Surface-enhanced Raman scattering underlay of #-shaped nano electromagnetic super medium

A technology of surface-enhanced Raman and electromagnetic metamedia, which is applied in the field of surface spectroscopy, can solve the problems that restrict the reliability of quantitative analysis of surface-enhanced Raman scattering technology and the practical industrial application, particle size, shape distribution state and agglomeration state are difficult to control, Instability of experimental results and other problems, to achieve high stability, improve reproducibility, neatly arranged effect

Inactive Publication Date: 2010-03-17
ZHENGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the particle size, shape, distribution and agglomeration of these substrates are difficult to control, so using these substrates for surface-enhanced Raman scattering experiments will lead to unstable experimental results and poor reproducibility, which greatly restricts Reliability and practical industrial application of surface-enhanced Raman scattering technique for quantitative analysis

Method used

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  • Surface-enhanced Raman scattering underlay of #-shaped nano electromagnetic super medium
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  • Surface-enhanced Raman scattering underlay of #-shaped nano electromagnetic super medium

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Experimental program
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Effect test

Embodiment 1

[0029] Such as figure 1 As shown in a and b, refer to the nanoimprint lithography disclosed in the document Kebin Li et al.Surface enhanced Raman scattering on long-rangd ordered noble-metal nanocrescent arrays, Nanotechnology 19 (2008) 145305, using metal material gold on the substrate glass 1 constructs a #-shaped nanostructure unit 2, two horizontal bars or two vertical bars are parallel to each other, and the horizontal bars and vertical bars are perpendicular to each other. At the same time, the nanostructure unit 2 is periodically on the two axes of the substrate glass 1 ( P=260nm) are arranged to form a two-dimensional array structure, wherein the length of the horizontal or vertical rods a=b=140nm, the width of the horizontal or vertical rods c=d=40nm, the distance between the horizontal or vertical rods e=f=10nm, and the horizontal or vertical rods Or vertical bar thickness h=30nm.

[0030] Effect example

[0031]In the following effect example, the three-dimensiona...

Embodiment 2

[0034] Using #-shaped gold nano-electromagnetic metamedia as a surface-enhanced Raman scattering substrate:

[0035] Such as figure 1 As shown, gold is used as the metal material to construct the #-shaped nano-electromagnetic supermedium on the glass substrate, the length of the nanorod a=b=140nm, the width c=d=40nm, the thickness h=30nm, the spacing e=f=10nm, the structure The cell period P=260nm. The resulting extinction spectrum is as figure 2 As shown, there are two strong plasmon resonance peaks at 753nm and 605nm respectively, accompanied by a weaker third-order mode at about 529nm. Due to the symmetry of the structure, the same dual-band response effect can be obtained when the incident light is polarized along the x or y direction.

[0036] The resonance wavelength of this structure can be adjusted in a large range (547-1168nm). When the polarization direction of the incident light is along the vertical rod (ie, the y direction), the rod length a is increased from ...

Embodiment 3

[0039] The #-shaped silver nano-electromagnetic metamedia is used as the surface-enhanced Raman scattering substrate.

[0040] Such as figure 1 As shown, silver is used as the metal material to construct the #-shaped nano-electromagnetic supermedium on the silicon substrate, the length of the nanorod a=b=140nm, the width c=d=40nm, the thickness h=30nm, the spacing e=f=10nm, the unit Period P = 260nm. The resulting extinction spectrum is as Figure 5 As shown, there are two strong plasmon resonance peaks located at 664nm and 503nm respectively. Due to the symmetry of the structure, the same dual-band response effect can be obtained when the incident light is polarized along the x or y direction.

[0041] The resonance wavelength of this structure can be adjusted in a large range (477-1074nm). When the polarization direction of the incident light is along the vertical rod (ie, the y direction), the rod length a is increased from 140nm to 240nm, and N=1 The central wavelength...

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Abstract

The invention concretely discloses a surface-enhanced Raman scattering underlay of a #-shaped nano electromagnetic super medium, belonging to the technical field of surface optical spectrum. The underlay consists of a substrate and #-shaped nano metal structural units which are periodically arranged on the substrate to form a two-dimensional array on the substrate. The underlay of the invention has two-waveband electromagnetic field resonance response, high electromagnetic filed and Raman scattering enhanced effect, high stability and reproducibility; resonance wavelength can be adjusted within the range from visible light to near infrared light (from blue light to near infrared light) and cover most of laser wavelength of modern Raman spectrum technology; the simple structure is a single-layer plane structure capable of being realized by panel nanoimprint technology and suitably being manufactured in large scale; and the obtained underlay unit is arranged tidily, thereby greatly improving the reproducibility of the surface-enhanced Raman scattering test.

Description

technical field [0001] The invention belongs to the technical field of surface spectroscopy, and in particular relates to a #-shaped nano-electromagnetic metamaterial surface-enhanced Raman scattering substrate. Background technique [0002] C.V.Raman discovered the Raman scattering effect in 1928, and won the Nobel Prize in Physics for this. As an important tool for studying molecular structure and microstructure of various substances, Raman spectroscopy has been widely used. However, due to the low detection sensitivity of Raman spectroscopy, it is difficult to detect surface or interface molecules, which greatly limits its application. In 1974, Fleschmann in the United Kingdom found that strong Raman scattering of adsorbed pyridine molecules could be obtained on the surface of a rough silver electrode, and believed that this was caused by the increase in the surface area of ​​the rough surface, which increased the number of adsorbed molecules. In 1977, after careful expe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/65B82B1/00
Inventor 梁二军胡伟琴丁佩
Owner ZHENGZHOU UNIV
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