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Circular Gold Nanodisks with Synthetically Tunable Diameters and Thicknesses
Advanced Functional Materials ( IF 18.5 ) Pub Date : 2018-01-15 , DOI: 10.1002/adfm.201705516
Ximin Cui 1 , Feng Qin 1 , Qifeng Ruan 1 , Xiaolu Zhuo 1 , Jianfang Wang 1
Affiliation  

2D or pseudo‐2D plasmonic Au nanocrystals, such as circular Au nanodisks, possess unique plasmonic properties. Circular Au nanodisks not only possess two large surfaces with circular symmetry but also exhibit the wide tunability for their plasmon resonance. However, the lack of effective synthetic methods for producing size‐tunable and monodispersed circular Au nanodisks hinders further studies on their properties and applications. Herein, the synthesis of uniformly sized circular Au nanodisks with synthetically tunable diameters and thicknesses is reported. By performing mild anisotropic oxidation on pregrown Au nanoplates with different thicknesses, the thicknesses of the obtained nanodisks are varied from ≈10 nm to ≈50 nm. The nanodisk diameters are tailored from ≈50 nm to ≈150 nm by controlling the oxidation time. Moreover, both homodimers and heterodimers made of circular Au nanodisks are constructed using molecular linkers. They exhibit rich plasmon modes. In particular, dark multipolar plasmon resonance modes can be excited and observed in the asymmetric heterodimers. Such circular Au nanodisks with controllable sizes, large atomically flat surfaces, and a dominant dipolar plasmon mode are ideal building blocks for constructing plasmonic assemblies and plasmon‐coupled systems with desired plasmonic properties and functions.

中文翻译:

具有可合成直径和厚度的圆形金纳米盘

2D或伪2D等离子体Au纳米晶体(例如圆形Au纳米盘)具有独特的等离子体性质。圆形金纳米盘不仅具有两个大的圆形对称表面,而且还具有等离子共振的广泛可调性。然而,由于缺乏有效的合成方法来生产尺寸可调和单分散的圆形金纳米盘,阻碍了对其性能和应用的进一步研究。在此,报道了具有可合成调整的直径和厚度的均一尺寸的圆形金纳米盘的合成。通过在具有不同厚度的预生长金纳米板上进行温和的各向异性氧化,获得的纳米盘的厚度从≈10nm到≈50nm不等。通过控制氧化时间,可以将纳米盘的直径从≈50nm调整为≈150nm。而且,圆形金纳米盘制成的同二聚体和异二聚体均使用分子接头构建。它们表现出丰富的等离子体激元模式。特别地,可以在不对称异二聚体中激发并观察到黑暗的多极等离子体激元共振模式。此类圆形Au纳米盘具有可控制的大小,较大的原子平面和主要的偶极等离激元模式,是构建具有所需等离子特性和功能的等离激元组件和等离激元耦合系统的理想构建基块。
更新日期:2018-01-15
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