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A kind of preparation method of Raman enhanced substrate

A substrate and Raman technology, applied in Raman scattering, material excitation analysis, etc., can solve the problem of poor Raman enhancement effect on copper surface, and achieve low cost effect

Active Publication Date: 2020-07-21
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The present invention proposes a method for preparing a Raman-enhanced substrate for the problem of poor Raman enhancement effect on the copper surface proposed in the background technology

Method used

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  • A kind of preparation method of Raman enhanced substrate
  • A kind of preparation method of Raman enhanced substrate
  • A kind of preparation method of Raman enhanced substrate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] A method for preparing a Raman enhanced substrate, comprising the following steps:

[0030] Step 1: Add 21mg of copper chloride dihydrate, 50mg of glucose and 90mg of cetylamine into 10mL of deionized water, stir and mix for 10min to obtain a precursor solution;

[0031] Step 2: Put the aluminum sheet into the precursor solution prepared in step 1, and stir for 3-10 hours until a uniform blue colloid is formed, and a small amount of free copper ions undergoes a displacement reaction with aluminum to form a seed crystal;

[0032] Step 3: Transfer the colloid prepared in step 2 to an 85°C oil bath for reaction, and the color of the colloid gradually changes from blue to brown. Because the surface energy of aluminum is smaller than that of the newly synthesized copper nanoparticles, coupled with the influence of seed crystals, The newly synthesized copper nanoparticles tend to attach to aluminum, and after 6 hours of reaction deposition, aluminum flakes with copper attache...

Embodiment 2

[0037] Compared with Example 1 in this example: the quality of hexadecylamine is 180 mg, and the remaining parameters and steps are the same as in Example 1.

[0038] figure 1 (b) is the surface morphology of the Raman-enhanced substrate obtained in Example 2, indicating that the surface of the Raman-enhanced substrate obtained in Example 2 is a rod-shaped structure, about 5 μm long and about 1 μm wide. Due to the lightning rod effect, surface plasmons will gather in the The rod-shaped tip part, and this structure with a large aspect ratio is conducive to the transmission of charges, so that the electromagnetic field strength in this area increases sharply, thereby enhancing the Raman signal.

[0039] figure 2 It is an optical image of a water droplet on the Raman-enhanced substrate obtained in Example 2; its contact angle is about 146.3°, which shows the good hydrophobicity of the substrate, which is conducive to improving the Raman signal intensity.

[0040] image 3 The...

Embodiment 3

[0043] Compared with Example 1 in this example: the mass of hexadecylamine is 240 mg, and the remaining parameters and steps are the same as in Example 1.

[0044] figure 1 (c) is the surface morphology of the Raman-enhanced substrate obtained in Example 3, showing that the Raman-enhanced substrate obtained in Example 3 presents clusters composed of irregular rods and petals, and the gap between these clusters can be very good The surface plasmon is confined in this region, so it has a better Raman enhancement effect.

[0045] image 3 The Raman enhancement curve of the sample iii obtained in Example 3 shows (in order to facilitate observation, the curve ordinate is enlarged 20 times), the peak position of the curve and the laser Raman spectrum of 4-mercaptobenzoic acid Figure 1 To, of which, 1590cm -1 The peak Raman intensity at is 20489counts, and the Raman enhancement factor is calculated, and the enhancement factor is 0.26×10 6 ,like image 3 (b, iii) shown.

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Abstract

The invention discloses a method for preparing a Raman enhanced substrate, which belongs to the technical field of preparation of functional materials. The method comprises the following steps: 1) adding soluble copper salt, reducing agent and surfactant into deionized water, and mixing uniformly to obtain a precursor solution; 2) putting the metal sheet into the precursor solution in the previous step, stirring for 3-10 hours, After mixing evenly, react at a temperature of 80-120° C. for 1-6 hours; 3) take out the metal sheet, wash it with ethanol and deionized water, and dry it; the Raman-enhanced substrate can be obtained. The Raman-enhanced substrate obtained by the method of the present invention has the advantages of simple process, obvious Raman enhancement effect, good chemical stability, low cost, etc., and can realize the preparation of corresponding morphology according to actual application requirements by controlling the concentration of surfactant. The substrates with different Raman enhancement effects are obtained, which can be widely used in the fields of electrochemistry, bioanalysis, sensing, food safety and so on.

Description

technical field [0001] The invention belongs to the technical field of preparation of new functional materials, and in particular relates to a method for preparing a substrate with a Raman enhancement effect. Background technique [0002] Raman spectroscopy is a research method that collects and analyzes the inelastic scattering spectrum generated after excitation by incident light, obtains molecular vibration and other information through the frequency shift of scattered light, and applies it to molecular structure analysis and characterization. In the 1970s, Fleischman et al. first discovered that the Raman signal of molecules on the rough silver surface was greatly enhanced. This phenomenon is called surface-enhanced Raman scattering (Surface-enhanced Raman Scattering, referred to as SERS). Surface Raman enhanced spectroscopy can well reflect the characteristic structure of the molecule itself, and has the advantages of high sensitivity, non-destructive to samples, and ea...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/65
Inventor 熊杰邓敏饶高峰黄建文邬春阳李岚
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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