Bimetallic Nanoshells for Metal - Enhanced Fluorescence with Broad Band Fluorophores.
Bimetallic Nanoshells for Metal - Enhanced Fluorescence with Broad Band Fluorophores.
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DOI：
10.1021/jp3057527
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发表时间：
2012-11-15
影响因子：
3.7
通讯作者：
Mandavi, Farhad
中科院分区：
文献类型：
--
作者：
Zhang, Jian;Fu, Yi;Mandavi, Farhad
在这篇文章中，我们报道了Ru（bpy）32+配合物和等离子体共振之间的近场相互作用的纳米壳。通过沉积10 nm的单壳或多壳，在20 nm的二氧化硅球上制备金属纳米壳作为核。有接近。15 Ru（bpy）~（32+）配合物。金属壳体由银或/和金构成。可以在均匀或非均匀的几何形状中生成双壳。均匀的银壳含有10 nm的银-金合金。异质的金壳含有连续的5 nm金和5 nm银壳，或者，5 nm银和5 nm金壳。利用系综光谱和单颗粒成像测量方法研究了金属纳米壳的光学性质。发现非均质双金属壳相对于单金属壳或均质双金属壳具有大尺度的金属增强发射。这是因为非均质的双壳层可以显示分裂的双等离子体共振，其可以与二氧化硅核中的Ru（bpy）32+络合物的激发和发射带相互作用，导致更有效的近场相互作用。预测可以通过寿命来证明。因此，它是建议，无论是组成和几何形状的金属壳可以影响与核心中的荧光团的相互作用。这一观察结果也为我们提供了一个机会，开发等离子体基荧光金属纳米粒子作为新的纳米粒子成像剂，具有高性能的荧光细胞或组织成像。
In this article, we reported the near-field interactions between the Ru(bpy)32+ complexes and plasmon resonances from the bimetallic nanoshells. The metallic nanoshells were fabricated on 20 nm silica spheres as cores by depositing 10 nm monometallic or bimetallic shells. There were approx. 15 Ru(bpy)32+ complexes in the silica core. The metal shells were constituted of silver or/and gold. The bimetallic shells could be generated in homogeneous or heterogeneous geometries. The homogeneous bimetallic shells contained 10 nm silver-gold alloys. The heterogeneous bimetallic shells contained successive 5 nm gold and 5 nm silver shells, or alternatively, 5 nm silver and 5 nm gold shells. Optical properties of metal nanoshells were studied on both the ensemble spectra and single nanoparticle imaging measurements. The heterogeneous bimetallic shells were found to have a large scale of metal-enhanced emission relative to the monometallic or homogeneous bimetallic shells. It is because the heterogeneous bimetallic shells may display split dual plasmon resonances which can interact with the excitation and emission bands of the Ru(bpy)32+ complexes in the silica cores leading to more efficient near-field interactions. The prediction can be demonstrated by the lifetimes. Therefore, it is suggested that both the compositions and geometries of the metal shells can influence the interactions with the fluorophores in the cores. This observation also offers us an opportunity for developing plasmon-based fluorescence metal nanoparticles as novel nanoparticle imaging agents which have high performances in fluorescence cell or tissue imaging.
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影响因子：
10.8
作者：
Ferrer, D.;Torres-Castro, A.;Jose-Yacaman, M.
通讯作者：
Jose-Yacaman, M.
影响因子：
4.3
作者：
McMahon, Jeffrey M.;Henry, Anne-Isabelle;Schatz, George C.
通讯作者：
Schatz, George C.
影响因子：
3
作者：
Steinbrueck, A.;Csaki, A.;Fritzsche, W.
通讯作者：
Fritzsche, W.
影响因子：
3.3
作者：
Lee, Kyeong-Seok;El-Sayed, Mostafa A.
通讯作者：
El-Sayed, Mostafa A.
影响因子：
3.3
作者：
Wang, X;Zhang, ZY;Hartland, GV
通讯作者：
Hartland, GV