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Surface-enhanced Raman scattering active substrate and preparation method thereof

A surface-enhanced Raman and active substrate technology, applied in Raman scattering, spinning solution preparation, rayon manufacturing, etc., can solve the problem of limited range of change and achieve the effect of a wide range of wavelengths

Inactive Publication Date: 2012-09-19
SUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For a single gold or silver nanoparticle, the plasmon resonance frequency can be changed by adjusting the size and concentration of the gold / silver nanoparticle or by regrowing the gold / silver core, but the range of change is limited

Method used

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  • Surface-enhanced Raman scattering active substrate and preparation method thereof
  • Surface-enhanced Raman scattering active substrate and preparation method thereof
  • Surface-enhanced Raman scattering active substrate and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Synthesis of Gold-Silver Alloy Nanoparticles

[0026] Add 2.4 g of polyvinyl alcohol (PVA) into 13.6 g of water, slowly raise the temperature to 80°C, heat for 1 hour, the PVA is completely dissolved, and the obtained PVA solution is a colorless, transparent and viscous uniform solution. The mass fraction of the PVA solution is 15%.

[0027] Three different concentrations of PVA solutions with mass fractions of 1%, 5%, and 10% were prepared as solutions for the reduction of gold-silver alloy nanoparticles. In the PVA solutions of different concentrations, HAuCl 4 (2 mmol, 6 mL) and AgNO 3 (2 mmol, 6 mL), then heated to boiling, and then added 5 mL of sodium citrate solution with a mass concentration of 1% (accounting for 0.3 % of the reaction system), and continued to boil for 2 h to obtain a gold-silver alloy nanoparticle / PVA solution , wherein the gold-silver alloy nanoparticles, the molar ratio of gold and silver is 1:1 (denoted as Au 1 Ag 1 ).

[0028] see atta...

Embodiment 2

[0035] Add 2.4 g of polyvinyl alcohol (PVA) into 13.6 g of water, slowly raise the temperature to 80°C, heat for 1 hour, the PVA is completely dissolved, and the obtained PVA solution is a colorless, transparent and viscous uniform solution. The mass fraction of the PVA solution is 15%.

[0036] Add HAuCl configured according to the ratio in Table 1 to the PVA solution with a mass concentration of 1%. 4 (2 mmol) and AgNO 3 (2 mmol), that is, the molar ratios of Au and Ag are 0:1, 1:1, 2:1, 3:1, 1:0; then heated to boiling, and then added 5 mL of 1 % mass concentration Sodium citrate solution (accounting for 0.3% of the reaction system), continued to boil for 2 h to obtain a PVA / Au-Ag nanoparticle solution, and reduced and synthesized alloy nanoparticles with different proportions of Au-Ag, which were successively counted as Ag, Au 1 Ag 1 , Au 2 Ag 1 , Au 3 Ag 1 and Au.

[0037] Table 1

[0038] Nanoparticles HAuCl 4 (2 mmol, mL) AgNO 3 (2 mmol, mL)...

Embodiment 3

[0046] According to embodiment 2 technical scheme, in the PVA solution that mass concentration is 1%, add the HAuCl of configuration simultaneously 4 (2 mmol, 3 mL) and AgNO 3 (2 mmol, 9 mL), then heated to boiling, adding 0.3% sodium citrate solution to the reaction system according to the mass fraction, and continued boiling for 2 h to obtain a colloidal solution of gold-silver alloy nanoparticles, which was reduced to synthesize Au and Ag The molar ratio of alloy nanoparticles is 1:3, counted as Au 1 Ag 3 .

[0047] The prepared Au 1 Ag 3 The alloy nanoparticle colloidal solution was centrifuged three times at 6000 rpm for 25 minutes each time to remove the unreacted metal salt solution; an appropriate amount of 10 wt% PVA solution was added and mixed thoroughly to obtain PVA / Au 1 Ag 3 The PVA concentration in the solution was controlled to be 8 wt%, Au 1 Ag 3 A 4 mmol spinning solution was used for electrospinning.

[0048] A parallel electrospinning device is use...

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Abstract

The invention relates to a surface-enhanced Raman scattering active substrate and a preparation method thereof. A HAuCl4 solution and a AgNO3 solution are added in a polyvinyl alcohol aqueous solution with a certain mass concentration, then sodium citrate is added to prepare a polyvinyl alcohol / Au-Ag alloy nanoparticle spinning solution after sufficient reaction, and a parallel type electrostatic spinning technology is adopted to obtain the surface-enhanced Raman scattering active substrate with a polyvinyl alcohol / Au-Ag alloy nanoparticle composite nanofiber structure, wherein the content of Au-Ag alloy nanoparticles is 2*10<-4> to 2*10<-2> mol / g, and the molar ratio of Au:Ag is (1:2)-(1:3). As gold-silver alloy nanoparticles can absorb light from blue to green and the plasma resonance wavelength can be controlled and adjusted between silver and gold, the applicable wavelength range of the surface-enhanced Raman scattering active substrate material provided by the invention is wider than that of a gold or silver single-component substrate.

Description

technical field [0001] The invention relates to a material for optical measurement and a preparation method thereof, in particular to a surface-enhanced Raman scattering active base material and a preparation method thereof. Background technique [0002] Since Fleischmann found that the Raman signal of pyridine was greatly enhanced on the electrochemically rough silver electrode surface, the specific surface-enhanced optical properties of metal nanoparticles have been highly valued, especially the surface enhancement of gold / silver nanoparticles. Greatly improve the sensitivity of analysis and detection. The surface plasmon resonance generated by the regular movement of free electrons inside gold / silver nanoparticles under the action of an external electromagnetic field of a certain frequency, because the plasmons are confined to a small area, the electric field in this area is greatly enhanced. Using this strong electric field effect, the efficiency of many optical pro...

Claims

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Application Information

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IPC IPC(8): D01F6/50D01F1/10D01D1/02D01D5/00G01N21/65
Inventor 程丝李晓菲范丽娟
Owner SUZHOU UNIV
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