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Preparation method of carbon-based quantum dot/nano-silver surface enhanced raman base

A surface-enhanced Raman and carbon-based quantum dot technology, applied in Raman scattering, measurement devices, instruments, etc., to achieve the effects of strong Raman signal, uniform size, and good stability

Inactive Publication Date: 2016-03-30
FUZHOU UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are few studies on the application of carbon-based quantum dots to surface-enhanced Raman

Method used

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  • Preparation method of carbon-based quantum dot/nano-silver surface enhanced raman base
  • Preparation method of carbon-based quantum dot/nano-silver surface enhanced raman base
  • Preparation method of carbon-based quantum dot/nano-silver surface enhanced raman base

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Experimental program
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Effect test

Embodiment 1

[0023] Weigh 20 mg of carbon-based quantum dots and 60 mg of silver nitrate and dissolve them in 50 mL of deionized water, then add 20 mg of sodium borohydride, the solution instantly turns black and viscous, and continues to stir for 30 minutes. After stopping the reaction, take out the solution in the beaker, centrifuge at a centrifugal force of 13000g for 5min, and repeat centrifugation and cleaning 5 times until the centrifugation supernatant is clear; Materials; store in the refrigerator at 4°C, away from light.

Embodiment 2

[0025] Weigh 200 mg of carbon-based quantum dots and 6 mg of silver nitrate and dissolve them in 50 mL of deionized water, then add 0.2 mg of sodium borohydride, the solution instantly turns black and viscous, and continues to stir for 5 hours. After stopping the reaction, take out the solution in the beaker, centrifuge for 30min under the centrifugal force of 7000g, and repeat the centrifugation and washing for 5 times until the centrifugation supernatant is clear. The obtained precipitate was dissolved in 10 mL of twice-distilled water to obtain a carbon-based quantum dot / nano-silver composite material. Store in the refrigerator at 4°C, away from light.

Embodiment 3

[0028] figure 1 Scanning electron micrograph (a) and transmission electron micrograph (b) of the prepared carbon-based quantum dots / nanosilver composite. figure 1 It shows that the silver nanoparticles prepared by this method are surrounded by a layer of carbon-based quantum dots with a thickness of about 1 to 2 nm, and the average particle size is about 20 nm.

[0029] figure 2 The ultraviolet absorption peak of the carbon-based quantum dot / nano-silver composite material prepared for this method (a is the ultraviolet absorption peak of the carbon-based quantum dot; b is the ultraviolet absorption peak of the composite material itself; c is the ultraviolet absorption peak of the silver nanoparticle) . From figure 2 It can be seen that compared with carbon-based quantum dots and silver nanoparticles, the ultraviolet absorption peak of the carbon-based quantum dot / nano-silver composite material has a broad ultraviolet absorption peak between 320nm and 500nm. Combined w...

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Abstract

The invention discloses a preparation method of a carbon-based quantum dot / nano-silver surface enhanced raman base. The preparation method comprises the following steps: dissolving carbon-based quantum dots and silver ions in a water solution; adding sodium boro-hydride serving as a reducing agent under a stirring state, so as to prepare a carbon-based quantum dot / nano-silver composite material. The preparation method is simple, convenient, easy, free of pollution, fast in reaction, and high in operability. As the carbon-based quantum dots on the surface of the carbon-based quantum dot / nano-silver composite material comprise a large quantity of oxygen-containing functional groups, the carbon-based quantum dot / nano-silver composite material is favorable in dispersity and long-lasting in stability in water. More importantly, as the carbon-based quantum dot / nano-silver composite material comprises a large quantity of 'notches', the surface enhanced raman activity is excellent; as the carbon material on the surface of the carbon-based quantum dot / nano-silver composite material can adsorb benzene series via electrostatic adsorption and Pi-Pi function, the carbon-based quantum dot / nano-silver surface enhanced raman base can be applied to surface enhanced raman detection of the benzene series.

Description

Technical field [0001] The present invention is a field of preparation of Raman base on the surface, a carbon -based quantum dot / nano -silver surface to enhance Raman base preparation method. Background technique [0002] The surface enhancement Raman spectrum is a hotspot of analyzing chemistry at this stage. It not only has extremely high detection sensitivity, strong selectivity, suitable for non -destructive detection and micro -zone and in -situ detection, but also can give relevant substances at the molecular level.Structure information.At present, the surface enhancement Raman technology is mainly used to study the surface phenomenon related to adsorbing molecules to determine the type of adsorption molecules; determine the orientation of adsorbing molecules on the base surface; study the surface reactions of adsorbing molecules and the co -adsorption of research molecules.Therefore, its application areas are extended from basic research to analytical science, materials sc...

Claims

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Application Information

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IPC IPC(8): G01N21/65
CPCG01N21/658
Inventor 董永强池毓务万利斯
Owner FUZHOU UNIVERSITY
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