Synthesis and Surface Plasmonic Characterization of Asymmetric Au Split Nanorings.,Nano Letters

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Synthesis and Surface Plasmonic Characterization of Asymmetric Au Split Nanorings.
Nano Letters ( IF 9.6 ) Pub Date : 2020-09-11 , DOI: 10.1021/acs.nanolett.0c03385
MohammadNavid Haddadnezhad ₁ , Sungjae Yoo ₁ , Jeongwon Kim ₁ , Jae-Myoung Kim ₂ , Jiwoong Son ₂ , Hyeon Seok Jeong ₃ , Doojae Park ₃ , Jwa-Min Nam ₂ , Sungho Park ₁

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In this Letter, a rational and stepwise method for the solution-phase synthesis of asymmetric Au split nanorings by adopting Au nanoprisms as a template has been demonstrated. The selective chemical etching of Au nanoprism tips activated the surface reactivity of edges and led to the selective deposition of Pt at the periphery of Au nanoplates. By controlling the total amount of Pt on the edges, different degrees of split Au@Pt nanorings were obtained; the subsequent Au coating around the Au@Pt scaffold eventually resulted in asymmetric Au hexagonal split nanorings. Their surface plasmonic features as a function of split degrees were investigated, including straight nanorods, bent nanorods, split nanorings, and full nanorings. The electrical field focusing using single-particle surface-enhanced Raman spectroscopy was evaluated under different polarization angles of the incident light for two different structures with the point gap and line gap between two arms.

中文翻译：

不对称Au分裂纳米环的合成和表面等离子表征。

在这封信中，已经证明了一种合理且逐步的方法，该方法以Au纳米棱镜为模板，用于溶液相合成不对称Au分裂纳米环。金纳米棱镜尖端的选择性化学刻蚀激活了边缘的表面反应性，并导致铂在金纳米板的外围选择性沉积。通过控制边缘上Pt的总量，获得了不同程度的Au @ Pt纳米环分裂态。随后在Au @ Pt支架周围的Au涂层最终导致不对称的Au六角形分裂纳米环。研究了它们的表面等离子体特征随分裂程度的变化，包括直的纳米棒，弯曲的纳米棒，分裂的纳米环和完整的纳米环。

更新日期：2020-09-11

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