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The effect of growth orientation and diameter on the elasticity of GaN Nanowires - a combined insitu TEM and atomistic modeling investigation

Published

Author(s)

Kristine A. Bertness, Norman Sanford, Albert Davydov

Abstract

We characterized the elastic properties of GaN nanowires grown along different crystallographic orientations. In situ transmission electron microscopy tensile tests were conducted using a MEMS-based nanoscale testing system. Complementary atomistic simulations were performed using density functional theory and molecular dynamics. Our work establishes that elasticity size dependence is limited to nanowires with diameters smaller than 20 nm. For larger diameters, the elastic modulus converges to the bulk values of 300 GPa for c-axis and 267 GPa for a- and m-axis.
Citation
Nano Letters
Issue
11

Keywords

Gallium nitride nanowires, nanowire elastic modulus, in situ testing, first-principles calculations, molecular dynamics, size effect, surface reconstruction

Citation

Bertness, K. , Sanford, N. and Davydov, A. (2010), The effect of growth orientation and diameter on the elasticity of GaN Nanowires - a combined insitu TEM and atomistic modeling investigation, Nano Letters, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=906878 (Accessed April 15, 2024)
Created December 19, 2010, Updated October 12, 2021