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首页> 外文期刊>RSC Advances >Intriguing uniform elongation and accelerated radial shrinkage in an amorphous SiOx nanowire as purely induced by uniform electron beam irradiation
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Intriguing uniform elongation and accelerated radial shrinkage in an amorphous SiOx nanowire as purely induced by uniform electron beam irradiation

机译：纯均匀的电子束辐照引起的非晶SiO x 纳米线中均匀的伸长率和径向收缩加速

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At room temperature, an intriguing athermal uniform elongation and accelerated radial shrinkage in a straight and uniform amorphous SiOx nanowire (a-SiOx NW) as purely induced by uniform electron beam (e-beam) irradiation (without any external tensile pulling) was in situ observed and investigated in transmission electron microscope. According to a new model for NW taking into account the NW nanocurvature over its surface as well as the beam-induced athermal activation, a kinetic relationship between the shrinking radius and the irradiation time was established. The fitting results demonstrated that a curvature-dependent surface energy at the nanoscale (so-called nanocurvature effect) much higher than that predicted from the existing theories was exerted on the elongation and shrinkage of the NW. At the same time, the so-induced plastic flow of massive atoms and surface diffusion of atoms presented as well a further direct experimental evidence for our predicted soft mode and instability of atomic vibration as induced under energetic beam irradiation in amorphous materials. The study has important implications for the nanoprocessing or nanostability of future NW-based structures or devices. More importantly, it further demonstrates that the nanocurvature effect and the beam-induced atomic vibration soft mode and instability effect, which have been normally neglected or inadequately taken into account in the current literature, are universal concepts and applicable to explanation of energetic beam-induced nanoinstability or nanoprocessing of low dimensional nanostructure in general.
机译：在室温下，直线且均匀的无定形SiO x 纳米线（a-SiO x NW）是由均匀电子束（电子束）辐照（无任何外部拉力）纯诱导的原位在透射电子显微镜中观察和研究。根据考虑到其表面上的NW纳米曲率以及光束诱导的非热活化的NW新模型，建立了收缩半径与辐照时间之间的动力学关系。拟合结果表明，在纳米尺度上，曲率相关的表面能（所谓的纳米曲率效应）比现有理论所预测的要高得多，这是对NW的伸长和收缩的影响。同时，如此诱导的大质量原子塑性流动和原子表面扩散也为我们预测的软模和在高能束辐照下在非晶态材料中诱发的原子振动的不稳定性提供了进一步的直接实验证据。这项研究对未来基于NW的结构或设备的纳米加工或纳米稳定性具有重要意义。更重要的是，它进一步证明了在当前文献中通常被忽略或未充分考虑的纳米曲率效应和束诱导的原子振动软模和失稳效应是通用概念，可用于解释高能束诱导通常是低维纳米结构的纳米不稳定或纳米加工。

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