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A preparation method of nano-tin dioxide/carbon base point/nano-silver surface-enhanced Raman substrate

A nano-tin dioxide, surface-enhanced Raman technology, applied in Raman scattering, material excitation analysis, instruments, etc., can solve the problems of weakening the electromagnetic enhancement effect of materials and affecting the chemical enhancement effect, so as to broaden the range of materials used and products The effect of good stability and simple operation of the preparation method

Inactive Publication Date: 2021-05-18
FUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although chemical enhancement is weaker than physical enhancement, it cannot be ignored. The chemical enhancement mechanism is more due to the interaction between the adsorbate and the substrate.
At present, various researchers focus on preparing surface-enhanced Raman substrate materials with both physical and chemical enhancement effects. Most of them deposit noble metal nanoparticles on the surface of semiconductors or wrap noble metal nanoparticles with semiconductors to obtain composite materials for surface-enhanced Raman. However, encapsulating noble metal nanoparticles with semiconductor materials will weaken the electromagnetic enhancement effect of the material, and the deposition of noble metal nanoparticles on the semiconductor will also affect its chemical enhancement effect

Method used

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  • A preparation method of nano-tin dioxide/carbon base point/nano-silver surface-enhanced Raman substrate
  • A preparation method of nano-tin dioxide/carbon base point/nano-silver surface-enhanced Raman substrate
  • A preparation method of nano-tin dioxide/carbon base point/nano-silver surface-enhanced Raman substrate

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.

[0033]Take 1 mL of 5.5 mg / mL nano-tin dioxide / carbon based dot composite material solution and 50 mg of silver nitrate and stir and dissolve in 50 mL of deionized water, add dilute ammonia water to adjust the pH of the solution to 8, then heat the solution to 60 °C and add 100 mg of glucose, the ...

Embodiment 2

[0035] 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 ~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.

[0036] Take 1 mL of 5.5 mg / mL nano-tin dioxide / carbon dot composite solution and 10 mg of silver nitrate and dissolve them in 50 mL of deionized water, add dilute ammonia water to adjust the pH of the solution to 8, then heat the solution to 70 °C and add 30 mg of glucose, the solution instantly ...

Embodiment 3

[0038] 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.

[0039] Take 1 mL of 5.5 mg / mL nano-tin dioxide / carbon dot composite solution and 30 mg of silver nitrate and dissolve them in 50 mL of deionized water, add dilute ammonia water to adjust the pH of the solution to 8, then heat the solution to 80 °C and add 80 mg of glucose, the solution instantly turned milk...

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Abstract

The invention discloses a preparation method of a nano-tin dioxide / carbon base point / nano-silver surface-enhanced Raman substrate. The nano-tin dioxide / carbon base point nanomaterial and silver ions are dissolved in water, and dilute ammonia water is added in a stirring state to adjust the pH Add the reducing agent glucose after being weakly alkaline, and then the nano-tin dioxide / carbon base point / nano-silver composite material can be prepared. The preparation method of the invention is simple and convenient, has no pollution, and has rapid response and strong operability. The obtained nano-tin dioxide / carbon base point / nano-silver composite material has good dispersibility in water because the surface carbon base point has a large number of oxygen-containing functional groups. As a more excellent surface-enhanced Raman substrate, the composite material not only has the electromagnetic enhancement effect of noble metal nanoparticles, but also the compound semiconductor material has a certain chemical enhancement effect. Adsorption of benzene series can be used for surface-enhanced Raman detection.

Description

technical field [0001] The invention belongs to the field of preparation of a surface-enhanced Raman substrate, and relates to a method for preparing a nano-tin dioxide / carbon basis point / nano-silver surface-enhanced Raman substrate. Background technique [0002] Surface-enhanced Raman spectroscopy was discovered by Fleischmann et al. on the surface of rough silver electrodes in 1974. As a novel detection technology, it overcomes the weak signal of Raman spectroscopy and can provide unique vibration fingerprint information of analytes. It is suitable for For non-destructive testing and in-situ testing, it can provide structural information of the analyte molecule at the molecular level. Surface-enhanced Raman spectroscopy has not only been used for trace detection and monitoring of various organisms and compounds, but also has been widely used in environmental monitoring, surface science, analytical science, material science and other fields. Current research on surface-enh...

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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