Unveiling the distinctive mechanical and thermal properties of γ-GeSe
- 주제(키워드) Freestanding structure , Group-IV Monochalcogenide , Thermal conductivity , Young’s modulus , γ-GeSe
- 후원정보 Korea Nano Technology Research Society
- 등재 SCIE, SCOPUS, KCI등재
- OA유형 Gold Open Access
- 발행년도 2024
- 총서유형 Journal
- URI http://www.dcollection.net/handler/ewha/000000240612
- 본문언어 영어
- Published As https://doi.org/10.1186/s40580-024-00436-3
- PubMed https://pubmed.ncbi.nlm.nih.gov/39009919
초록/요약
γ-GeSe is a newly identified polymorph among group-IV monochalcogenides, characterized by a distinctive interatomic bonding configuration. Despite its promising applications in electrical and thermal domains, the experimental verification of its mechanical and thermal properties remains unreported. Here, we experimentally characterize the in-plane Young’s modulus (E) and thermal conductivity () of γ-GeSe. The mechanical vibrational modes of freestanding γ-GeSe flakes are measured using optical interferometry. Nano-indentation via atomic force microscopy is also conducted to induce mechanical deformation and to extract the E. Comparison with finite-element simulations reveals that the E is 97.37.5 GPa as determined by optical interferometry and 109.413.5 GPa as established through the nano-indentation method. Additionally, optothermal Raman spectroscopy reveals that γ-GeSe has a lattice thermal conductivity of 2.3 0.4 Wm−1K−1 and a total thermal conductivity of 7.5 0.4 Wm−1K−1 in the in-plane direction at room temperature. The notably high ratio in γ-GeSe, compared to other layered materials, underscores its distinctive structural and dynamic characteristics. © The Author(s) 2024.
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