4 years ago

Passivation Effect of Gold Nanoparticles on Uniform Beam-Induced Structural Changes of Amorphous SiOx Nanowire

Passivation Effect of Gold Nanoparticles on Uniform Beam-Induced Structural Changes of Amorphous SiOx Nanowire
Xianfang Zhu, Jiangbin Su
Passivation effect of heterogeneous Au nanoparticles (AuNPs) on the structural changes at the nanoscale (or so-called nanoinstability) of amorphous SiOx nanowire (a-SiOx NW) as athermally induced by uniform electron beam (e-beam) irradiation is investigated in an in situ transmission electron microscope. It is found that at room temperature the straight and uniform a-SiOx NW demonstrates a considerable uniform plastic elongation and an accelerated uniform radial shrinkage at the nanoscale. However, once being modified with AuNPs, the nanocurved sidewall surface of a-SiOx NW becomes intriguingly passivated. As a consequence, both the elongation and the radial shrinkage of the AuNPs-modified a-SiOx NW are greatly retarded. A new mechanism of athermal diffusion and plastic flow combined with athermal evaporation as driven by the nanocurvature of a-SiOx NW and the beam-induced soft mode and instability of atomic vibration, which are different from the existing knock-on mechanism, is proposed to elucidate the observed new phenomena.

Publisher URL: http://dx.doi.org/10.1021/acs.jpcc.7b03160

DOI: 10.1021/acs.jpcc.7b03160

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