论文标题
纳米颗粒的螺旋凹面表面的应变和晶体学鉴定
Strain and Crystallographic Identification of the Helically Concaved Surfaces of Nanoparticles
论文作者
论文摘要
识别纳米晶体的三维（3D）晶体平面和应变场分布对于光学，催化和电子应用至关重要。在这里，我们开发了一种方法，用于可视化手性金纳米颗粒的3D信息，并通过Bragg相干X射线衍射成像具有凹形间隙结构。精确确定了构成凹的手性隙的高磨砂索引平面的分布。解决了与手性间隙相邻的高度紧张区域，该区域与纳米颗粒的432对称形态及其相应的等离子特性相关，并从原子定义的结构上进行了数值预测。这种方法可以用作可视化纳米颗粒的3D晶体学和应变分布的一般表征平台，尤其是对于结构复杂性和局部异质性是主要决定因素的应用，如在等离子体学中的例证。
Identifying the three-dimensional (3D) crystal-plane and strain-field distributions of nanocrystals is essential for optical, catalytic, and electronic applications. Here, we developed a methodology for visualizing the 3D information of chiral gold nanoparticles with concave gap structures by Bragg coherent X-ray diffraction imaging. The distribution of the high-Miller-index planes constituting the concave chiral gap was precisely determined. The highly strained region adjacent to the chiral gaps was resolved, which was correlated to the 432-symmetric morphology of the nanoparticles and its corresponding plasmonic properties were numerically predicted from the atomically defined structures. This approach can serve as a general characterization platform for visualizing the 3D crystallographic and strain distributions of nanoparticles, especially for applications where structural complexity and local heterogeneity are major determinants, as exemplified in plasmonics.
