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Direct mapping of bending and torsional dynamics in individual nanostructures
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Tong, Ling, Li, Deshuai, Sun, Ting, Gao, Si, Wang, Peng, Tang, Jau, Wang, Zhong Lin, Shi, Kebin and Wang, Zhi Wei (2023) Direct mapping of bending and torsional dynamics in individual nanostructures. Proceedings of the National Academy of Sciences, 120 (25). e2221956120. doi:10.1073/pnas.2221956120 ISSN 0027-8424.
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WRAP-direct-mapping-bending-torsional-dynamics-individual-nanostructures-Wang-2023.pdf - Published Version - Requires a PDF viewer. Available under License Creative Commons Attribution Non-commercial No Derivatives 4.0. Download (1985Kb) | Preview |
Official URL: http://dx.doi.org/10.1073/pnas.2221956120
Abstract
Investigating coherent acoustic vibrations in nanostructured materials provides fundamental insights into optomechanical responses and microscopic energy flow. Extensive measurements of vibrational dynamics have been performed for a wide variety of nanoparticles and nanoparticle assemblies. However, virtually all of them show that only the dilation modes are launched after laser excitations, and the acoustic bending and torsional motions, which are commonly observed in photoexcited chemical bonds, are absent. Unambiguous identification and refined characterization of these “missing” modes have been a long-standing issue. In this report, we investigated the acoustic vibrational dynamics of individual Au nanoprisms on free-standing graphene substrates using an ultrafast high-sensitivity dark-field imaging approach in four-dimensional transmission electron microscopy. Following optical excitations, we observed low-frequency multiple-mode oscillations and higher superposition amplitudes at nanoprism corners and edges on the subnanoparticle level. In combination with finite-element simulations, we determined that these vibrational modes correspond to out-of-plane bending and torsional motions, superimposed by an overall tilting effect of the nanoprisms. The launch and relaxation processes of these modes are highly pertinent to substrate effects and nanoparticle geometries. These findings contribute to the fundamental understanding about acoustic dynamics of individual nanostructures and their interaction with substrates.
Item Type: | Journal Article | ||||||
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Subjects: | Q Science > QC Physics T Technology > TA Engineering (General). Civil engineering (General) |
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Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | ||||||
Library of Congress Subject Headings (LCSH): | Structural dynamics, Nanostructures, Electron microscopy, Cytology -- Technique | ||||||
Journal or Publication Title: | Proceedings of the National Academy of Sciences | ||||||
Publisher: | National Academy of Sciences | ||||||
ISSN: | 0027-8424 | ||||||
Official Date: | 12 June 2023 | ||||||
Dates: |
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Volume: | 120 | ||||||
Number: | 25 | ||||||
Article Number: | e2221956120 | ||||||
DOI: | 10.1073/pnas.2221956120 | ||||||
Status: | Peer Reviewed | ||||||
Publication Status: | Published | ||||||
Access rights to Published version: | Open Access (Creative Commons) | ||||||
Date of first compliant deposit: | 23 June 2023 | ||||||
Date of first compliant Open Access: | 26 June 2023 | ||||||
RIOXX Funder/Project Grant: |
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