Plasmon resonance shifts of Au-coated Au2S nanoshells: Insight into multicomponent nanoparticle growth
Plasmon resonance shifts of Au-coated Au2S nanoshells: Insight into multicomponent nanoparticle growth
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DOI：
10.1103/physrevlett.78.4217
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发表时间：
1997-06-02
影响因子：
8.6
通讯作者：
Halas, NJ
中科院分区：
文献类型：
--
作者：
Averitt, RD;Sarkar, D;Halas, NJ
在这封信中，我们对独特类型的纳米粒子（金属涂覆的介电纳米粒子）的光学特性进行了连贯的描述。这些结构以镀金 Au2S 纳米颗粒的形式自然存在。在纳米颗粒生长过程中，与等离子体相关的吸收峰的波长发生很大的变化，从大约 650 nm 到大约 900 nm。我们表明，这种等离激元峰位移纯粹是经典起源，并且仅由 Au 壳的相对厚度和 Au2S 核直径决定。对这些纳米颗粒光学性质的了解可用于阐明纳米颗粒的生长动力学。
In this Letter we present a coherent description of the optical properties of a unique type of nanoparticle, metal-coated dielectric nanoparticles. These structures occur naturally in the form of Au-coated Au2S nanoparticles. During the course of nanoparticle growth, the plasmon-related absorption peak undergoes very large shifts in wavelength, from similar to 650 to similar to 900 nm. We show that this plasmon peak shift is purely classical in origin and is determined solely by the relative thickness of the Au shell and the Au2S core diameter. This understanding of the optical properties of these nanoparticles is used to elucidate the nanoparticle growth kinetics.