General Approach to the Synthesis of Heterodimers of Metal Nanoparticles through Site-Selected Protection and Growth
General Approach to the Synthesis of Heterodimers of Metal Nanoparticles through Site-Selected Protection and Growth
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DOI：
10.1021/acs.nanolett.9b03167
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发表时间：
2019-09-01
期刊：
影响因子：
10.8
通讯作者：
Xia, Younan
中科院分区：
文献类型：
--
作者：
Qiu, Jichuan;Xie, Minghao;Xia, Younan
金属纳米颗粒的异源二聚体被广泛寻求用于光子学、传感和催化。在这项工作中，我们展示了一种通用的方法来制造金属纳米粒子的异质二聚体，利用的概念下的惰性材料的保护下的选址生长。当苯乙烯在Au纳米颗粒存在下聚合时，可以控制所得聚苯乙烯（PS）仅从纳米颗粒表面的一部分生长。不含PS，剩余部分可以用作第二金属的非均质成核和生长的活性位点。在溶解PS组分后，我们获得了具有可调元素组成和可控物理尺寸的金属纳米颗粒的异二聚体。两种金属之间的接触面积也可以通过调节用于与苯乙烯共聚的二乙烯基苯的浓度来增加。利用这种方法，我们制备了Au-Ag，Au-Pd和Au-Pt异质二聚体，并进一步研究了它们的等离子体性质。这种方法的能力应该是可扩展的异二聚体的制造具有更广泛的组成和性能。
Heterodimers of metal nanoparticles are widely sought for applications in photonics, sensing, and catalysis. In this work, we demonstrate a general approach to the fabrication of heterodimers of metal nanoparticles by leveraging the concept of site-selected growth under the protection of an inert material. When styrene is polymerized in the presence of Au nanoparticles, the resultant polystyrene (PS) can be controlled to grow from only one portion of the surface of a nanoparticle. Free of PS, the remaining portion can serve as an active site for the heterogeneous nucleation and growth of the second metal. After dissolving the PS component, we obtain heterodimers of metal nanoparticles with tunable elemental compositions and controllable physical dimensions. The contact area between the two metals can also be maneuvered by adjusting the concentration of divinylbenzene used for copolymerization with styrene. Using this method, we have prepared Au-Ag, Au-Pd, and Au-Pt heterodimers and further investigated their plasmonic properties. The capability of this approach should be extendible to the fabrication of heterodimers with a broader range of compositions and properties.