In-situ mechanical characterization of wurtzite InAs nanowires

Erdélyi, Róbert and Madsen, Morten Hannibal and Sáfrán, György and Hajnal, Zoltán and Lukács, István Endre and Fülöp, Gergő and Csonka, Szabolcs and Nygärd, Jesper and Volk, János (2012) In-situ mechanical characterization of wurtzite InAs nanowires. Solid State Communications, 152 (19). pp. 1829-1833. ISSN 0038-1098

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Abstract

High aspect ratio vertical InAs nanowires were mechanically characterized in a scanning electron microscope equipped with two micromanipulators. One, equipped with a calibrated atomic force microscope probe, was used for in-situ static bending of single nanowires along the 〈11–20〉 crystallographic direction. The other one was equipped with a tungsten tip for dynamic resonance excitation of the same nanowires. This setup enabled a direct comparison between the two techniques. The crystal structure was analyzed using transmission electron microscopy, and for InAs nanowires with a hexagonal wutzite crystal structure, the bending modulus value was found to BM=43.5 GPa. This value is significantly lower than previously reported for both cubic zinc blende InAs bulk crystals and InAs nanowires. Besides, due to their high resonance quality factor (Q>1200), the wurtzite InAs nanowires are shown to be a promising candidate for sub-femtogram mass detectors.

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