Optical Property-Composition Correlation in Noble Metal Alloy Nanoparticles Studied with EELS
Optical Property-Composition Correlation in Noble Metal Alloy Nanoparticles Studied with EELS
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DOI：
10.1021/acsphotonics.8b01791
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发表时间：
2019-03-01
期刊：
影响因子：
7
通讯作者：
Wagner, Jakob B.
中科院分区：
文献类型：
--
作者：
Kadkhodazadeh, Shima;Nugroho, Ferry Anggoro Ardy;Wagner, Jakob B.
贵金属是目前等离子体学中最常见的组成部分，因此定义了光学性质的可用范围。他们的合金化为设计具有可调光学响应范围的新材料提供了一种可行的策略。尽管有这一诱人的前景，但许多贵金属合金的组成和光学性质之间的联系仍然没有得到很好的理解。本文采用电子能量损失谱法系统地研究了不同组成的AuAg和AuPd纳米颗粒。研究了这两组合金的局部表面等离子体激元、体等离子体激元和介电常数函数及其组成的函数。在更广泛研究的情况下，与先前的实验和理论研究结果一致。在较少仔细研究的AuPd系统上的结果提供了非常有价值的实验数据，补充了其他实验研究并支持理论模型的发展。
Noble metals are currently the most common building blocks in plasmonics and thus define the available range of optical properties. Their alloying provides a viable strategy to engineer new materials with a tunable range of optical responses. Despite this attractive prospect, the link between composition and optical properties of many noble metal alloys is still not well understood. Here, electron energy-loss spectroscopy is employed to systematically study AuAg and AuPd nanoparticles of varying compositions. The localized surface plasmons, the bulk plasmons, and the permittivity functions of these two sets of alloys are investigated as functions of their composition. In the case of the more widely studied AuAg alloy system, good agreement is found with previous experimental and theoretical studies. The results on the less scrutinized AuPd system provide highly valuable experimental data that complements other experimental investigations and supports the development of theoretical models.