论文标题
在三个维
Probing the atomically diffuse interfaces in core-shell nanoparticles in three dimensions
论文作者
论文摘要
核壳纳米材料中固体接口的三维原子结构是了解其出色的催化性，光学和电子性能的关键。在这里，我们使用原子分辨率电子层析成像探测了单原子水平的钯 - 铂核壳纳米颗粒的三维原子结构。我们成功地量化了丰富的核心壳纳米颗粒的结构种类，包括键长，协调数，局部键取向顺序，晶界和五倍的对称性，均以原子分辨率为3D。与其形成原子上的边界，核心壳界面在原子上是分散的，平均厚度为4.2 a，而与粒子的大小，形态或晶体学纹理无关。界面中的高浓度PD与PD种子的电二层高度相关。这些结果可以提高我们对基本层面核心壳结构的理解，从而为纳米材料操纵和化学性质调节提供潜在的策略。
Deciphering the three-dimensional atomic structure of solid-solid interfaces in core-shell nanomaterials is the key to understand their remarkable catalytical, optical and electronic properties. Here, we probe the three-dimensional atomic structures of palladium-platinum core-shell nanoparticles at the single-atom level using atomic resolution electron tomography. We successfully quantify the rich structural variety of core-shell nanoparticles including bond length, coordination number, local bond orientation order, grain boundary, and five-fold symmetry, all in 3D at atomic resolution. Instead of forming an atomically-sharp boundary, the core-shell interface is atomically diffuse with an average thickness of 4.2 A, irrespective of the particle's size, morphology, or crystallographic texture. The high concentration of Pd in the interface is highly related to the electric double layers of the Pd seeds. These results advance our understanding of core-shell structures at the fundamental level, providing potential strategies into nanomaterial manipulation and chemical property regulation.
