Near-theoretical fracture strengths in native and oxidized silicon nanowires.

Nanotechnology

PubMedID: 27325151

DelRio FW, White RM, Krylyuk S, Davydov AV, Friedman LH, Cook RF. Near-theoretical fracture strengths in native and oxidized silicon nanowires. Nanotechnology. 2016;27(31):31LT02.
In this letter, fracture strengths s f of native and oxidized silicon nanowires (SiNWs) were determined via atomic force microscopy bending experiments and nonlinear finite element analysis. In the native SiNWs, s f in the Si was comparable to the theoretical strength of Si<111>, ˜22 GPa. In the oxidized SiNWs, s f in the SiO2 was comparable to the theoretical strength of SiO2, ˜6 to 12 GPa. THE RESULTS
indicate a change in the failure mechanism between native SiNWs, in which fracture originated via inter-atomic bond breaking or atomic-scale defects in the Si, and oxidized SiNWs, in which fracture initiated from surface roughness or nano-scale defects in the SiO2.