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Surface-enhanced raman scattering base on basis of special-material superabsorbers and preparation method thereof

A surface-enhanced Raman and metamaterial technology, applied in the fields of micro-nano photonics and bioanalytical chemistry, can solve the problem that the optical response wavelength range of broad-spectrum one-dimensional metamaterials is not enough to meet the practical application of broad-spectrum Raman scattering spectroscopic analysis, wide-spectrum The problems of unsatisfied spectral optical response, expensive and complex fabrication technology, etc., can simplify multiple vibration and rotation modes, save detection time and cost, and enhance the intensity of Raman scattering signals.

Inactive Publication Date: 2015-07-08
FUDAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005]Recently, a 1D metal-dielectric-metal metamaterial with broad-spectrum optical response (420-550 nm) was demonstrated as a surface-enhanced Raman scattering substrate to achieve effective Raman signal enhancement, but the production of this material relies heavily on expensive and complex fabrication techniques, so it is not suitable for practical applications that require low-cost large-area substrates[1]
In addition, one-dimensional metamaterials have strict requirements on the polarization of excitation light. Only in a certain polarization direction, one-dimensional metamaterials can support the phenomenon of surface plasmon resonance, which increases the difficulty of measurement.
In addition, the optical response wavelength range of the broadband one-dimensional metamaterial is still not enough to meet the practical application of broadband Raman scattering spectroscopy.
A simple fabrication method based on the self-assembly of metal materials was subsequently proposed and used to realize the fabrication of surface-enhanced Raman scattering substrates. Although this preparation method produced large-area and low-cost metamaterials by evaporation of metal materials, the wide The spectral optical response remains unsatisfied [2]

Method used

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  • Surface-enhanced raman scattering base on basis of special-material superabsorbers and preparation method thereof
  • Surface-enhanced raman scattering base on basis of special-material superabsorbers and preparation method thereof
  • Surface-enhanced raman scattering base on basis of special-material superabsorbers and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Example 1: Glass substrate / chrome adhesion layer / continuous silver film / SiO 2 Dielectric layer / gold nanoparticle layer

[0040] (1) With the glass substrate as the substrate, a 20 nm thick chromium film is deposited in the electron beam evaporation equipment, which can increase the adsorption force between the glass substrate and the upper continuous metal film, and continue to evaporate a 300 nm thick chromium film on the chromium film. Flat continuous Ag film on which 70 nm SiO is evaporated 2 Membrane as an isolation layer.

[0041] (2) In Ag / SiO 2 A gold film with a nominal thickness of 7 nm was continuously evaporated on the film. Since the thickness was less than the permeation threshold of the gold material, the top gold film self-assembled into gold nanoparticles separated from each other, such as figure 2 (a) shown.

[0042] (3) The prepared structure can achieve more than 70% optical absorption in the visible-near-infrared wavelength range from 450 ...

Embodiment 2

[0043] Example 2: Quartz substrate / silver nanoparticle layer / SiO 2 Dielectric layer / continuous silver film

[0044] (1) With the quartz substrate as the substrate, a silver film with a nominal thickness of 15 nm is first plated in a magnetron sputtering equipment. Since the thickness of the silver film is much greater than the permeation threshold, a heat treatment process is required to heat the silver film in vacuum for 500 ℃ for 1 hour to obtain discontinuous silver nanoparticles, such as image 3 (a) shown.

[0045] (2) E-beam evaporation of 70 nm SiO on the silver nanoparticle layer 2 The conceptual diagram of the structure of the inverted metamaterial superabsorber formed by the isolation layer and the 200 nm continuous silver film is shown in image 3 (b) is shown in the inset.

[0046] (3) image 3 (b) is the measured optical absorption spectrum. The results show that the three-layer structure achieves more than 70% optical superabsorption from visible light...

Embodiment 3

[0047] Embodiment 3: glass substrate / continuous silver film / al 2 o 3 Dielectric layer / primary silver nanoparticle layer / secondary silver nanoparticle layer

[0048] (1) With the glass substrate as the substrate, a flat and continuous Ag film with a thickness of 300 nm is plated in a magnetron sputtering device, and 90 nm Al is evaporated with an electron beam on top of it. 2 o 3 membrane.

[0049] (2) In Ag / Al 2 o 3 Continue to sputter a silver film with a nominal thickness of 16 nm on the film. Since the thickness is greater than the permeation threshold of the silver material, the sample needs to undergo a vacuum heat treatment process at 200 ° C for one hour, so that the initial morphology of the top-layer connected silver film is successfully transformed into Silver nanoparticles separated from each other.

[0050] (3) On the basis of the structure prepared by the initial coating, continue to sputter a silver film with a nominal thickness of 4 nm. Since this th...

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Abstract

The invention belongs to the technical field of micro-nano photonics and bioanalytical chemistry and particularly relates to a surface-enhanced raman scattering base on the basis of special-material superabsorbers and a preparation method thereof. The surface-enhanced raman scattering base is an optical special-material superabsorber with a three-layer structure on a substrate, and the three-layer structure comprises a continuous metal film layer, a medium isolating layer and a discontinuous metal film layer; the discontinuous metal film layer is composed of metal particle arrays at nano feature size and mutual separated. The base is prepared through a film-plating and heat-treatment technology, and a coupling micronano antenna having controllable overall shape and appearance and taking the metal particle arrays as the top layer is prepared at low cost in a large area, so that ultra-wide spectrum optical absorbing performance is realized. The preparation method has the advantages of simple operation, good repeatability and low cost. The surface-enhanced raman scattering substrate has the very important application to the fields of food inspection, environmental supervision, medical detection and chemical and biological analysis and the like.

Description

technical field [0001] The invention belongs to the technical fields of micro-nano photonics and bioanalytical chemistry, and in particular relates to a surface-enhanced Raman scattering substrate based on a metamaterial superabsorber and a preparation method thereof. Background technique [0002] Raman scattering spectroscopy involves a technology based on scattering spectroscopy to obtain molecular vibration and rotation information in the sample to be tested. Its notable features include non-destructive, contact-free, and label-free. As a molecular-level material structure detection method, Raman scattering spectroscopy has crucial applications in food inspection, environmental supervision, medical detection, chemical and biological analysis and other fields. An important technical bottleneck of Raman scattering spectroscopy is the small Raman scattering cross-section of the molecules to be measured, resulting in weak scattering signals and low sensitivity, making it impo...

Claims

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Application Information

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IPC IPC(8): G01N21/65
Inventor 甘巧强江素华张楠刘恺宋昊旻曾勰纪登鑫
Owner FUDAN UNIV
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