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Author

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

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On the utility of vacancies and tensile strain-induced quality factor enhancement for mass sensing using graphene monolayers

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Title
On the utility of vacancies and tensile strain-induced quality factor enhancement for mass sensing using graphene monolayers
Author
Kim, Sung YoubPark, Harold S.
Keywords
Classical molecular dynamics; Effective mass; Elevated temperature; Graphenes; Higher temperatures; Mass sensing; Operating temperature; Q-factors; Quality factors; Single atoms; Single vacancies; Tensile mechanical strain
Issue Date
201003
Publisher
IOP PUBLISHING LTD
Citation
NANOTECHNOLOGY, v.21, no.10, pp.1 - 8
Abstract
We have utilized classical molecular dynamics to investigate the mass sensing potential of graphene monolayers, using gold as the model adsorbed atom. In doing so, we report two key findings. First, we find that while perfect graphene monolayers are effective mass sensors at very low (T < 10 K) temperatures, their mass sensing capability is lost at higher temperatures due to diffusion of the adsorbed atom at elevated temperatures. We demonstrate that even if the quality (Q) factors are significantly elevated through the application of tensile mechanical strain, the mass sensing resolution is still lost at elevated temperatures, which demonstrates that high Q-factors alone are insufficient to ensure the mass sensing capability of graphene. Second, we find that while the introduction of single vacancies into the graphene monolayer prevents the diffusion of the adsorbed atom, the mass sensing resolution is still lost at higher temperatures, again due to Q-factor degradation. We finally demonstrate that if the Q-factors of the graphene monolayers with single vacancies are kept acceptably high through the application of tensile strain, then the high Q-factors, in conjunction with the single atom vacancies to stop the diffusion of the adsorbed atom, enable graphene to maintain its mass sensing capability across a range of technologically relevant operating temperatures.
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DOI
http://dx.doi.org/10.1088/0957-4484/21/10/105710
ISSN
0957-4484
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