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Publication Citation: Temperature-dependent mechanical-resonance frequencies and damping in ensembles of gallium nitride nanowires

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Author(s): Kristine A. Bertness; Norman A. Sanford; J. R. Montague; H.S. Park; Victor M. Bright; C. T. Rogers;
Title: Temperature-dependent mechanical-resonance frequencies and damping in ensembles of gallium nitride nanowires
Published: October 22, 2012
Abstract: We have measured singly clamped cantilever mechanical-resonances in ensembles of as-grown gallium nitridenanowires (GaN NWs), from 12 K to 320 K. Resonance frequencies are approximately linearly dependent on temperature near 300 K with relative shifts of 40 {plus or minus} 20 ppm/K, consistent with temperature-dependent elastic moduli. Below 100 K, we find that some GaN NWs have mechanical quality factors well above 400 000, at mechanical resonance frequencies near 1 MHz. We also observe a correlation between increased amplitude of dissipation and increased temperature dependence of resonance frequencies. The microwavehomodyne detection technique we use is simple, allows for the investigation of as-grown or processed NWs, and is sensitive enough to observe the thermal motion of individual NWs while providing for the simultaneous measurement of large ensembles of NW mechanical resonances.
Citation: Applied Physics Letters
Volume: 101
Issue: 17
Pages: 5 pp.
Research Areas: Nanomechanics, Nanofabrication, Nanomanufacturing, and Nanoprocessing, Nanotechnology, Characterization, Nanometrology, and Nanoscale Measurements
DOI: http://dx.doi.org/10.1063/1.4761946  (Note: May link to a non-U.S. Government webpage)
PDF version: PDF Document Click here to retrieve PDF version of paper (1MB)