Importance of Pd Distribution to Au–Pd Nanocrystals with High Refractive Index Sensitivity
Importance of Pd Distribution to Au–Pd Nanocrystals with High Refractive Index Sensitivity
复制标题
Pd 分布对高折射率灵敏度金钯纳米晶体的重要性
DOI：
10.1021/acs.jpcc.1c02907
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发表时间：
2021
期刊：
影响因子：
--
通讯作者：
Skrabalak, Sara E.
中科院分区：
文献类型：
--
作者：
Woessner, Zachary J.;Chen, Alexander N.;Skrabalak, Sara E.
等离子体金属纳米颗粒（NPs）在从治疗学到化学传感的各种应用中显示出前景，化学传感通过局部表面等离子体共振（LSPR）对周围介电环境的敏感性而成为可能。金纳米粒子由于其狭窄的等离子体带、可调的LSPR最大值和相对的化学稳定性而成为LSPR传感应用的标准；然而，相对较低的折射率灵敏度（RIS）和金纳米结构的形态不稳定性是限制因素。最近的研究发现，将Pd加入到Au体系中可以增加RIS并赋予多功能，但Pd在Au基纳米结构中的分布如何影响LSPR传感尚不清楚。本文制备了不同Au-Pd分布的Au-Pd异质结构，系统地研究了Pd分布对RIS的影响。具体来说，选择具有对称分支的金纳米晶体（即章鱼）作为构建块，因为它们的分支尖端局部集中了电场。以这些纳米晶体为种子，合成了pd尖端的Au章鱼和core@shell Au@Pd章鱼，并与合金Au - pd章鱼和全Au章鱼进行了比较。通过实验和模拟，我们发现RIS取决于Pd负载和Au - Pd异质结构中的位置，其中Pd尖端的Au章鱼显示出最高的RIS，同时保持适度的优点。该系统分析强调，Pd在LSPR热点的定位对于实现最高RIS至关重要，这一见解旨在指导未来超越全金标准的LSPR传感器的设计。
Plasmonic metal nanoparticles (NPs) show promise in a variety of applications, ranging from theranostics to chemical sensing, with chemical sensing made possible by the sensitivity of the localized surface plasmon resonance (LSPR) to the surrounding dielectric environment. Au NPs have been the standard for LSPR sensing applications due to their narrow plasmon band, tunable LSPR maximum, and relative chemical stability; however, the comparatively low refractive index sensitivity (RIS) and morphological instability of Au nanostructures are limiting factors. Recent research has found that incorporating Pd into Au systems can increase RIS and impart multifunctionality, but how the distribution of Pd within Au-based nanostructures affects LSPR sensing is unclear. Here, Au–Pd heterostructures with different Au–Pd distributions were prepared to systematically study the effect of Pd distribution on RIS. Specifically, symmetrically branched Au nanocrystals withOhsymmetry (i.e., octopods) were selected as building blocks as their branch tips concentrate E-fields locally. Using these nanocrystals as seeds, Pd-tipped Au octopods and core@shell Au@Pd octopods were synthesized for comparison to alloy Au–Pd octopods and all-Au octopods. Through experiment and simulation, we show that RIS depends both on Pd loading and location in Au–Pd heterostructures, with the Pd-tipped Au octopods displaying the highest RIS while maintaining a moderate figure of merit. This systematic analysis highlights that localization of Pd at LSPR hotspots is critical to achieving the highest RIS, with this insight intended to guide design of future LSPR sensors that move beyond the all-Au standard.
通过双金属纳米晶体的内部和外部组成来设计高折射率灵敏度。
影响因子：
6.7
作者：
Alison F. Smith;Samantha M Harvey;S. Skrabalak;Rebecca G. Weiner
通讯作者：
Rebecca G. Weiner
影响因子：
7
作者：
Kadkhodazadeh, Shima;Nugroho, Ferry Anggoro Ardy;Wagner, Jakob B.
通讯作者：
Wagner, Jakob B.
结构与成分：等离激元双金属纳米晶体的单粒子研究
DOI：
--
发表时间：
2015
期刊：
影响因子：
--
作者：
Alison F. Smith;Rebecca G. Weiner;Matthew M. Bower;B. Dragnea;S. Skrabalak
通讯作者：
S. Skrabalak