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

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Author(s): Kristine A. Bertness; Norman A. Sanford; Albert Davydov;
Title: The effect of growth orientation and diameter on the elasticity of GaN Nanowires - a combined insitu TEM and atomistic modeling investigation
Published: December 20, 2010
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
Pages: pp. 548 - 555
Keywords: Gallium nitride nanowires, nanowire elastic modulus, in situ testing, first-principles calculations, molecular dynamics, size effect, surface reconstruction
Research Areas: Optoelectronics, Nanomanufacturing, U.S. Measurement System
PDF version: PDF Document Click here to retrieve PDF version of paper (398KB)