Adsorbate migration effects on continuous and discontinuous temperature-dependent transitions in the quality factors of graphene nanoresonators

Jin Wu Jiang, Bing Shen Wang, Harold S. Park, Timon Rabczuk

Research output: Contribution to journalArticle

14 Citations (Scopus)

Abstract

We perform classical molecular dynamics simulation to investigate the mechanisms underpinning the unresolved, experimentally observed temperature-dependent scaling transition in the quality factors of graphene nanomechanical resonators (GNMRs). Our simulations reveal that the mechanism underlying this temperature scaling phenomenon is the out-of-plane migration of adsorbates on GNMRs. Specifically, the migrating adsorbate undergoes frequent collisions with the GNMR, which strongly influences the resulting mechanical oscillation, and thus the quality factors. We also predict a discontinuous transition in the quality factor at a lower critical temperature, which results from the in-plane migration of the adsorbate. Overall, our work clearly demonstrates the strong effect of adsorbate migration on the quality factors of GNMRs.

Original languageEnglish
Article number025501
JournalNanotechnology
Volume25
Issue number2
DOIs
Publication statusPublished - 2014 Jan 17

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Keywords

  • adsorbate migration
  • energy dissipation
  • graphene nanoresonator
  • temperature scaling

ASJC Scopus subject areas

  • Bioengineering
  • Chemistry(all)
  • Electrical and Electronic Engineering
  • Mechanical Engineering
  • Mechanics of Materials
  • Materials Science(all)

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