文章基本信息

标题：Reliable and cost effective design of intermetallic Ni2Si nanowires and direct characterization of its mechanical properties
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作者：Seung Zeon Han ; Joonhee Kang ; Sung-Dae Kim 等
期刊名称：Scientific Reports
电子版ISSN：2045-2322
出版年度：2015
卷号：5
期号：1
DOI：10.1038/srep15050
语种：English
出版社：Springer Nature
摘要：We report that a single crystal Ni₂Si nanowire (NW) of intermetallic compound can be reliably designed using simple three-step processes: casting a ternary Cu-Ni-Si alloy, nucleate and growth of Ni₂Si NWs as embedded in the alloy matrix via designing discontinuous precipitation (DP) of Ni₂Si nanoparticles and thermal aging, and finally chemical etching to decouple the Ni₂Si NWs from the alloy matrix. By direct application of uniaxial tensile tests to the Ni₂Si NW we characterize its mechanical properties, which were rarely reported in previous literatures. Using integrated studies of first principles density functional theory (DFT) calculations, high-resolution transmission electron microscopy (HRTEM), and energy-dispersive X-ray spectroscopy (EDX) we accurately validate the experimental measurements. Our results indicate that our simple three-step method enables to design brittle Ni₂Si NW with high tensile strength of 3.0 GPa and elastic modulus of 60.6 GPa. We propose that the systematic methodology pursued in this paper significantly contributes to opening innovative processes to design various kinds of low dimensional nanomaterials leading to advancement of frontiers in nanotechnology and related industry sectors.