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Broadband plasmon composite structure and preparation method thereof

A technology of plasmons and composite structures, which is applied in the fields of nanomaterials, optoelectronic materials, and optoelectronics, can solve the problems of low degree of freedom in laser wavelength selection, low sensitivity, uniformity, and low reliability, and achieve good consistency and improved The effect of detection sensitivity and simple process

Active Publication Date: 2020-04-14
NANJING UNIV OF POSTS & TELECOMM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The technical problem to be solved by the present invention is: the existing surface-enhanced Raman substrate has low sensitivity, uniformity and reliability when performing Raman detection, and the degree of freedom of selection of the excitation laser wavelength of the Raman spectrum is not high. high

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  • Broadband plasmon composite structure and preparation method thereof
  • Broadband plasmon composite structure and preparation method thereof
  • Broadband plasmon composite structure and preparation method thereof

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preparation example Construction

[0030] A method for preparing a broadband plasmonic composite structure, comprising the following steps:

[0031] (1) Depositing a metal film or metal nanoparticle layer on the surface of the substrate;

[0032] The substrate is formed from any suitable material, including:

[0033] Insulators: such as glass, quartz, ceramics (such as alumina), etc.;

[0034] Semiconductors: such as silicon, GaN, GaAs, etc.;

[0035] Silicon-on-insulator (SOI);

[0036] Composite material of SOI, silicon and metal.

[0037] The material of metal thin film or metal nano particle layer can be gold, silver, copper, aluminum, alloy or mixture, and described alloy is the alloy that any two or more forms of gold, silver, copper, aluminum, and described mixture is gold, A mixture of two or more of silver, copper, and aluminum.

[0038] The deposition preparation method of metal thin film or metal nanoparticle layer includes physical vapor deposition method, chemical vapor deposition method, atom...

Embodiment 1

[0043] A composite structure for broadband surface-enhanced spectroscopy comprising the steps of:

[0044] (1) Depositing a metal film or metal nanoparticle layer on the surface of the substrate;

[0045] Select quartz glass as the substrate, and then deposit a gold nano-film on the substrate surface by evaporation method, with a film thickness of 1 nanometer.

[0046] (2) The two-dimensional material is transferred to the surface of the gold nanofilm by PMMA-assisted wet method, and the two-dimensional material is a single-layer graphene material;

[0047] (3) High temperature annealing, the annealing temperature is 100°C. After high-temperature annealing, the metal nanofilm or the metal nanoparticle layer grows into a large-sized metal nanoparticle layer, and the size of the metal nanoparticle is 10 nanometers;

[0048] (4) Depositing small-sized gold nanoparticles, the small-sized nanoparticles are prepared by an evaporation method, and the size of the small-sized nanopar...

Embodiment 2

[0050] A method for preparing a broadband plasmonic composite structure, comprising the following steps:

[0051] (1) Depositing a metal film or nanoparticle layer on the surface of the substrate;

[0052] Select quartz glass as the substrate, and then use the evaporation method to deposit silver nano-film on the substrate, with a film thickness of 10 nanometers;

[0053] (2) Transfer the two-dimensional material to the surface of the silver nano film by dry method, and the two-dimensional material is a 2-4 layer graphene material;

[0054] (3) High temperature annealing, the annealing temperature is 350°C. After high-temperature annealing, the metal nanofilm or the metal nanoparticle layer grows into a large-sized metal nanoparticle layer, and the size of the metal nanoparticle is 100 nanometers;

[0055] (4) Depositing small-sized silver nanoparticles, the small-sized nanoparticles are prepared by a gas aggregation method, and the size of the small-sized nanoparticles is 10 ...

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Abstract

The invention discloses a broadband plasmon composite structure and a preparation method thereof, and relates to the field of photoelectric materials and Raman detection. The plasmon composite nano-structure comprises a large-size nano-particle layer, a two-dimensional material layer arranged on the large-size nano-particle layer and small-size nano-particles arranged on the two-dimensional material layer. The preparation method of the broadband plasmon composite structure comprises the following steps: (1) firstly, depositing a metal film or a nano-particle layer on the surface of a substrate; (2) transferring the two-dimensional material to the surface of the prepared metal film or metal particle layer; (3) high-temperature annealing; and (4) deposition of small-size nanoparticles. Therefore, the composite nanostructure is configured into a plasmon resonance structure with a three-dimensional enhanced active site and a broadband enhancement effect, and can be used for detecting a surface enhanced Raman spectrum.

Description

technical field [0001] The invention relates to a broadband plasmon compound structure for surface-enhanced Raman spectroscopy and a preparation method thereof, belonging to the technical fields of nanometer materials, photoelectric materials and photoelectronics. Background technique [0002] Raman spectroscopy belongs to molecular vibration spectroscopy, which can reflect the structural characteristics of molecules, and is vividly called "fingerprint spectrum". However, the Raman scattering effect is extremely weak, and the study of the Raman spectrum of molecules usually requires the use of substrates with Raman enhancement effects, that is, surface-enhanced Raman (SERS) technology. Through the analysis of the Raman spectrum of a substance, information such as its structure and composition can be obtained. Therefore, the enhanced Raman signal is of great significance for substance detection. [0003] Surface-enhanced Raman has the characteristics of high sensitivity and ...

Claims

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Application Information

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IPC IPC(8): G01N21/65B82Y40/00
CPCG01N21/658B82Y40/00
Inventor 毛鹏
Owner NANJING UNIV OF POSTS & TELECOMM
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