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A preparation method of au-ag alloy nanoparticles with tunable plasmon resonance

An alloy nanoparticle, plasmon resonance technology, applied in nanotechnology and other directions, can solve the problems of low extinction coefficient, easy oxidation, difficulty, etc., and achieve the effect of good biocompatibility

Active Publication Date: 2021-11-16
SHIHEZI UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Ag nanoparticles have a high extinction cross-sectional area. However, factors such as easy oxidation and instability limit many applications. Au nanoparticles have extremely high stability. However, compared with Ag nanoparticles, the extinction coefficient is lower, and it is desirable to It is more difficult to absorb light below 500nm with Au nanoparticles

Method used

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  • A preparation method of au-ag alloy nanoparticles with tunable plasmon resonance
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Experimental program
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Embodiment 1

[0020] Synthesis of silver nanoparticles:

[0021] a. Preparation of silver seed solution: Take a 250mL round bottom flask, add 20mL 1wt% sodium citrate aqueous solution and 75mL water, stir in an oil bath at 70°C for 15min, then add 1.7mL 1wt% AgNO 3 aqueous solution, stirred vigorously, and quickly added 0.1 wt% freshly reconstituted NaBH 4 solution, stirred vigorously at 70°C for 1 hour, cooled naturally to room temperature, added water to make it up to 100mL, and obtained a solution of silver nano-seeds;

[0022] b. Growth of silver seeds: Add 1mL of sodium citrate solution to a 100mL beaker, add 75mL of water, boil for 15min, add 5mL of silver nanoseeds obtained in step a, stir vigorously, then quickly add 0.85mL of 1wt% AgNO 3 The solution was stirred for 1 h under boiling, the obtained solution was naturally cooled to room temperature, centrifuged and washed, and the centrate was dispersed in the aqueous solution to obtain 10 nm spherical silver nanoparticles;

[0023...

Embodiment 2

[0026] Synthesis of silver nanoparticles:

[0027] a. Preparation of silver seed solution: Take a 250mL round bottom flask, add 20mL 1wt% sodium citrate aqueous solution and 75mL water, stir in an oil bath at 70°C for 15min, then add 1.7mL 1wt% AgNO 3 aqueous solution, stirred vigorously, and quickly added 0.1 wt% freshly reconstituted NaBH 4 solution, stirred vigorously at 70°C for 1 hour, cooled naturally to room temperature, added water to make it up to 100mL, and obtained a solution of silver nano-seeds;

[0028] b. Growth of silver seeds: Add 1mL of sodium citrate solution to a 100mL beaker, add 75mL of water, boil for 15min, add 5mL of silver nanoseeds obtained in step a, stir vigorously, then quickly add 0.85mL of 1wt% AgNO 3 solution, stirred for 1 h under boiling, and repeated 1 time to add 1 mL of sodium citrate solution to the solution, followed by rapid addition of 0.85 mL of 1wt% AgNO 3 solution, stirring for 1 h under boiling, naturally cooling the final obtain...

Embodiment 3

[0032] Synthesis of silver nanoparticles:

[0033] a. Preparation of silver seed solution: Take a 250mL round bottom flask, add 20mL 1wt% sodium citrate aqueous solution and 75mL water, stir for 15min under a temperature of 70°C in an oil bath, then add 1.7mL 1wt% AgNO3 aqueous solution, stir vigorously, and quickly Add 0.1 wt% freshly configured NaBH 4 solution, stirred vigorously at 70°C for 1 hour, cooled naturally to room temperature, added water to make it up to 100mL, and obtained a solution of silver nano-seeds;

[0034] b. Growth of silver seeds: Add 1mL of sodium citrate solution to a 100mL beaker, add 75mL of water, boil for 15min, add 5mL of silver nanoseeds obtained in step a, stir vigorously, then quickly add 0.85mL of 1wt% AgNO 3 solution, stirred for 1 h under boiling, and repeated 4 times to add 1 mL of sodium citrate solution to the solution, followed by rapid addition of 0.85 mL of 1 wt% AgNO 3 solution, stirring for 1 h under boiling, naturally cooling the...

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Abstract

The invention relates to a method for preparing Au-Ag alloy nanoparticles with tunable plasmon resonance. The method uses spherical Ag nanoparticles as a reaction template, 4 After sodium citrate was added to the solution, the synthesized Ag nanoparticles were added to obtain Au-Ag alloy nanoparticles with tunable plasmon resonance; hollow Au-Ag alloys with different cavity sizes were prepared by controlling the reaction time Nanoparticles, controllable plasmon resonance peaks of Au-Ag alloy nanoparticles, the plasmon resonance-tunable Au-Ag alloy nanoparticles prepared by this method are from solid Ag nanoparticles to hollow Au ‑Ag alloy nanoparticles transformation, and then a process of transformation to solid Au‑Ag alloy nanoparticles. The method has the advantages of simplicity, rapidity, low cost, controllable process, and good repeatability, and can be used in various fields of solar cells, photocatalysis, biomedicine, and optical sensing.

Description

technical field [0001] The invention relates to a preparation method of Au-Ag alloy nanoparticles with adjustable plasmon resonance, which can be used for solar cells, photocatalysis, biomedicine, optical sensing and the like. Background technique [0002] Surface Plasmon Resonance (SPR) effect has been widely used in solar light harvesting, photocatalysis, biomedicine and optical sensing due to its unique light-matter interaction characteristics. The SPR effect is due to the collective oscillation effect of valence electrons on the surface of metals (Au, Ag, Cu, Al, etc.) under the action of a certain external field (such as light). After these nanoparticles absorb light of a specific frequency, the SPR effect is excited, and plasmon decay occurs, transferring the accumulated energy to the electrons in the conduction band of the material. In the field of energy research, due to its unique optical properties, localized surface plasmon metal nanoparticles can effectively use...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F9/24B82Y40/00
Inventor 侯娟岳宣宇刘威言沈劲松解一君张淑文邵培源陆耀耀
Owner SHIHEZI UNIVERSITY
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