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Kim, Sung Youb
Computational Advanced Nanomechanics (CAN) Lab
Research Interests
  • Computational Mechanics
  • Nanomechanics
  • Molecular Dynamics
  • FEM

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The Importance of Edge Effects on the Intrinsic Loss Mechanisms of Graphene Nanoresonators

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Title
The Importance of Edge Effects on the Intrinsic Loss Mechanisms of Graphene Nanoresonators
Author
Kim, Sung YoubPark, Harold S
Keywords
Applied stress; Atomistic simulations; Classical molecular dynamics; Edge effects; Edge-atoms; Free edges; Graphene; Hydrogen passivations; Intrinsic loss; Nano-resonators; Operating temperatures; Q factors; Quality (q) factor; Tensile mechanical strains; Vibrational properties; Vibrational state
Issue Date
2009-03
Publisher
AMER CHEMICAL SOC
Citation
NANO LETTERS, v.9, no.3, pp.969 - 974
Abstract
We utilize classical molecular dynamics simulations to Investigate the intrinsic loss mechanisms of monolayer graphene nanoresonators undergoing flexural oscillations. We find that spurious edge modes of vibration, which arise not due to externally applied stresses but intrinsically due to the different vibrational properties of edge atoms, are the dominant Intrinsic loss mechanism that reduces the quality (Q) factors. We additionally find that while hydrogen passivation of the free edges is ineffective in reducing the spurious edge modes, fixing the free edges Is critical to removing the spurious edge-induced vibrational states. Our atomistic simulations also show that the 0 factor degrades inversely proportional to temperature; furthermore, we also demonstrate that the Intrinsic losses can be reduced significantly across a range of operating temperatures through the application of tensile mechanical strain.
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DOI
10.1021/nl802853e
ISSN
1530-6984
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