核壳结构的Cu/NiO和Cu/Cu2O纳米线的等离激元研究
沈 希，王 晓，姚 湲，孙 静*, 禹日成*
（1. 中国科学院物理研究所，北京凝聚态物理国家研究中心，北京100190；
2. 中国科学院上海硅酸盐研究所，高性能陶瓷和超微结构国家重点实验室，上海200050；
3. 中国科学院大学物理学院，北京100190）
摘 要 本文对Cu（核）/NiO（壳）和Cu（核）/Cu2O（壳）纳米线的显微结构以及等离激元特征分别进行了研究。在扫描透射电子显微学模式下对两个样品分别进行了电子能量损失谱面扫描，不同的能量范围成像可以区分表面等离激元以及体等离激元特征峰的分布区域。研究表明表面等离激元的影响区域超过了纳米线的实际边界。通过测量样品表面等离激元特征峰的衰减距离，发现其最强点均接近纳米线内侧边缘，且和表面形态有关。
关键词 表面等离激元；体等离激元；电子能量损失谱；扫描透射电子显微学
中图分类号：O539；O463+.1；TG115.21+5.3
文献标识码：A doi:10.3969/j.issn.1000-6281.2022.0５.00８
The surface and volume plasmons study of Cu(core)NiO(shell) and Cu(core) Cu2O (shell) nanowires
SHEN Xi1，WANG Xiao2，YAO Yuan1，SUN Jing2*，YU Ri-cheng1，3*
（1. Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190；2. State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050；3. School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100190, China）
Abstract The characteristics of microstructures and plasmons for the Cu (core)/NiO (shell) and Cu (core)/Cu2O (shell) nanowires were studied, respectively. We carried out the electron energy-loss spectroscopy (EELS) mapping and line scanning measurements in the scanning transmission electron microscopy (STEM). By imaging with different energy ranges, we distinguished the distribution regions of the characteristic peaks of surface and volume plasmons. The influenced region of surface plasmons exceeds the actual boundary of nanowires. By measuring the variation curve of surface plasmon characteristic peaks, it is found that the highest values are located on the inner side of the nanowires nearby the surface.
Keywords surface plasmon; volume plasmon; electron energy-loss spectroscopy; scanning transmission electron microscopy
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