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A cu2o-au composite microparticle surface-enhanced Raman scattering active substrate and its preparation method

A micron particle, cu2o-au technology, applied in the field of nanomaterials, can solve the problems of limited application, weak surface enhanced Raman scattering activity, etc., and achieve the effect of controllable preparation process and mild reaction conditions

Active Publication Date: 2019-03-08
JILIN NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, its weak surface-enhanced Raman scattering activity limits its application in the field of surface-enhanced Raman scattering

Method used

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  • A cu2o-au composite microparticle surface-enhanced Raman scattering active substrate and its preparation method
  • A cu2o-au composite microparticle surface-enhanced Raman scattering active substrate and its preparation method
  • A cu2o-au composite microparticle surface-enhanced Raman scattering active substrate and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] First weigh 0.68g CuSO 4·5H 2 O, 0.87g C 6 h 5 o 7 Na 3 2H 2 O, 0.51g Na 2 CO 3 , 6.00g PVPK30, 1.11g C 6 h 12 o 6 ·H 2 O and 3.00 mL of 1% HAuCl 4 4H 2 O solution.

[0045] CuSO 4 ·5H 2 O was dissolved in 76 mL of deionized water. C 6 h 5 o 7 Na 3 2H 2 O and Na 2 CO 3 Dissolve in 4mL deionized water to make sodium mixed solution.

[0046] Then, the sodium mixed solution was added dropwise to the vigorously stirred CuSO 4 ·5H 2 O solution, the solution turns dark blue. After the dropwise addition, the above mixed solution continued to stir for 10 minutes, and PVP was added to the vigorously stirred solution. After the solution was vigorously stirred for 20 min, PVP was completely dissolved, and C dissolved in 4 mL of deionized water was added dropwise to the solution. 6 h 12 o 6 ·H 2 O.

[0047] After the dropwise addition, the mixed solution was placed in a water bath at 80° C. for 15 minutes, the solution turned brick red, and then the ...

Embodiment 2

[0052] The difference between this embodiment and embodiment 1 is that HAuCl 4 4H 2 The concentration of O was 1%, and the addition amount was 1.00 mL.

[0053] like Figure 7 ~ Figure 9 As shown, in Cu 2 In the O-Au composite microstructure, Cu 2 The edge length of the O-Au composite microstructure is about 1.3 μm, and the diameter of the Au nanoparticles is about 17 nm, which is uniformly deposited on Cu 2 O micron crystals on the surface.

Embodiment 3

[0055] The difference between this example and examples 1 and 2 is that HAuCl 4 4H 2 The concentration of O is 1%, and the addition amount is 5.00 mL.

[0056] Structure Characterization

[0057] like Figure 10 ~ Figure 12 As shown, the formed structure is Cu 2 O-Au core-shell microstructure, Cu 2 The surface of O is all covered by Au nanoparticles, with almost no exposed Cu 2 O surface. Cu 2 The edge length of the O-Au core-shell microstructure is about 1.6 μm, and the diameter of the Au nanoparticles is about 28 nm.

[0058] In the above steps, copper ions (Cu 2+ ) and C 6 h 5 o 7 Na 3 2H 2 O and Na 2 CO 3 reaction, where C 6 h 5 o 7 Na 3 2H 2 O as a chelating agent, and a small amount of Na 2 CO 3 to inhibit C 6 h 5 o 7 Na 3 2H 2 The hydrolysis of O produces copper citrate after the reaction. Copper citrate is reduced by glucose in a water bath at 80°C to produce Cu 2 O crystals. The PVP added during the reaction acts as a stabilizer and plasti...

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Abstract

The invention provides a Cu2O-Au composite microstructure surface enhanced Raman scattering active substrate and a production method thereof. The method comprises the following steps: chelating citrate ions and copper ions, shaping with polyvinylpyrrolidone, and carrying out a reaction under water bath conditions with glucose as a reducing agent to generate Cu2O octahedral crystals; and dispersing the Cu2O octahedral crystals in water, adding a AuCl<4><-> solution, reducing AuCl<4><-> by the Cu2O octahedral crystals to form Au nanoparticles, and carrying out Au nanoparticle in situ deposition on the surface of octahedral Cu2O to reduce the surface energy of a system and generate Cu2O-Au composite microparticles. A Cu2O-Au composite microstructure is designed and synthesized to develop the surface enhanced Raman scattering activity of a semiconductor Cu2O, and local surface plasma resonance of Au aggregate and strong electromagnetic field generated in an interface due to charge transfer between Cu2O and Au are used to improve the surface enhanced Raman scattering activity of the Cu2O-Au composite microstructure.

Description

technical field [0001] The invention belongs to the field of nanometer materials. Background technique [0002] The surface-enhanced Raman scattering effect is due to the phenomenon that when species such as molecules are adsorbed or very close to a surface with a certain nanostructure, their Raman signals are significantly enhanced compared with their bulk molecules. There are two commonly accepted enhancement mechanisms for surface-enhanced Raman scattering: electromagnetic field enhancement and chemical enhancement. As a kind of surface spectroscopy, surface-enhanced Raman scattering technology has the advantages of high selectivity, high sensitivity, non-destructive testing and fixed-point research, and is widely used in surface science, chemical and biological sensing, biomedical detection and trace analysis. detection and other fields. Semiconductor Cu 2 O materials are widely used in catalysis, sensing, and solar energy conversion. However, its weak surface-enhanc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/65
CPCG01N21/658
Inventor 张永军陈雷王雅新赵月
Owner JILIN NORMAL UNIV
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