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Preparation method of flexible composite SERS (Surface Enhanced Raman Scattering) substrate based on expanded graphite

A technology of expanded graphite and composite substrate is applied in the field of preparation of flexible composite SERS substrate, which can solve the problems of glass slide substrate peak interference and complicated process, and achieve the effects of Raman signal enhancement, simple process and low cost.

Pending Publication Date: 2022-04-05
HEBEI NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Chinese patent CN202010707325.9 proposes a flexible SERS substrate based on a bead array and its preparation method, but the preparation process involves the transfer of the bead array from a hard substrate to a flexible substrate, and the process is cumbersome
Chinese patent CN202010133719.8 reports a method for preparing a substrate material that directly redoxes the surface of a flexible film substrate to obtain nano-silver in situ, but this material will have interference caused by the substrate peak of the glass slide in the detection application

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  • Preparation method of flexible composite SERS (Surface Enhanced Raman Scattering) substrate based on expanded graphite
  • Preparation method of flexible composite SERS (Surface Enhanced Raman Scattering) substrate based on expanded graphite
  • Preparation method of flexible composite SERS (Surface Enhanced Raman Scattering) substrate based on expanded graphite

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Embodiment 1

[0029] A preparation method of a flexible composite SERS substrate based on expanded graphite, comprising the steps of:

[0030] Step 1. Put 0.01g of expanded graphite in 20mL of water, and the ultrasonic dispersion time is 200min to fully disperse the expanded graphite;

[0031] Step 2, passing the dispersed expanded graphite solution through a filter device, and evenly loading it on a filter membrane with a diameter of 25 mm and a pore size of 0.22 μm;

[0032] Step 3. Dry the above-mentioned expanded graphite flexible substrate at 25°C, and its flexibility is as follows: figure 1 shown;

[0033] Step 4, the gold nano sol prepared by Lee&Meisal chemical reduction is centrifugally cleaned, concentrated, and drop-coated onto the surface of the dry flexible expanded graphite substrate;

[0034] Step 5, placing the flexible expanded graphite composite substrate in a pH=7 solution;

[0035] Step 6, placing the flexible expanded graphite composite substrate at T=20° C. for heat...

Embodiment 2

[0039] A preparation method of a flexible composite SERS substrate based on expanded graphite, comprising the steps of:

[0040] Step 1. Put 0.01g of expanded graphite in 20mL of water, and the ultrasonic dispersion time is 200min to fully disperse the expanded graphite;

[0041] Step 2, passing the dispersed expanded graphite solution through a filter device, and evenly loading it on a filter membrane with a diameter of 25 mm and a pore size of 0.45 μm;

[0042] Step 3, drying the above-mentioned expanded graphite flexible substrate at 20°C;

[0043] Step 4. The gold nanorod sol synthesized by the seed method is centrifugally cleaned, concentrated, and drip-coated on the surface of the dry flexible expanded graphite substrate. Its microscopic appearance is as follows: figure 2 shown;

[0044] Step 5, placing the flexible expanded graphite composite substrate in a pH=10 solution;

[0045] Step 6, placing the flexible expanded graphite composite substrate at T=30° C. for he...

Embodiment 3

[0049] A preparation method of a flexible composite SERS substrate based on expanded graphite, comprising the steps of:

[0050] Step 1, put 0.01g of expanded graphite in 20mL of water, and the ultrasonic dispersion time is 200min, so that the expanded graphite can be fully dispersed; Step 2, pass the dispersed expanded graphite solution through the filter device, and evenly load it on on the membrane;

[0051] Step 3, drying the above-mentioned expanded graphite flexible substrate at 20°C;

[0052] Step 4, the gold nanorod sol synthesized by the seed method is centrifugally cleaned, concentrated, and drip-coated on the surface of the dry flexible expanded graphite substrate;

[0053] Step 5, placing the flexible expanded graphite composite substrate in a pH=10 solution;

[0054] Step 6, placing the flexible expanded graphite composite substrate at T=100° C. for heat treatment for 30 minutes.

[0055] A surface-enhanced Raman spectroscopy detection experiment based on a fle...

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Abstract

The invention discloses a preparation method of a flexible composite SERS (Surface Enhanced Raman Scattering) substrate based on expanded graphite. Ultrasonically dispersing expanded graphite, and uniformly loading the expanded graphite on a flexible film through a liquid filtering device; the surface of the expanded graphite has a hydrophobic property, so that the noble metal nanoparticles dispensed on the surface of the expanded graphite can be effectively assembled into an active hot spot area through water evaporation, and the Raman signal intensity is enhanced. The substrate can be suitable for different curved surfaces, can still keep good stability under extreme treatment conditions including a certain pH value and temperature range, and can realize sensitive detection of trace triphenylmethane pollutants and pesticide residues. In addition, the flexible substrate material is simple in preparation process, low in cost and suitable for commercial application.

Description

technical field [0001] The invention belongs to the field of material technology, in particular to a preparation method of a flexible composite SERS substrate based on expanded graphite. Background technique [0002] Surface-enhanced Raman spectroscopy (SERS), as a simple, rapid and highly sensitive analytical method, has been widely used in detection and characterization in various fields. Among them, gold and silver are the most common reinforcing substrate materials, and gold nanorods have received a lot of attention due to their unique optical tunable properties. In the prior art, for example, Chinese patent CN201811325248.X provides a new type of cationic surfactant as a coating agent to prepare gold nanorods, and uses electrostatic adsorption to improve the sensitivity of SERS to detect pigment molecules. Chinese patent CN202010707325.9 proposes a flexible SERS substrate based on a bead array and its preparation method, but the preparation process involves the transfe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/225B22F1/054B22F9/02
Inventor 于博荣李江丽王焦锁毛越张慧姣
Owner HEBEI NORMAL UNIV
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