Preparation method of nano tin dioxide/carbon basis point/nano silver surface-enhanced Raman substrate

A nano-tin dioxide, surface-enhanced Raman technology, applied in Raman scattering, measuring devices, instruments, etc., can solve the problems of affecting chemical enhancement effect, weakening the electromagnetic enhancement effect of materials, etc., to broaden the range of materials used and product stability. The effect of good sex and simple operation

Inactive Publication Date: 2019-07-19
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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  • Preparation method of nano tin dioxide/carbon basis point/nano silver surface-enhanced Raman substrate
  • Preparation method of nano tin dioxide/carbon basis point/nano silver surface-enhanced Raman substrate
  • Preparation method of nano tin dioxide/carbon basis point/nano silver surface-enhanced Raman substrate

Examples

Experimental program
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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 solid 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.

[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 gluc...

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 3~4 h, centrifuge at 3000 rpm for 10 min, collect the supernatant, and then centrifuge the collected supernatant at 12000 rpm for 10 min, and repeat the centrifugation for 5 times until the supernatant is clear. The obtained precipitate was dissolved in 10 mL of secondary water, which was the carbon-based dot-coated tin dioxide nanosheet composite material, and 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 in...

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Abstract

The invention discloses a preparation method of a nano tin dioxide / carbon basis point / nano silver surface-enhanced Raman substrate. Nano tin dioxide / carbon basis point nanomaterial and nano silver aredissolved in water, weak aqua ammonia is added under the condition of stirring to adjust pH to be alkalescent and then a reducing agent glucose is further added, and thus a nano tin dioxide / carbon basis point / nano silver composite material can be prepared. The preparation method provided by the invention is simple, convenient and pollution-free, and has a swift response and extremely strong operability. Carbon basis points on the surface of the acquired nano tin dioxide / carbon basis point / nano silver composite material have a lot of oxygen-containing functional groups, so that the compositematerial has good dispersibility in water. The composite material serving as the more excellent surface-enhanced Raman substrate has the electromagnetic enhancement effect included by noble metal nano particles, and the composite semiconductor material has the certain chemical enhancement effect, and meanwhile the carbon material on the surface of the composite material can adsorb benzene seriesvia electrostatic adsorption and pi-pi interaction, so that the composite material can be applied to 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 Applications(China)
IPC IPC(8): G01N21/65
CPCG01N21/658
Inventor 董永强付凤富王茜
Owner FUZHOU UNIV
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