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

Prokhor A. Alekseev, Bogdan R. Borodin, Pavel Geydt, Vladislav Khayrudinov, Kristina Bespalova, Demid A. Kirilenko, Rodion R. Reznik, Alexey V. Nashchekin, Tuomas Haggrén, Erkki Lähderanta, George E. Cirlin, Harri Lipsanen, Mikhail S. Dunaevskiy

Research output: Contribution to journalArticlepeer-review

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.

Original languageEnglish
Article number385706
JournalNanotechnology
Volume32
Issue number38
DOIs
Publication statusPublished - 17 Sep 2021

Keywords

  • atomic force microscopy
  • bending
  • GaP
  • nanowire
  • WZ/ZB
  • Young s modulus

OECD FOS+WOS

  • 2.11 OTHER ENGINEERING AND TECHNOLOGIES
  • 1.04 CHEMICAL SCIENCES
  • 2.02 ELECTRICAL ENG, ELECTRONIC ENG
  • 2.05 MATERIALS ENGINEERING
  • 2.03 MECHANICAL ENGINEERING

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