Department of Materials Science and Engineering, Nagoya Institute of Technology, Showa-ku, Nagoya, Japan.
Nanotechnology. 2010 Jan 22;21(3):035605. doi: 10.1088/0957-4484/21/3/035605.
In this paper, Pt nanoparticles with good shapes of nanocubes and nano-octahedra and well-controlled sizes in the range 5-7 and 8-12 nm, respectively, have been successfully synthesized. The modified polyol method by adding silver nitrate and varying the molar ratio of the solutions of silver nitrate and H(2)PtCl(6) has been used to produce Pt nanoparticles of the size and shape to be controlled. The size and morphology of Pt nanoparticles have been studied by transmission electron microscopy (TEM) and high resolution TEM (HRTEM). The results have shown that their very sharp and good shapes exist in the main forms of cubic, cuboctahedral, octahedral and tetrahedral shapes directly related to the crystal nucleation along various directions of the [100] cubic, [111] octahedral and [111] tetrahedral facets during synthesis. In particular, various irregular and new shapes of Pt nanoparticles have been found. Here, it is concluded that the role of silver ions has to be considered as an important factor for promoting and controlling the development of Pt nanoparticles of [100] cubic, [111] octahedral and [111] tetrahedral facets, and also directly orienting the growth and formation of Pt nanoparticles.
本文成功合成了具有良好纳米立方体和纳米八面体形状以及尺寸分别在 5-7nm 和 8-12nm 范围内得到良好控制的 Pt 纳米粒子。通过添加硝酸银并改变硝酸银和 H(2)PtCl(6)溶液的摩尔比，采用改进的多元醇法来制备尺寸和形状可控的 Pt 纳米粒子。通过透射电子显微镜（TEM）和高分辨率 TEM（HRTEM）研究了 Pt 纳米粒子的尺寸和形态。结果表明，它们的形状非常尖锐且良好，主要以立方、立方八面体、八面体和四面体形状存在，这直接与合成过程中沿着[100]立方、[111]八面体和[111]四面体晶面的各个方向的晶体成核有关。特别是，发现了各种不规则和新的 Pt 纳米粒子形状。这里可以得出结论，银离子的作用必须被视为促进和控制[100]立方、[111]八面体和[111]四面体晶面的 Pt 纳米粒子发展以及直接定向 Pt 纳米粒子生长和形成的重要因素。
