Probing Nucleation Pathways for Morphological Manipulation of Platinum Nanocrystals

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• 作者：Tao Yao ; Shoujie Liu ; Zhihu Sun ; Yuanyuan Li ; Shi He ; Hao Cheng ; Yi Xie ; Qinghua Liu ; Yong Jiang ; Ziyu Wu ; Zhiyun Pan ; Wensheng Yan ; Shiqiang Wei
• 刊名：The Journal of the American Chemical Society
• 出版年：2012
• 出版时间：June 6, 2012
• 年：2012
• 卷：134
• 期：22
• 页码：9410-9416
• 全文大小：446K
• 年卷期：v.134,no.22(June 6, 2012)
• ISSN：1520-5126

文摘

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鈥搗is 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 鈥淧t_nCl_x鈥?complexes from the polymerization of linear 鈥淐l₃Pt鈥揚tCl₃鈥?dimers and spherical 鈥淧t_n⁰鈥?clusters from the aggregation of Pt⁰ 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.