Abstract In this article, the effect of the distinctiveness and arrangements on the plasmonic resonance of Cu–Ag system were studied by finite element method, and the effect of morphologies on the plasmonic properties of Cu@Ag core@shell NPs and Cu–Ag corn-cob liked NPs was investigated by experiment. For Cu@Ag core-shell structure, as the fixed thickness of Ag-shell at 10 nm, the dipole plasmon resonance gradually blue-shifts with increasing the radius of Cu core, and as the fixed radius of Cu-core at 50 nm, the feature peak shows a red-shift and broadening with increasing the thickness of Ag shell. For Cu–Ag corn-cob structure, the feature for different Ag coverage are similar to each other and most of the them follow the blue-shifted tendency with the increase the degree of Ag-coverage. Furthermore, as the regular-shaped structure increases (form trigonal to spherical), the plasmon resonance gradually blue shifts, and finally, we use two parameters to describe the different idealized Cu–Ag structure: separation, exterior contact, intersection and core@shell. The combined information from our simulation and experiment will give guidelines for choosing adequate particles when aiming at certain plasmonic properties.

中文翻译：

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Cu-Ag双金属系统的等离子体响应：独特性和排列的影响

摘要 本文采用有限元方法研究了Cu-Ag体系的独特性和排列对等离子体共振的影响，以及形态对Cu@Ag核@壳纳米粒子和Cu-Ag玉米等离子体性质的影响。 -cob 喜欢的 NPs 通过实验进行了研究。对于Cu@Ag核壳结构，随着Ag壳厚度在10 nm处的固定，偶极等离子体共振随着Cu核半径的增加而逐渐蓝移，随着Cu核在50 nm处的固定半径，随着银壳厚度的增加，特征峰显示红移和加宽。对于Cu-Ag玉米芯结构，不同Ag覆盖率的特征彼此相似，并且随着Ag覆盖程度的增加，大多数都遵循蓝移趋势。此外，随着规则形状结构的增加（从三角形到球形），等离子体共振逐渐蓝移，最后，我们使用两个参数来描述不同的理想化 Cu-Ag 结构：分离、外部接触、交叉和核@壳。来自我们的模拟和实验的综合信息将为在针对某些等离子体特性时选择合适的粒子提供指导。