Extraordinary dynamic mechanical response of vanadium dioxide nanowires around the insulator to metal phase transition

Aaron Holsteen, In Soo Kim, Lincoln James Lauhon*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

30 Scopus citations

Abstract

Nanomechanical resonators provide a compelling platform to investigate and exploit phase transitions coupled to mechanical degrees of freedom because resonator frequencies and quality factors are exquisitely sensitive to changes in state, particularly for discontinuous changes accompanying a first-order phase transition. Correlated scanning fiber-optic interferometry and dual-beam Raman spectroscopy were used to investigate mechanical fluctuations of vanadium dioxide (VO 2 ) nanowires across the first order insulator to metal transition. Unusually large and controllable changes in resonator frequency were observed due to the influences of domain wall motion and anomalous phonon softening on the effective modulus. In addition, extraordinary static and dynamic displacements were generated by local strain gradients, suggesting new classes of sensors and nanoelectromechanical devices with programmable discrete outputs as a function of continuous inputs.

Original languageEnglish (US)
Pages (from-to)1898-1902
Number of pages5
JournalNano Letters
Volume14
Issue number4
DOIs
StatePublished - Apr 9 2014

Keywords

  • NEMS
  • fiber-optic interferometry
  • nanowire
  • phase transition
  • sensing

ASJC Scopus subject areas

  • Bioengineering
  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanical Engineering

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