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Surface enhanced raman scattering activity nanometer porous metal substrate and method for making same

A surface-enhanced Raman and nanoporous technology, used in Raman scattering, material excitation analysis, etc., can solve the problems of signal reproducibility, poor stability, short storage time, and complicated preparation, and achieve good substrate stability and cost. Low, reproducible effects

Inactive Publication Date: 2008-07-09
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, the most widely used reinforcement substrates are silver or gold sol particles, which have a strong surface enhancement effect, but the substrate obtained by this method also has poor signal reproducibility, poor stability, short storage time, and complicated preparation. Disadvantages such as higher cost

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  • Surface enhanced raman scattering activity nanometer porous metal substrate and method for making same
  • Surface enhanced raman scattering activity nanometer porous metal substrate and method for making same

Examples

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preparation example Construction

[0027] The preparation method of the nanoporous metal copper substrate with surface-enhanced Raman scattering activity proposed by the present invention comprises the following steps:

[0028] (1) Ultrasonic dispersion of spherical nickel phosphate colloidal particles prepared by a uniform precipitation method in absolute ethanol to obtain a stable suspension.

[0029] (2) Put a conductive substrate (such as a silicon wafer sputtered with Pt on the surface) into the above-mentioned colloidal particle suspension as the cathode, use a graphite electrode as the anode, apply a 20-30V DC voltage between the electrodes, and electrophoretically deposit it on the cathode substrate. Obtain a uniformly coated colloidal deposition film; or place a conductive substrate (such as a silicon wafer sputtered with Pt on the surface) obliquely into the above-mentioned colloidal particle suspension, the conductive surface and the liquid surface form an angle of 40-50 degrees, at 60 ° C The solven...

Embodiment 1

[0040] (1) Ultrasonic dispersion of spherical nickel phosphate colloid particles with a diameter of 100±30 nm prepared by a uniform precipitation method in absolute ethanol to obtain a stable suspension.

[0041](2) Put the silicon chip sputtered with Pt on the surface into the above-mentioned colloidal particle suspension as the cathode, use the graphite electrode as the anode, apply a 20V DC voltage between the electrodes, energize for 10 minutes, and obtain a uniform coating by electrophoretic deposition on the cathode substrate colloidal deposition film.

[0042] (3) Dry the above-mentioned colloidal deposition film together with the substrate, put it into a heating furnace, and heat-treat it in air at 200° C. for 2 hours to obtain a template layer on the conductive substrate.

[0043] (4) Put the above-mentioned template together with the substrate into the metal electroplating solution as the cathode, the electroplating solution is a citric acid-tartaric acid copper plat...

Embodiment 2

[0046] (1) Ultrasonic dispersion of spherical nickel phosphate colloid particles with a diameter of 150±50 nm prepared by a uniform precipitation method in absolute ethanol to obtain a stable suspension.

[0047] (2) Put the silicon chip sputtered with Pt on the surface into the above-mentioned colloidal particle suspension as the cathode, use the graphite electrode as the anode, apply a 30V DC voltage between the electrodes, and electrophoretically deposit it on the cathode substrate for 5 minutes to obtain a uniform coating. Colloidal deposition film.

[0048] (3) Dry the above-mentioned colloidal deposited film together with the substrate, put it into a heating furnace, and heat-treat it in air at 250° C. for 1 hour to obtain a template layer on the conductive substrate.

[0049] (4) Put the above-mentioned template together with the substrate into the metal electroplating solution as the cathode, the electroplating solution is a citric acid-tartaric acid copper plating sol...

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Abstract

The invention relates to a surface-enhanced Raman scattering nanometer porous metal substrate and a preparation method thereof, which belong to the field of laser Raman spectral detection technology. The nanometer porous metal substrate has a three-dimensional irregular through-hole structure with a spherical cavity with a diameter about 80 to 500 nm and a granular protrusion structure with a size of 5 to 20 nm on the inner wall of the cavity. The preparation method of the template of the nanometer porous metal substrate comprises the following steps of: suspension and dispersion of a spherical template agent; preparation and thermal-treatment of the template; electro-deposition to fill metal in the template; and removing the template to obtain the nanometer porous metal substrate. The substrate obtained by the invention has excellent surface enhanced effect, high repeatability, good substrate stability, lower technical cost and convenient operation control, and can be stored in the air for above two months.

Description

technical field [0001] The invention belongs to the technical field of laser Raman spectrum detection, and relates to a nanoporous metal substrate with surface-enhanced Raman scattering activity, good stability, and suitable for long-term storage and a preparation method thereof. Background technique [0002] As a common method for analyzing molecular vibrational spectra, laser Raman technology has been widely used in the detection of minerals, gemstones, pharmaceuticals, food additives, chemical reagents, identification of molecular structures of substances, and analysis of surface binding states. However, the Raman scattering effect signal is often very weak. When the concentration of the molecules to be measured is small, or when the surface adsorbed substances are detected, the conventional laser Raman method is insufficient, and auxiliary enhancement methods are needed. [0003] Surface-enhanced Raman scattering (SERS) is a Raman-enhancing effect. When molecules with r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/65
Inventor 潘伟韩若冰
Owner TSINGHUA UNIV
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