Synthesis and growth mechanism of long ultrafine gold nanowires with uniform diameter
Synthesis and growth mechanism of long ultrafine gold nanowires with uniform diameter
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DOI：
10.1063/1.3369441
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发表时间：
2010-04
影响因子：
3.2
通讯作者：
H. Kura;T. Ogawa
中科院分区：
文献类型：
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作者：
H. Kura;T. Ogawa
在85℃的反应温度范围内，通过氯化金的简单还原，合成了直径1.5 nm、长度超过100 μm的均匀金纳米线。油胺具有溶剂、表面活性剂和还原剂的多功能作用，表面活性剂通过吸附在特定的金晶体表面诱导各向异性生长。因此，Au纳米线沿着具有许多hcp原子堆栈的fcc-Au的⟨111⟩方向生长。在这种合成方法中，可以同时生成各种形状的金纳米结构，这与反应温度有很大的关系。金纳米线是由纳米颗粒重构或团聚而成的。该合成的金纳米线的生长机制与传统的各向异性生长的一维纳米线的生长机制有很大的不同。
Homogeneous Au nanowires with 1.5 nm diameters and lengths of over 100 μm were synthesized in an oleylamine matrix via the simple reduction of aurichloride in a limited reaction temperature range around 85 °C. Oleylamine has multifunctional roles as solvent, surfactant, and reductant, and the surfactant induce anisotropic growth by adsorbing on the specific Au crystalline surface. As a result, Au nanowires were grown along the ⟨111⟩ direction of fcc-Au having many hcp atomic stacks. In this synthesis method, various shapes of Au nanostructures were produced simultaneously and this was strongly dependent on the reaction temperature. Au nanowires were provided by reconstruction from nanoparticles or their agglomeration. The growth mechanism of the Au nanowire in this synthesis was found to be quite unique and different from that for a conventional one-dimensional nanostructure which is obtained by anisotropical growth with supplying atoms from external resources.