Unraveling thickness-dependent structural properties of CrSBr nanoflakes using hyperspectral TERS imaging

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F60461373%3A22310%2F25%3A43933135" target="_blank" >RIV/60461373:22310/25:43933135 - isvavai.cz</a>
Result on the web
<a href="https://www.sciencedirect.com/science/article/pii/S0030401825008776" target="_blank" >https://www.sciencedirect.com/science/article/pii/S0030401825008776</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1016/j.optcom.2025.132349" target="_blank" >10.1016/j.optcom.2025.132349</a>

Result language
angličtina
Original language name
Unraveling thickness-dependent structural properties of CrSBr nanoflakes using hyperspectral TERS imaging
Original language description
CrSBr, a layered van der Waals material with intrinsic air stability and layer-dependent magnetic and electronic properties, has emerged as a promising 2D semiconductor. However, nanoscale insight into its thicknessdependent structural and electronic behavior remains limited. In this study, we employ hyperspectral tipenhanced Raman spectroscopy (TERS) imaging to investigate the vibrational and electronic properties of exfoliated CrSBr nanoflakes. Both confocal Raman and TERS measurements reveal a systematic enhancement of the A2g Raman mode relative to the A3g mode in thinner flakes. The I (A2g)/I (A3g) intensity ratio decreases consistently with increasing flake thickness, reflecting underlying changes in the electronic band structure. Hyperspectral TERS mapping confirms this trend at the single-flake level and suggests a resonance Raman enhancement influenced by electron-phonon coupling near the band edge. Our results establish the I (A2g)/I (A3g) ratio as a sensitive spectroscopic marker for thickness-dependent band structure evolution in CrSBr. More broadly, this work highlights hyperspectral TERS as a powerful tool for probing local structure-property relationships in emerging low-dimensional materials.
Czech name
—
Czech description
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Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
10300 - Physical sciences

Project
<a href="/en/project/GM23-08083M" target="_blank" >GM23-08083M: Synthesis and Property Tuning of Layered Low-Dimensional Materials Beyond Graphene – Utilization in Fundamental Research of Heterogeneous Catalysts</a><br>
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year
2025
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

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