期刊
CHEMNANOMAT
卷 6, 期 4, 页码 576-588出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/cnma.202000049
关键词
Metal nanocrystal; palladium; halide; seed-mediated growth; reaction kinetics
资金
- National Science Foundation [CHE-1804970, ECCS-1542174]
- Georgia Tech
Despite the pivotal roles played by halide ions (e. g., Cl- and Br-) in directing the evolution of seeds into metal nanocrystals with diverse shapes, it is still unclear how halides affect the reduction kinetics of a salt precursor and thus the outcome of a synthesis. Here we report a quantitative analysis of the multiple roles played by halides in controlling the growth behaviors of Pd seeds with cubic and octahedral shapes, respectively. Our quantitative measurements clearly indicate the existence of a transition point around 10(-3) mM min(-1) for the reduction rate, which separates the reduction into two distinctive pathways (solution versus surface) for the formation of completely different products. More significantly, we demonstrate that the speciation, reduction kinetics, and reduction pathway of a Pd(II) precursor can all be manipulated by varying the type and/or amount of halides introduced into a synthesis for the deterministic formation of a specific product. This work represents a critical step forward in achieving a quantitative understanding of the multiple roles of halides involved in the shape-controlled synthesis of Pd nanocrystals, with the knowledge potentially extendible to other noble metals and their alloys.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据