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Kwon, Oh Hoon
Ultrafast Laser Spectroscopy and Nano-microscopy (ULSaN Lab)
Research Interests
  • Femtochemistry/biology, 4D electron microscopy, structural dynamics, materials phenomena

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Nanoscale Mechanical Drumming Visualized by 4D Electron Microscopy

Cited 34 times inthomson ciCited 31 times inthomson ci
Title
Nanoscale Mechanical Drumming Visualized by 4D Electron Microscopy
Author
Kwon, Oh HoonBarwick, BrettPark, Hyun SoonBaskin, J. SpencerZewail, Ahmed H.
Issue Date
2008-11
Publisher
AMER CHEMICAL SOC
Citation
NANO LETTERS, v.8, no.11, pp.3557 - 3562
Abstract
With four-dimensional (4D) electron microscopy, we report in situ imaging of the mechanical drumming of a nanoscale material. The single crystal graphite film is found to exhibit global resonance motion that is fully reversible and follows the same evolution after each initiating stress pulse. At early times, the motion appears "chaotic" showing the different mechanical modes present over the micron scale. At longer time, the motion of the thin film collapses into a well-defined fundamental frequency of 1.08 MHz, a behavior reminiscent of mode locking; the mechanical motion damps out after ∼200 μs and the oscillation has a "cavity" quality factor of 150. The resonance time is determined by the stiffness of the material, and for the 75 nm thick and 40 μm square specimen used here we determined Young's modulus to be 1.0 TPa for the in-plane stress-strain profile. Because of its real-time dimension, this 4D microscopy should have applications in the study of these and other types of materials structures.
URI
https://scholarworks.unist.ac.kr/handle/201301/8744
URL
http://www.scopus.com/inward/record.url?partnerID=HzOxMe3b&scp=56749136897
DOI
10.1021/nl8029866
ISSN
1530-6984
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CHM_Journal Papers
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