SERS substrate based on metal chloride nano-film and preparation method

A nano-film and chloride technology, applied in Raman scattering, material excitation analysis, etc., can solve the problems of low SERS detection sensitivity and high detection limit concentration, and achieve excellent sensitivity, orderly and controllable morphology, and high repeatability. Effect

Inactive Publication Date: 2015-11-25
NORTHWEST UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Based on the problems existing in the prior art, the present invention provides a SERS substrate and a preparation method based on a metal chloride nano-film, which solves the technical problems of low SERS detection sensitivity and high detection limit concentration in the prior art

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  • SERS substrate based on metal chloride nano-film and preparation method
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  • SERS substrate based on metal chloride nano-film and preparation method

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Embodiment 1

[0040] This embodiment provides a method for preparing a SERS substrate based on a metal chloride nanofilm, comprising the following steps:

[0041] Step 1: Using the secondary anodic oxidation method, for the high-purity (99.99%) metal aluminum film, use the oxalic acid solution with a concentration of 0.3mol / L, the temperature is 5°C, the voltage is 40V, and the oxidation is 3h to prepare an oxidation film with an ordered and regular structure. Aluminum template, the ordered regular structure is nanopores distributed in an array;

[0042] Step 2: Take the alumina template with an ordered and regular structure and a nanopore structure distributed in an array as the substrate, and drop CuCl with a concentration of 47 mg / L on the upper surface 2 solution.

[0043] Step 3: Seal the sample, store it in a closed environment at 15°C for 240h, and obtain CuCl based on alumina substrate through self-organization 2 nano film material. The alumina-based CuCl 2 The area of ​​the nan...

Embodiment 2

[0052] This embodiment provides a method for preparing a SERS substrate based on a metal chloride nanofilm, comprising the following steps:

[0053] Step 1: Using the secondary anodic oxidation method, for the high-purity (99.99%) metal aluminum film, use the oxalic acid solution with a concentration of 0.3mol / L, the temperature is 5°C, the voltage is 40V, and the oxidation is 3h to prepare an oxidation film with an ordered and regular structure. Aluminum template, the ordered regular structure is nanopores distributed in an array;

[0054] Step 2: Take the alumina template with an ordered and regular structure and a nanopore structure distributed in an array as the substrate, and drop CuCl with a concentration of 20 mg / L on the upper surface 2 solution.

[0055] Step 3: Seal the sample, store it in a closed environment at 10°C for 280h, and obtain CuCl based on alumina substrate through self-organization 2 nano film material. The alumina-based CuCl 2 The area of ​​the nan...

Embodiment 3

[0058] This embodiment provides a method for preparing a SERS substrate based on a metal chloride nanofilm, comprising the following steps:

[0059] Step 1: Using the secondary anodic oxidation method, for the high-purity (99.99%) metal aluminum film, use the oxalic acid solution with a concentration of 0.3mol / L, the temperature is 5°C, the voltage is 40V, and the oxidation is 3h to prepare an oxidation film with an ordered and regular structure. Aluminum template, the ordered regular structure is nanopores distributed in an array;

[0060] Step 2: Take the alumina template with an ordered and regular structure and a nanopore structure distributed in an array as the substrate, and drop CuCl with a concentration of 100 mg / L on the upper surface 2 solution.

[0061] Step 3: Seal the sample, store it in a closed environment at 35°C for 150h, and obtain CuCl based on alumina substrate through self-organization 2 nano film material. The alumina-based CuCl 2 The area of ​​the na...

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Abstract

The invention provides a SERS substrate based on a metal chloride nano-film and a preparation method. The method comprises the steps of taking porous anodized aluminum as a substrate, dripping metal chloride aqueous solutions on the substrate, obtaining the metal chloride nano-film under the preservation condition of sealing or semi-sealing at the normal temperature, and plating a layer of metal film on the metal chloride nano-film. According to the method, by conducting simple improvement on an AAO form board, the flower-like multi-layer composite type SERS active substrate is obtained, the substrate is orderly and controllable in contour, high in repeatability, uniform in hot spot, stable in performance, capable of growing on a large area, better than an Au-AAO substrate in sensitivity, lower than the Au-AAO substrate in detection limit concentration, simple and convenient in preparation process, high in efficiency, low in cost and suitable for lot-size preparation, and an effective and novel approach of lot-size preparation is provided for preparation and scientific research of application of the SERS substrate.

Description

technical field [0001] The invention belongs to the technical field of surface nanometer materials and relates to a SERS substrate, in particular to a SERS substrate based on a metal chloride nano film and a preparation method. Background technique [0002] Surface-enhanced Raman scattering (Surface-enhanced Ramanscattering, SERS) phenomenon was first discovered by the British Fleishmann research group in 1974. Its huge Raman signal enhancement combined with spectral fingerprint identification features attracted the attention of researchers in various fields. Ten years ago, it has developed into an ultra-sensitive spectroscopic technique that can reach single-molecule detection level and is suitable for low-concentration detection. It has great application potential in biology, diagnostics, medicine, materials science, environmental science and analytical science. [0003] Since the advent of SERS technology, research in related fields has mainly focused on the preparation o...

Claims

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Application Information

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IPC IPC(8): G01N21/65
Inventor王凯歌隋超璠任军营武建国王爽张琛白晋涛
OwnerNORTHWEST UNIV