Preparation of a carbon-based point-wrapped tin dioxide nanosheet composite and its application in surface-enhanced Raman substrates

A technology of surface-enhanced Raman and composite materials, which is applied in the directions of Raman scattering, material analysis, and material excitation analysis, can solve the problems of limiting the development of noble metal nano-substrates, weak spectral signal reproducibility, and unstable structural properties. Broaden the range of materials used, facilitate mechanism research, and have good product stability

Inactive Publication Date: 2021-06-22
FUZHOU UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Noble metal nanoparticles are widely used as surface-enhanced Raman substrate materials due to their strong localized surface plasmon resonance effect, but the inhomogeneity and unstable structural properties of metal nanoparticles will lead to weak spectral signal reproducibility and poor biocompatibility. Defects limit the development of noble metal nanosubstrates to some extent
At present, studies have shown that carbon-based dots have a Raman enhancement effect. Compared with ordinary substrates, although the enhancement effect is weak, it has a relatively flat surface, good Raman signal uniformity, and good repeatability. In addition, its surface It often has a large number of hydrophilic groups, such as carboxyl, hydroxyl, etc., to make it hydrophilic

Method used

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  • Preparation of a carbon-based point-wrapped tin dioxide nanosheet composite and its application in surface-enhanced Raman substrates
  • Preparation of a carbon-based point-wrapped tin dioxide nanosheet composite and its application in surface-enhanced Raman substrates
  • Preparation of a carbon-based point-wrapped tin dioxide nanosheet composite and its application in surface-enhanced Raman substrates

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Weigh 1.8 g of single-layer graphene nanosheets with a diameter of <5 nm and dissolve them in 30 mL of water, adjust the pH to 8 with sodium hydroxide, then add 0.6 g of nano-tin dioxide solids to the above solution and mix, and the resulting mixed solution is 300W ~700W ultrasonic for 3~4 h, centrifuge at 3000 rpm for 10 min, collect the supernatant, then centrifuge the collected supernatant at 12000 rpm for 10 min, repeat centrifugation and washing 5 times until the supernatant is clear, the obtained The precipitate was dissolved in 10 mL of secondary water, that is, the carbon-based dot-wrapped tin dioxide nanosheet composite material, and stored in a refrigerator at 4 °C.

Embodiment 2

[0034] Weigh 1.2 g of single-layer graphene nanosheets with a diameter of <5 nm and dissolve them in 30 mL of water, adjust the pH to 8 with sodium hydroxide, then add 0.6 g of nano-tin dioxide solids to the above solution and mix, and the resulting mixed solution is 300W After ~700W ultrasonication for 3~4 h, centrifuge at 3000 rpm for 10 min, collect the supernatant, then centrifuge the collected supernatant at 12000 rpm for 10 min, and repeat the centrifugation and washing for 5 times until the supernatant is clear. The precipitate was dissolved in 10 mL of secondary water, that is, the carbon-based dot-wrapped tin dioxide nanosheet composite material, and stored in a refrigerator at 4 °C.

Embodiment 3

[0036] Weigh 0.6 g of single-layer graphene nanosheets with a diameter of <5 nm and dissolve them in 30 mL of water, adjust the pH to 8 with sodium hydroxide, then add 0.6 g of nanometer tin dioxide solids to the above solution and mix to obtain a mixed solution After ultrasonication at 300W~700W for 3~4h, centrifuge at 3000rpm for 10min, collect the supernatant, then centrifuge the collected supernatant at 12000rpm for 10min, repeat centrifugation and washing 5 times until the supernatant is clear, and the obtained precipitate Dissolved in 10 mL of secondary water, the carbon-based dot-wrapped tin dioxide nanosheet composite material was stored in a refrigerator at 4 °C.

[0037] figure 1 Transmission electron microscope image of the carbon-based dot-wrapped tin dioxide nanosheet composite prepared in Example 3. It can be seen from the figure that the prepared carbon-based dot-wrapped tin dioxide nanosheets are flakes with a size of about 20-50 nm, and the nanosheets are sur...

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Abstract

The invention discloses a preparation of a carbon-based dot-wrapped tin dioxide nanosheet composite material and its application in a surface-enhanced Raman substrate. Nanoparticles are mixed and ultrasonicated, using the ultra-thin structure of the single-layer carbon-based dots as an intercalation agent to peel off the tin dioxide nanoparticles into nanosheets, and using the abundant oxygen-containing functional groups on the surface of the single-layer carbon-based dots to combine with the two SnO nanosheets are combined to obtain SnO2 nanosheets wrapped by carbon-based dots. The preparation method of the present invention is simple and convenient, pollution-free and highly operable, and the obtained carbon-based dot-wrapped tin dioxide nanosheet composite material has good dispersibility and stability in water, and can be used for selective detection of certain environmental pollutants .

Description

technical field [0001] The invention belongs to the field of preparation of surface-enhanced Raman substrates, and in particular relates to the preparation of a carbon-based point-wrapped tin dioxide nanosheet composite material and its application in surface-enhanced Raman substrates. Background technique [0002] Surface-enhanced Raman scattering has the advantages of high sensitivity, fast detection speed, little interference, and basically no damage to the test sample. At the same time, it can effectively avoid interference from impurities, so that it can provide more accurate fingerprint information of the sample to be tested. At present, surface-enhanced Raman scattering has broad application prospects in various fields such as surface science, biology, food safety, medical identification, and catalysis. The main research directions of surface-enhanced Raman include the preparation of substrates, the study of mechanisms, and analytical applications. However, their app...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/65
CPCG01N21/658
Inventor 董永强付凤富王茜
Owner FUZHOU UNIV
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