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

Autor:	Alekseev PA; Ioffe Institute, Saint-Petersburg, 194021, Russia., Borodin BR; Ioffe Institute, Saint-Petersburg, 194021, Russia., Geydt P; Physical Faculty, Novosibirsk State University, Novosibirsk, 630090, Russia.; Department of Physics, LUT University, FI-53850 Lappeenranta, Finland., Khayrudinov V; Department of Electronics and Nanoengineering, Micronova, Aalto University, FI-00076 Espoo, Finland., Bespalova K; Department of Physics, LUT University, FI-53850 Lappeenranta, Finland.; Department of Electrical Engineering and Automation, Aalto University, FI-02150 Espoo, Finland., Kirilenko DA; Ioffe Institute, Saint-Petersburg, 194021, Russia., Reznik RR; St. Petersburg State University, Saint-Petersburg, 199034, Russia., Nashchekin AV; Ioffe Institute, Saint-Petersburg, 194021, Russia., Haggrén T; Department of Electronics and Nanoengineering, Micronova, Aalto University, FI-00076 Espoo, Finland., Lähderanta E; Department of Physics, LUT University, FI-53850 Lappeenranta, Finland., Cirlin GE; St. Petersburg State University, Saint-Petersburg, 199034, Russia.; Alferov University, Saint-Petersburg, 194021, Russia., Lipsanen H; Department of Electronics and Nanoengineering, Micronova, Aalto University, FI-00076 Espoo, Finland., Dunaevskiy MS; Ioffe Institute, Saint-Petersburg, 194021, Russia.
Jazyk:	angličtina
Zdroj:	Nanotechnology [Nanotechnology] 2021 Jul 02; Vol. 32 (38). Date of Electronic Publication: 2021 Jul 02.
DOI:	10.1088/1361-6528/ac0ac7
Abstrakt:	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. (© 2021 IOP Publishing Ltd.)
Databáze:	MEDLINE
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