In Situ Liquid Cell Electron Microscopy of the Solution Growth of Au-Pd Core-Shell Nanostructures
In Situ Liquid Cell Electron Microscopy of the Solution Growth of Au-Pd Core-Shell Nanostructures
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DOI：
10.1021/nl4014277
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发表时间：
2013-06-01
期刊：
影响因子：
10.8
通讯作者：
Sutter, E. A.
中科院分区：
文献类型：
--
作者：
Jungjohann, K. L.;Bliznakov, S.;Sutter, E. A.
使用原位液池电子显微镜，我们研究了Pd的生长在含有Au纳米粒子种子的稀钯盐水溶液。Au-Pd核-壳纳米结构是通过Pd-0的沉积形成的，Pd-0是通过自由基还原氯钯酸盐络合物而产生的，例如由溶液中的电子束诱导的水合电子（e（aq）（-））。的大小和形状的Au种子决定的形态的Pd壳，通过优先的Pd掺入低配位的网站和避免扩展的方面。在离聚焦电子束不同距离处的Au颗粒上结合的Pd的分析提供了生长过程的定量图像，并且显示生长受到溶液中e（aq）（-）的扩散的限制。
Using in situ liquid cell electron microscopy we investigate Pd growth in dilute aqueous Pd salt solutions containing Au nanoparticle seeds. Au-Pd core-shell nanostructures are formed via deposition of Pd-0, generated by the reduction of chloropalladate complexes by radicals, such as hydrated electrons (e(aq)(-)) induced by the electron beam in the solution. The size and shape of the Au seeds determine the morphology of the Pd shells, via preferential Pd incorporation in low-coordination sites and avoidance of extended facets. Analysis of the Pd incorporation on Au particles at different distances from a focused electron beam provides a quantitative picture of the growth process and shows that the growth is limited by the diffusion of e(aq)(-) in the solution.