Controlled growth of MoS2 via surface-energy alterations
Wen Wan1, Linjie Zhan1, Tien-Mo Shih1,2
1Collaborative Innovation Center for Optoelectronic Semiconductors and Efficient Devices, Department of Physics, Xiamen University, Xiamen, Fujian 361005, People's Republic of China.
Nanotechnology
|October 2, 2019
Summary
Researchers selectively synthesized two types of molybdenum disulfide (MoS2) monolayers on different substrates. This controlled synthesis advances applications in catalysis and flexible electronics.
Area of Science:
- Materials Science
- Surface Chemistry
- Nanotechnology
Background:
- Molybdenum disulfide (MoS2) monolayers exhibit distinct properties based on their morphology, such as catalytically active edges or uniform films.
- These properties are crucial for applications in hydrogen evolution reactions and flexible electronic/optoelectronic devices.
Purpose of the Study:
- To experimentally achieve selective synthesis of different MoS2 monolayer morphologies.
- To understand the substrate-dependent growth mechanisms of MoS2 monolayers.
Main Methods:
- Controlled on-surface synthesis of MoS2 monolayers on graphene and sapphire substrates.
- Analysis of precursor adsorption energy and diffusion barriers.
Main Results:
- Selective synthesis of triangular MoS2 with rich edges or uniform MoS2 films was achieved on different substrates.
- Growth mechanisms were correlated with substrate-specific adsorption energy and diffusion barriers of vapor precursors.
Conclusions:
- The study provides fundamental insights into the on-surface synthesis of high-quality MoS2 monolayers.
- The findings enable the growth of advanced MoS2-based heterostructures, including vertically-stacked and in-plane lateral configurations with graphene.
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