- The developed method allows for tailoring the electronic and magnetic properties of 2D materials.
- This approach opens avenues for designing novel functional low-dimensional materials with desired properties.
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