Size- and temperature-dependent Young's modulus and size-dependent thermal expansion coefficient of nanowires

HL Sun and LY Chen and S Sun and TY Zhang, SCIENCE CHINA-TECHNOLOGICAL SCIENCES, 61, 687-698 (2018).

DOI: 10.1007/s11431-018-9227-8

Nanowires (NWs) exhibit size-dependent mechanical properties due to the high surface/volume ratio, in which temperature also plays an important role. The surface eigenstress model is further developed here to quantitatively predict the size-dependent mechanical properties of NWs and results in analytic formulas. Molecular dynamics (MD) simulations are conducted to study the size-dependent mechanical of 100, 110 and 111 Ni and Si nanowires within the temperature range of 100-400 K and the MD results verify perfectly the newly developed surface eigenstress model.

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