Additive-enhanced exfoliation for high-yield 2d materials production
Journal
Nanomaterials
Journal Volume
11
Journal Issue
3
Pages
1-8
Date Issued
2021
Author(s)
Nguyen D.-T., Ting H.-A., Su Y.-H., Hofmann M., Hsieh Y.-P.
Abstract
The success of van-der-Waals electronics, which combine large-scale-deposition capabilities with high device performance, relies on the efficient production of suitable 2D materials. Shear exfoliation of 2D materials’ flakes from bulk sources can generate 2D materials with low amounts of defects, but the production yield has been limited below industry requirements. Here, we introduce additive-assisted exfoliation (AAE) as an approach to significantly increase the efficiency of shear exfoliation and produce an exfoliation yield of 30%. By introducing micrometer-sized particles that do not exfoliate, the gap between rotor and stator was dynamically reduced to increase the achievable shear rate. This enhancement was applied to WS2 and MoS2 production, which represent two of the most promising 2D transition-metal dichalcogenides. Spectroscopic characterization and cascade centrifugation reveal a consistent and significant increase in 2D material concentrations across all thickness ranges. Thus, the produced WS2 films exhibit high thickness uniformity in the nanometer-scale and can open up new routes for 2D materials production towards future applications. ? 2021 by the authors. Licensee MDPI, Basel, Switzerland.
Type
journal article