Plasmonic Properties of Single Multispiked Gold Nanostars: Correlating Modeling with Experiments
Plasmonic Properties of Single Multispiked Gold Nanostars: Correlating Modeling with Experiments
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DOI：
10.1021/la2048097
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发表时间：
2012-06-19
期刊：
影响因子：
3.9
通讯作者：
Wang, Jianfang
中科院分区：
文献类型：
--
作者：
Shao, Lei;Susha, Andrei S.;Wang, Jianfang
金纳米星，拥有多个尖锐的尖峰，已成为有前途的等离子体粒子在超灵敏传感领域。我们已经开发了一种基于水的方法，用于高产量合成的大小可调的各向异性的金纳米粒子与不同数量的尖刺表面突起，并进行了系统的实验和理论分析的光学性质的单一的金纳米星的表征，同时与扫描电子显微镜和暗场散射光谱。的形态和相应的散射光谱的个别金nanostars进行了比较，利用时域有限差分（FDTD）方法的等离子体共振的电磁模拟。该研究提供了实验和计算的散射光谱和电荷分布的不同的等离子体模式在个别金纳米星与不同的数量和相对取向的表面突起之间的相关性。我们的研究结果为选择具有适当数量的尖峰和适当尺寸的核心和臂的特定等离子体应用以及进一步开发多尖峰金属纳米颗粒的制备方法提供了指导。
Gold nanostars, possessing multiple sharp spikes, have emerged as promising plasmonic particles in the field of ultrasensitive sensing. We have developed a water-based method for high-yield synthesis of size-tunable anisotropic gold nanoparticles with a varying number of spiky surface protrusions, and performed systematic experimental and theoretical analyses of the optical properties of the single gold nanostars by characterizing them simultaneously with scanning electron microscopy and dark-field scattering spectroscopy. The morphologies and corresponding scattering spectra of the individual gold nanostars have been compared with electromagnetic simulations of the plasmonic resonances utilizing the finite-difference time-domain (FDTD) method. The study provides a correlation between the experimental and calculated scattering spectra and charge distributions of the different plasmon modes in the individual gold nanostars with varying numbers and relative orientations of surface protrusions. Our results provide guidelines for choosing gold nanostars with a proper number of spikes and appropriate dimensions of the core and arms for particular plasmonic applications as well as for further developing preparation methods of multispiked metal nanoparticles.