Nanotech 2010 Vol. 2
Nanotech 2010 Vol. 2
Nanotechnology 2010: Electronics, Devices, Fabrication, MEMS, Fluidics and Computational

Nanostructured Materials & Devices Chapter 2

Crystalline/amorphous silicon core/shell nanowires under external loads: An atomistic simulation study

Authors: Q. Meng, Y. Jing

Affilation: Harbin Institute of Technology, China

Pages: 122 - 125

Keywords: Si/a-Si core-shell nanowires, elastic modulus, molecular dynamics

Abstract:
The nanomechanical properties of Si/a-Si core-shell NWs are investigated using molecular dynamics simulations with EDIP model. Under uniaxial compressive and tensile loading, the computed Young’s modulus increases as the radius of crystalline core increases and decreases as the thickness of amorphous shell increases. Whereas the critical strains are found to be independent of the size of crystalline cores and amorphous shells. For the nonaxial torsional and bending strains, both torsional stiffness and bending stiffness increase as the thickness of amorphous shell increases and also as the radius of crystalline core increases. In addition, the critical torsion angle rapidly decreases as the thickness of amorphous shells increases and also as the radius of crystalline core increases. However, the critical bending angles are independent of the size of crystalline cores and amorphous shells. These results show that the amorphous shell has significant effects on the mechanical properties of Si/a-Si core-shell NWs under external loadings.

Crystalline/amorphous silicon core/shell nanowires under external loads: An atomistic simulation study

ISBN: 978-1-4398-3402-2
Pages: 862
Hardcopy: $189.95