Stress-induced phase transformation and optical coupling of silver nanoparticle superlattices into mechanically stable nanowires
Stress-induced phase transformation and optical coupling of silver nanoparticle superlattices into mechanically stable nanowires
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DOI：
10.1038/ncomms5179
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发表时间：
2014-06-01
影响因子：
16.6
通讯作者：
Fan, Hongyou
中科院分区：
文献类型：
--
作者：
Li, Binsong;Wen, Xiaodong;Fan, Hongyou
一维银材料具有独特的光学和电学特性，有望成为新一代纳米电子学的功能块。迄今为止，银纳米线的合成方法和性能工程主要集中在化学方法上。本文报道了一种基于应力诱导相变和烧结球形银纳米粒子超晶格的金属纳米线的简单物理合成方法。在不同长度尺度下，纳米颗粒在应力作用下发生了两种相变。首先，银纳米粒子超晶格的晶格尺寸可以在0-8 GPa的压应力范围内被可逆地操纵，从而使银纳米粒子之间的中尺度光学耦合发生系统和可逆的变化。其次，大于8GPa的应力诱导原子晶格相变，导致银纳米粒子烧结成微米级纳米线；纳米线的合成机制既依赖于纳米颗粒的表面取向，也依赖于特定晶界的存在，从而使纳米颗粒固结成纳米线。
One-dimensional silver materials display unique optical and electrical properties with promise as functional blocks for a new generation of nanoelectronics. To date, synthetic approaches and property engineering of silver nanowires have primarily focused on chemical methods. Here we report a simple physical method of metal nanowire synthesis, based on stress-induced phase transformation and sintering of spherical Ag nanoparticle superlattices. Two phase transformations of nanoparticles under stress have been observed at distinct length scales. First, the lattice dimensions of silver nanoparticle superlattices may be reversibly manipulated between 0-8 GPa compressive stresses to enable systematic and reversible changes in mesoscale optical coupling between silver nanoparticles. Second, stresses greater than 8GPa induced an atomic lattice phase transformation, which induced sintering of silver nanoparticles into micron-length scale nanowires. The nanowire synthesis mechanism displays a dependence on both nanoparticle crystal surface orientation and presence of particular grain boundaries to enable nanoparticle consolidation into nanowires.