Optical Properties of Noncontinuous Gold Shell Engineered on Silica Mesosphere

Optical Properties of Noncontinuous Gold Shell Engineered on Silica Mesosphere
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二氧化硅介层上非连续金壳的光学性质

DOI:
10.1007/s11468-013-9604-0
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发表时间:
2014-02
期刊:
影响因子:
3
通讯作者:
Fang, Yan
Fang, Yan
中科院分区:
物理与天体物理3区
文献类型:
--
作者:
Li, Zhipeng;Wang, Peijie;Zhang, Lisheng;Fang, Yan

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通过单粒子暗场散射测量和不同激发波长下的单粒子表面增强拉曼散射(SERS)测量,研究了不同金覆盖度的不连续壳层的光学性质。通过控制金种子的生长,在二氧化硅中间球上组装了具有不同光学响应的多金属纳米GaP/缝隙,形成了不连续的壳层,通过透射电子显微镜图像可以证实这一点。我们发现随着金覆盖度的增加,单壳层的表面等离子体共振峰从510 nm红移到680 nm。在532和785nm光激发下,金覆盖率分别为60%和83%的球体分别获得了约2 × 105和1 1 × 107的最佳增强效果。弱偏振相关的表面增强拉曼散射表明,这种增强来自于单个不连续壳层上的多个间隙。这种光学可调谐和SERS活性的非连续金壳可以应用于生物传感、超痕量检测和需要多波长激发的分子分析。
The optical properties of individual noncontinuous shells with different gold coverage are investigated by the single-particle dark field scattering measurements and single-particle surface-enhanced Raman scattering (SERS) measurements at different excitation wavelengths. By controlling the growth of gold seeds, multi-metallic nanogaps/crevices with different optical responses are assembled on silica mesospheres forming noncontinuous shells that can be confirmed through the transmission electron microscope images. We find the surface plasmon resonance of single shell red-shifts from 510 to 680 nm with the increase of gold coverage. At the excitation of 532 and 785 nm, the best enhancements about 2.0 × 105and 1.1 × 107are obtained on spheres with ∼60 and 83 % gold coverage, respectively. The weak polarization-dependent SERS indicates that the enhancement is from the multi-gaps on single noncontinuous shell. This optical tunable and SERS active noncontinuous gold shell can be applied in biosensing, ultra trace detection, and molecule analysis needing multi-wavelengths excitation.
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