Mechanical Response of Aluminum Nanowires via Orbital-Free Density Functional Theory

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Abstract:

Thin aluminum nanowires of widths 0.3 nm to 6.0 nm are investigated using orbital-free density functional theory. Predictions of the minimum energy structures of ultrathin aluminum nanowires as a function of the one-dimensional atomic density are given. Quasistatic orbital-free density functional theory calculations suggest that thin aluminum nanowires of bulk face-centered cubic morphology originally oriented in the [001] direction may undergo a transition to either a body-centered tetragonal [001] or a face-centered cubic [110] orientation under compression. The stable body-centered tetragonal [001] wire is almost 30% shorter than the original stable face-centered cubic [001] wire. The relative stability of the two states is tunable by varying the size of the nanowires. It may be possible to switch the state of the nanowire by uniaxial compression and expansion, leading to applications as a nanoscale actuator or switch.

Keywords: ALUMINUM; NANOWIRE; ORBITAL-FREE DENSITY FUNCTIONAL THEORY; PSEUDOELASTICITY; ULTRATHIN

Document Type: Research Article

DOI: http://dx.doi.org/10.1166/jctn.2009.1172

Publication date: June 1, 2009

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  • Journal of Computational and Theoretical Nanoscience is an international peer-reviewed journal with a wide-ranging coverage, consolidates research activities in all aspects of computational and theoretical nanoscience into a single reference source. This journal offers scientists and engineers peer-reviewed research papers in all aspects of computational and theoretical nanoscience and nanotechnology in chemistry, physics, materials science, engineering and biology to publish original full papers and timely state-of-the-art reviews and short communications encompassing the fundamental and applied research.
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