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A liquid-phase nano-infrared spectrum plasmon resonance enhanced substrate and its preparation method and application

A technology of plasmon resonance and infrared spectroscopy, which is applied in the field of super-resolution spectroscopy, can solve problems such as the lack of plasmon structure construction schemes, and achieve the effects of easy operation, reduced absorption, and expanded application range

Active Publication Date: 2022-05-17
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, at this stage, there is no construction scheme and application of plasmonic structures that can be applied to the study of liquid-phase nano-infrared spectroscopy.

Method used

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  • A liquid-phase nano-infrared spectrum plasmon resonance enhanced substrate and its preparation method and application
  • A liquid-phase nano-infrared spectrum plasmon resonance enhanced substrate and its preparation method and application
  • A liquid-phase nano-infrared spectrum plasmon resonance enhanced substrate and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0060] 1) Self-assembly of polystyrene microspheres: ultrasonically clean the silicon wafer substrate with ethanol, and set aside after cleaning. Clean the polyethylene container with deionized water and ethanol successively, and dry it before use. Fill the container with deionized water. Place a silicon wafer (thickness: 0.3mm) transparent in the visible-infrared region directly below the liquid surface to raise it. When the water surface is stable, drop polystyrene microspheres (diameter: 3 μm) solution in the center of the container to self-assemble at the gas-liquid interface. After the monolayer of polystyrene microspheres arranged in an orderly and close manner has been prepared, stop adding the polystyrene microsphere solution dropwise and let it stand for 5 minutes. Transfer the self-assembled monolayer of polystyrene microspheres to the visible-infrared region transparent silicon wafer directly below, and move to a flat place, wait for the solvent to evaporate natur...

Embodiment 2

[0063] The preparation method of this example is the same as in Example 1, wherein the diameter of the polystyrene microspheres in step 1 is adjusted to 5 μm, and the metal species in step 2 is adjusted to silver and copper. Under the same conditions, the same is obtained on the surface of the optical wafer. Large-area and highly ordered metal nanostructure arrays, whose morphology is as attached Figure 4 shown separately.

Embodiment 3

[0065] The preparation method of this example is the same as that of Example 1, wherein the diameters of the polystyrene microspheres in step 1 are adjusted to 4 μm and 5 μm, and under the same conditions, large-area and highly ordered gold nanostructures are also obtained on the surface of the optical wafer. array, which looks like the attached Figure 5 shown separately.

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Abstract

The invention relates to a plasmon resonance enhanced substrate used for liquid-phase nano-infrared spectroscopy. It specifically relates to a method of preparing a large-area highly regular and ordered metal structure array on the surface of an optical wafer transparent in the visible-infrared region by using physical deposition technology and its application in liquid-phase nano-infrared spectroscopy. In the present invention, the microspheres are self-assembled at the gas / liquid interface in the container, and then deposited on the surface of the optical wafer transparent in the visible-infrared region, and the metal nano-film material is prepared on the surface of the optical wafer by physical deposition technology, and the microsphere film is removed. , a large-area, highly regular and orderly metal structure array can be obtained on the surface of an optical wafer transparent in the visible-infrared region; the enhanced substrate prepared based on this scheme can realize liquid phase through its plasmon resonance excitation in the mid-infrared region In the analysis of nanoscale infrared spectroscopy, the detection sensitivity can reach the level of monomolecular layer, which is much higher than that of the commonly used total internal reflection prism enhanced substrate. Therefore, it can be used as a new type of high-performance liquid-phase nano-infrared spectroscopy substrate.

Description

technical field [0001] The invention relates to a plasmon resonance enhanced substrate used for liquid-phase nano-infrared spectroscopy, a preparation method and application thereof, and belongs to the field of super-resolution spectroscopy. Background technique [0002] Infrared absorption spectroscopy and its imaging technology are important research methods for analyzing the properties and changes of substances based on the electronic transitions of substances, the interaction of chemical bond vibrations and incident light, and through spectroscopy and imaging. In the infrared spectrum range, the absorption spectrum acquisition and imaging analysis with nanometer-level spatial resolution can be realized, the physical and chemical properties of substances can be studied at the sub-wavelength scale, and the fine structure and functional characteristics and correlations can be revealed. [0003] However, limited by the lack of signal acquisition methods, the research of nano...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C14/14C23C14/04G01N21/01G01N21/3577B82Y40/00B82Y30/00
CPCC23C14/14C23C14/042G01N21/3577G01N21/01B82Y40/00B82Y30/00Y02P70/50
Inventor 夏兴华李剑李今
Owner NANJING UNIV