Institut Catala de Nanotecnologia, Barcelona, Spain.
Nano Lett. 2010 Mar 10;10(3):964-73. doi: 10.1021/nl100032c.
The introduction of metallic traces into the synthesis of platinum nanocrystals (Pt NCs) has been investigated as a surfactant-independent means of controlling shape. Various nanocrystal morphologies have been produced without modification of the reaction conditions, composition, and concentration other than the presence of cobalt traces (<5%). In the presence of metallic cobalt (a strong reducer for Pt cations) cubic Pt NCs are obtained, while cobalt ions or gold NCs have no effect on the synthesis, and as a result, polypods are obtained. Intermediate shapes such as cemented cubes or cuboctahedron NCs are also obtained under similar conditions. Thus, various NC shapes can be obtained with subtle changes, which illustrates the high susceptibility and mutability of the NC shape to modification of the reaction kinetics during the early reduction process. Our studies help progress toward a general mechanism for nanocrystal shape control.
在铂纳米晶体（Pt NCs）的合成中引入金属痕迹已被研究作为一种非表面活性剂的控制形状的方法。在不改变反应条件、组成和浓度（除了存在 5%以下的钴痕迹外）的情况下，已经制备出各种纳米晶体形态。在金属钴（Pt 阳离子的强还原剂）的存在下，得到立方 Pt NCs，而钴离子或金 NCs 对合成没有影响，因此得到了多足形。在类似条件下，也可以得到中间形状，如粘结立方体形或立方八面体 NCs。因此，可以通过细微的变化获得各种 NC 形状，这说明了 NC 形状在早期还原过程中对反应动力学的修饰具有很高的敏感性和可变性。我们的研究有助于朝着纳米晶体形状控制的一般机制取得进展。
