Surface enhancement Raman scattering (SERS) substrate and preparation method of same

A surface-enhanced Raman and substrate technology, used in Raman scattering, liquid chemical plating, coating, etc., can solve the problems of low Raman scattering signal enhancement effect, complex preparation process, and high cost, and achieve high Raman Scattered signal enhancement effect, simple preparation method, and enhanced enhancement effect

Inactive Publication Date: 2017-08-29
JIANGXI NORMAL UNIV
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Problems solved by technology

The enhancement effect of the first enhanced substrate is relatively low, and the reproducibility of the enhanced signal is poor. This method is also not suitable for the preparation of enhanced substrates in large quantities.
The signal reproducibility of the preparation of the third substrate is very high, and the enhancement effect is also high, but the preparation process uses chemical vapor deposition technology, photolithography technology, electron (ion) beam etching technology, etc., which makes the whole substrate preparation The process is complex and expensive, which limits its practical application
Nevertheless, this type of substrate also has some disadvantages: (1) the spherical gold-silver nanoparticle-reinforced substrate is the easiest to prepare and the most widely used, but its enhancement effect on the Raman scattering signal of molecules is relatively low; (2) ) Enhanced substrates

Method used

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  • Surface enhancement Raman scattering (SERS) substrate and preparation method of same
  • Surface enhancement Raman scattering (SERS) substrate and preparation method of same
  • Surface enhancement Raman scattering (SERS) substrate and preparation method of same

Examples

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Effect test

Embodiment 1

[0031] The preparation process of the surface-enhanced Raman scattering substrate (AuNCA@Ni substrate) is as follows: figure 1 As shown, the specific preparation steps include the following three steps:

[0032] (1) Nickel foam is cut into a square sheet with a length and width of 1 cm, and placed in a small beaker, followed by ultrasonic cleaning with 10 mL of acetone, 10 mL of dilute hydrochloric acid (3mol / L), and 10 mL of ultrapure water for 10 minutes to obtain a clean foam nickel sheet , blow dry with nitrogen for later use.

[0033] (2) Take a 1.5mL plastic centrifuge tube, inject 1mL of 20mg / mL CTAB solution, and then use a micropipette to inject 0.5mL of 24mM HAuCl 4 solution, cover the lid, and mix up and down 10 times (about 5 seconds) to obtain the reaction solution. Open the lid, quickly put in a piece of clean nickel foam, cover the lid and turn it up and down 10 times to mix (about 5 seconds), then let it stand at 20°C for 6 hours.

[0034] (3) After the prev...

Embodiment 2

[0036] Repeat the operation of Example 1, only changing the concentration of the CTAB solution in step (2) from 20 mg / mL to 2 mg / mL.

Embodiment 3

[0038] Repeat the operation of Example 1, only changing the concentration of the CTAB solution in step (2) from 20 mg / mL to 200 mg / mL.

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Abstract

The invention provides a surface enhancement Raman scattering (SERS) substrate and a preparation method of same. The SERS substrate employs cetyl trimethyl ammonium bromide (CTAB) as a morphology controlling agent and three-dimensional macroporous foamed nickel as a base material, is prepared through a replacement reaction of chloroauric acid and nickel, and has abundant high-enhancement-activity gold micro-nano conical spike-shaped structures which are uniformly distributed. The preparation method includes the steps of: under the effect of the CTAB, performing a reaction to the chloroauric acid and nickel at 20-30 DEG C for a certain period. The SERS substrate has a unique and uniformly distributed gold micro-nano cone-shaped array structure and a three-dimensional macroporous structure, has high enhancement performance of probe molecule Raman signals and has good repeatability in the enhanced signals. The SERS substrate can be used for high-sensitive surface enhanced Raman spectroscopy detection for dye molecules, such as crystal violet, malachite green, methylene blue and the like in environment. The preparation method is simple, is low in cost, is free of special instrument and has good repeatability.

Description

technical field [0001] The invention relates to the field of chemical analysis and detection, in particular to a surface-enhanced Raman scattering substrate and a preparation method thereof. Background technique [0002] Surface Enhanced Raman Scattering (SERS) is a highly sensitive analysis method, which refers to the Raman scattering of molecules when they are adsorbed on the surface of solids such as gold and silver, especially rough solids (ie substrates). The strength will be greatly enhanced (10 3 -10 6 times or even higher). To achieve this enhancement, a good enhancement substrate is essential. A good enhancement substrate needs to meet several conditions: high enhancement ability, good reproducibility of enhanced signal, and high substrate stability. In addition, low cost, easy preparation, and large-scale preparation are also crucial for the practical application of substrates. In terms of composition, the most effective materials for reinforcement are gold an...

Claims

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Application Information

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IPC IPC(8): C23C18/42G01N21/65
CPCC23C18/1637C23C18/1644C23C18/1683C23C18/42G01N21/658
Inventor 许富刚
Owner JIANGXI NORMAL UNIV
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