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基于星型金/银纳米粒子和双曲超材料的近红外表面增强拉曼散射。

Near infrared surface-enhanced Raman scattering based on star-shaped gold/silver nanoparticles and hyperbolic metamaterial.

机构信息

Department of Electronic Engineering, National Yunlin University of Science and Technology, Yunlin, 64002, Taiwan.

Institute of Optoelectronic Sciences, National Taiwan Ocean University, Keelung, 20224, Taiwan.

出版信息

Sci Rep. 2017 Jul 14;7(1):5446. doi: 10.1038/s41598-017-05939-0.

Abstract

It is desirable to extend the surface-enhanced Raman scattering (SERS) from the conventionally used visible range into the infrared region, because the fluorescence background is lower in the long-wavelength regime. To do this, it is important to have a SERS substrate suitable for infrared operation. In this work, we report the near infrared SERS operation based on the substrates employing star-shaped gold/silver nanoparticles and hyperbolic metamaterial (HMM) structure. We first fabricate the SERS substrate in which nanoparticles are separated from a silver film by a thin dielectric layer. Performance of the SERS substrate is investigated with a 1064-nm excitation source. Compared with similar silver film-based substrates employing respectively gold and silver spherical nanoparticles, it is found that, Raman intensity scattered by the substrate with star-shaped nanoparticles is 7.4 times stronger than that with gold nanoparticles, and 3.4 times stronger than that with silver nanoparticles. Following this, we fabricate the SERS substrate where the star-shaped nanoparticles are deposited over a HMM structure. The HMM structure comprises three pairs of germanium-silver multilayers. Further experimental result shows that, with the star-shaped nanoparticles, the HMM-based substrate yields 30% higher Raman intensity for near infrared SERS operation than the silver film-based substrate does.

摘要

将表面增强拉曼散射(SERS)从传统的可见光范围扩展到红外区域是可取的,因为在长波长范围内荧光背景更低。为此,拥有适合红外操作的 SERS 衬底非常重要。在这项工作中,我们报告了基于星形金/银纳米粒子和双曲超材料(HMM)结构的近红外 SERS 操作。我们首先制备了通过薄介电层将纳米粒子与银膜隔开的 SERS 衬底。使用 1064nm 激发源研究了 SERS 衬底的性能。与分别采用金和银球形纳米粒子的类似银膜基衬底相比,发现由星形纳米粒子组成的衬底散射的拉曼强度比金纳米粒子强 7.4 倍,比银纳米粒子强 3.4 倍。接下来,我们在 HMM 结构上制备了沉积有星形纳米粒子的 SERS 衬底。HMM 结构由三对锗-银多层组成。进一步的实验结果表明,对于近红外 SERS 操作,与银膜基衬底相比,具有星形纳米粒子的 HMM 基衬底的拉曼强度提高了 30%。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/546e/5511255/896a8232183d/41598_2017_5939_Fig1_HTML.jpg

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