Probing nucleation pathways for morphological manipulation of platinum nanocrystals.
Probing nucleation pathways for morphological manipulation of platinum nanocrystals.
复制标题
DOI：
10.1021/ja302642x
复制
发表时间：
2012-05
影响因子：
15
通讯作者：
T. Yao;Shoujie Liu;Zhihu Sun;Yuanyuan Li;Shi-zhong He;H. Cheng;Yi Xie;Qinghua Liu;Yong Jiang-Yo
中科院分区：
文献类型：
--
作者：
T. Yao;Shoujie Liu;Zhihu Sun;Yuanyuan Li;Shi-zhong He;H. Cheng;Yi Xie;Qinghua Liu;Yong Jiang-Yo
了解纳米晶体的形成过程，将有助于有效地控制纳米材料的形貌和性能。在这里，在原位紫外-可见和X-射线吸收光谱相结合，以监测铂纳米晶体的溶液合成的成核途径的轨道。我们发现，通过改变还原剂的强度控制成核途径，可以有效地用于操纵所得的晶体形状。原位测量表明，在弱还原剂和强还原剂的情况下，发生了两种不同的成核事件，涉及线性“Cl（3）Pt-PtCl（3）”二聚体聚合形成一维“Pt（n）Cl（x）”配合物和Pt（0）原子聚集形成球形“Pt（n）（0）”簇;所得形貌分别为纳米线和纳米球。这项研究提供了一个至关重要的洞察纳米材料的颗粒形状和成核途径之间的相关性。
Understanding the formation process in the controlled synthesis of nanocrystals will lead to the effective manipulation of the morphologies and properties of nanomaterials. Here, in-situ UV-vis and X-ray absorption spectroscopies are combined to monitor the tracks of the nucleation pathways in the solution synthesis of platinum nanocrystals. We find experimentally that the control over nucleation pathways through changing the strength of reductants can be efficiently used to manipulate the resultant nanocrystal shapes. The in-situ measurements show that two different nucleation events involving the formation of one-dimensional "Pt(n)Cl(x)" complexes from the polymerization of linear "Cl(3)Pt-PtCl(3)" dimers and spherical "Pt(n)(0)" clusters from the aggregation of Pt(0) atoms occur for the cases of weak and strong reductants; and the resultant morphologies are nanowires and nanospheres, respectively. This study provides a crucial insight into the correlation between the particle shapes and nucleation pathways of nanomaterials.