Effect of crystal structure on the Young's modulus of GaP nanowires

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A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
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Date
2021-09-17
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Language
en
Pages
8
Series
Nanotechnology, Volume 32, issue 38
Abstract
Young's modulus of tapered mixed composition (zinc-blende with a high density of twins and wurtzite with a high density of stacking faults) gallium phosphide (GaP) nanowires (NWs) was investigated by atomic force microscopy. Experimental measurements were performed by obtaining bending profiles of as-grown inclined GaP NWs deformed by applying a constant force to a series of NW surface locations at various distances from the NW/substrate interface. Numerical modeling of experimental data on bending profiles was done by applying Euler-Bernoulli beam theory. Measurements of the nano-local stiffness at different distances from the NW/substrate interface revealed NWs with a non-ideal mechanical fixation at the NW/substrate interface. Analysis of the NWs with ideally fixed base resulted in experimentally measured Young's modulus of 155 +/- 20 GPa for ZB NWs, and 157 +/- 20 GPa for WZ NWs, respectively, which are in consistence with a theoretically predicted bulk value of 167 GPa. Thus, impacts of the crystal structure (WZ/ZB) and crystal defects on Young's modulus of GaP NWs were found to be negligible.
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Keywords
GaP, nanowire, atomic force microscopy, WZ, ZB, Young's modulus, bending, III-V NANOWIRES, MECHANICAL-PROPERTIES, GAAS NANOWIRES, WURTZITE, RESONANCE, STRESS, CELL
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Citation
Alekseev , P A , Borodin , B R , Geydt , P , Khayrudinov , V , Bespalova , K , Kirilenko , D A , Reznik , R R , Nashchekin , A , Haggren , T , Lahderanta , E , Cirlin , G E , Lipsanen , H & Dunaevskiy , M S 2021 , ' Effect of crystal structure on the Young's modulus of GaP nanowires ' , Nanotechnology , vol. 32 , no. 38 , 385706 . https://doi.org/10.1088/1361-6528/ac0ac7