Adhesion-induced MoS2 layer transfer via in-situ TEM-nanoindentation - Effects of curvature and substrate mediated residual stress
At a Glance
Section titled āAt a Glanceā| Metadata | Details |
|---|---|
| Publication Date | 2024-12-31 |
| Journal | Applied Surface Science Advances |
| Authors | Jhih H. Liang, M. Djafari Rouhani, J. David Schall, Takaaki Sato, Christopher Muratore |
| Citations | 1 |
Abstract
Section titled āAbstractāMolybdenum disulfide (MoS2) holds great potential in a wide range of applications, including electronics, photodetectors, light-emitting diodes (LEDs), and solar cells due to its unique two-dimensional (2D) structure. This structure enables innovative functionalities, particularly in flexible and wearable technologies. However, a significant knowledge gap remains regarding MoS2ās interfacial adhesion, a critical aspect for advancing next-generation devices. To address this, we conducted a comprehensive study investigating the interaction forces originating from the bonding between atoms that govern the adhesion of ultra-thin 2D MoS2. Our pioneering in situ experiments, utilizing TEM-based nanoindentation, provided precise imaging and force monitoring of MoS2ās interaction with a diamond. We employed four MoS2-coated AFM tips with varying radii and preparation methods, with films prepared on two Si wafers subjected to different oxidation protocols. Our findings, validated by Raman and X-ray photoelectron spectroscopy, reveal unique insights into MoS2ās interfacial behavior. We observed a decreased structural order in MoS2 on sharper tips, particularly those without pre-deposition oxidation. These results underscore the importance of residual stress between the MoS2 film and substrate and the influence of curvature-induced residual stress in fostering less-ordered MoS2 structures with heightened work of adhesion. Importantly, this is the first study to report the work of adhesion for MoS2-diamond contact. Our findings highlight the crucial role of covalent bonding at contact points in the material transfer processes involving 2D materials. This is a critical insight for developing precise and reliable methods for manipulating 2D materials, which could significantly advance our understanding and application of materials science, particularly in nanotechnology and device fabrication.
Tech Support
Section titled āTech SupportāOriginal Source
Section titled āOriginal SourceāReferences
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