Liquid-like pseudoelasticity of sub-10-nm crystalline silver particles
Liquid-like pseudoelasticity of sub-10-nm crystalline silver particles
复制标题
亚 10 nm 结晶银颗粒的液体拟弹性
DOI：
10.1038/nmat4105
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发表时间：
2014-11-01
期刊：
影响因子：
41.2
通讯作者：
Li, Ju
中科院分区：
文献类型：
--
作者：
Sun, Jun;He, Longbing;Li, Ju
在纳米技术中，具有大表面积的小体积金属被用作电极、催化剂、互连和天线（1-4）。然而，它们在室温下的形状稳定性受到质疑。使用原位高分辨率透射电子显微镜，我们发现Ag纳米颗粒可以像液滴一样变形，但在内部保持高度结晶，在变形过程中没有位错活动的迹象（5，6）。表面扩散介导的伪弹性变形在室温下是明显的，这可以由外力或毛细能量最小化驱动。原子模拟证实，这种极不寻常的Coble伪弹性确实可以在室温下和从几秒到几个月的时间尺度下发生在10纳米以下的Ag颗粒上。
In nanotechnology, small-volume metals with large surface area are used as electrodes, catalysts, interconnects and antennae(1-4). Their shape stability at room temperature has, however, been questioned. Using in situ high-resolution transmission electron microscopy, we find that Ag nanoparticles can be deformed like a liquid droplet but remain highly crystalline in the interior, with no sign of dislocation activity during deformation(5,6). Surface-diffusion-mediated pseudoelastic deformation is evident at room temperature, which can be driven by either an external force or capillary-energy minimization. Atomistic simulations confirm that such highly unusual Coble pseudoelasticity can indeed happen for sub-10-nm Ag particles at room temperature and at timescales from seconds to months.