Solid-liquid-solid process for forming free-standing gold nanowhisker superlattice by interfering femtosecond laser irradiation
Solid-liquid-solid process for forming free-standing gold nanowhisker superlattice by interfering femtosecond laser irradiation
复制标题
DOI：
10.1016/j.apsusc.2013.02.042
复制
发表时间：
2013-06-01
影响因子：
6.7
通讯作者：
Hiromoto, T.
中科院分区：
文献类型：
--
作者：
Nakata, Y.;Miyanaga, N.;Hiromoto, T.
一维纳米材料超晶格是等离子体动力学、纳米光子学和纳米电子学的基本组成部分。自底向上的技术，如气液固（VLS）和化学合成已经被用来制造这种结构，但对于控制排列和尺寸不是最优的。在这里，我们报告了基于一种称为固体-液体-固体（SLS）的新机制的金纳米晶须超晶格的制备。一个干扰飞秒激光脉冲诱导纳米级金的流体流动，随后液滴从它们身上脱落并冻结固定在衬底上的独立纳米晶须超晶格。它的形状是由液体运动决定的，而不是由晶体生长决定的，尽管它的结构是多晶的。其顶点的最小曲率半径为3.4 nm，是化学合成的最小纳米棒的一半。SLS工艺是一个优越的替代顺序自下而上的过程，包括催化剂制造，自下而上的合成，纯化，对准，稳定和保存。(C) 2013 Elsevier B.V.版权所有
One-dimensional nanomaterial superlattices are fundamental components in plasmonics, nanophotonics, and nanoelectronics. Bottom-up techniques such as vapour-liquid-solid (VLS) and chemosynthesis have been used to fabricate the structure but are nonoptimal for controlling alignment and size. Here we report the fabrication of gold nanowhisker superlattice, based on a novel mechanism termed solid-liquid-solid (SLS). An interfering femtosecond laser pulse induces fluid flows of nanosize gold, which is followed by droplets pinching off from them and freezing of a free-standing nanowhisker super-lattice fixed on a substrate. The shape is defined by liquid motion and not by crystallographic growth although its structure is polycrystalline. The smallest curvature radius of its vertex was 3.4 nm, which is one-half of the smallest nanorods fabricated by chemosynthesis. SLS process is a superior alternative to sequential bottom-up processes involving catalyst fabrication, bottom-up synthesis, purification, alignment, stabilization, and preservation. (C) 2013 Elsevier B.V. All rights reserved.