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Updated: Sep 22, 2025
04:57
Residue-Free Fabrication of van der Waals Heterostructures of Two-Dimensional Materials
Published on: July 18, 2025
388
Coupling nanobubbles in 2D lateral heterostructures.
Sharad Ambardar1, Rana Kamh2, Zachary H Withers3
1Department of Medical Engineering, University of South Florida, Tampa, FL 33620, USA. voronine@usf.edu.
Nanoscale
|May 19, 2022
Summary
Researchers developed a new method to create nanobubbles in 2D materials like MoS2 and WS2. This technique enhances light emission through coupled nanobubbles, paving the way for advanced nanophotonic devices.
Area of Science:
- Materials Science
- Nanotechnology
- Optoelectronics
Background:
- Two-dimensional transition metal dichalcogenides (2D TMDs) offer unique optoelectronic properties for nanophotonic applications.
- Strain engineering in 2D TMDs allows for tunable band gaps, with nanobubbles acting as 'artificial atoms' that funnel excitons.
Purpose of the Study:
- To introduce a novel method for fabricating nanobubbles in monolayer 2D lateral heterostructures.
- To investigate the optical coupling and enhancement mechanisms in MoS2 and WS2 nanobubbles.
Main Methods:
- Fabrication of MoS2 and WS2 nanobubbles using high-temperature superacid treatment.
- Tip-enhanced photoluminescence (TEPL) spectroscopy for nanoscale near-field imaging.
- Development of a quantum plasmonic model to explain experimental observations.
Main Results:
- Successful fabrication of MoS2 and WS2 nanobubbles.
- TEPL nanoimaging revealed synergistic photoluminescence enhancement from coupled nanobubbles.
- Identified contributions from plasmonic tip, hot electrons, and exciton funnelling to the observed enhancement.
Conclusions:
- The new superacid treatment method enables precise nanobubble fabrication in 2D lateral heterostructures.
- Coupled MoS2 and WS2 nanobubbles exhibit significant synergistic photoluminescence enhancement.
- The developed quantum plasmonic model accurately describes the experimental findings, offering insights into nanophotonic coupling schemes.
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