Morphology-Invariant Metallic Nanoparticles with Tunable Plasmonic Properties
Morphology-Invariant Metallic Nanoparticles with Tunable Plasmonic Properties
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DOI：
10.1021/acsnano.0c06123
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发表时间：
2021-01-29
期刊：
影响因子：
17.1
通讯作者：
Xia, Xiaohu
中科院分区：
文献类型：
--
作者：
Gao, Zhuangqiang;Shao, Shikuan;Xia, Xiaohu
目前用于调节金属纳米颗粒的等离子体性质的方法通常依赖于改变纳米颗粒的形态(即，尺寸和/或形状)。等离子体纳米粒子的形态变化往往会影响其在某些应用中的性能。在这项研究中，我们报道了一种基于内部结构控制的有效方法来设计具有可调等离子体性质的形态不变纳米颗粒。具体地说，这些纳米粒子是通过在预制的Ag-Au合金纳米笼内表面选择性生长Ag作为种子而制备的，形成了Ag@(Ag-Au)壳@壳纳米笼。通过改变内表面沉积的银量，可以方便而有效地调节Ag@(Ag-Au)纳米笼的等离子体性质，在此过程中，纳米笼的整体形貌保持不变。为了展示Ag@(Ag-Au)纳米笼的潜在应用，将其应用于人类癌胚抗原(CEA)的比色传感，获得了较低的检测下限。这项工作为设计和制作等离子体纳米粒子提供了一个有意义的概念。
Current methods for tuning the plasmonic properties of metallic nanoparticles typically rely on alternating the morphology (i.e., size and/or shape) of nanoparticles. The variation of morphology of plasmonic nanoparticles oftentimes impairs their performance in certain applications. In this study, we report an effective approach based on the control of internal structure to engineer morphology-invariant nanoparticles with tunable plasmonic properties. Specifically, these nanoparticles were prepared through selective growth of Ag on the inner surfaces of preformed Ag-Au alloyed nanocages as the seeds to form Ag@(Ag-Au) shell@shell nanocages. Plasmonic properties of the Ag@(Ag-Au) nanocages can be conveniently and effectively tuned by varying the amount of Ag deposited on the inner surfaces, during which the overall morphology of the nanocages remains unchanged. To demonstrate the potential applications of the Ag@(Ag-Au) nanocages, they were applied to colorimetric sensing of human carcinoembryonic antigen (CEA) that achieved low detection limits. This work provides a meaningful concept to design and craft plasmonic nanoparticles.