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자연과학대학
물리학전공
Journal papers
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Unveiling the distinctive mechanical and thermal properties of γ-GeSe
Title
Unveiling the distinctive mechanical and thermal properties of γ-GeSe
Authors
Park
;
Jinsub
;
Je
;
Yugyeong
;
Kim
;
Joonho
;
Je Myoung
;
Jung
;
Joong-Eon
;
Cheong
;
Hyeonsik
;
Lee
;
Sang Wook
;
Kwanpyo
Ewha Authors
이상욱
SCOPUS Author ID
이상욱
Issue Date
2024
Journal Title
Nano Convergence
ISSN
2196-5404
Citation
Nano Convergence vol. 11, no. 1
Keywords
Freestanding structure
;
Group-IV Monochalcogenide
;
Thermal conductivity
;
Young’s modulus
;
γ-GeSe
Indexed
SCIE; SCOPUS; KCI
Document Type
Article
Abstract
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.
DOI
10.1186/s40580-024-00436-3
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