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Core-shell-structure silver-gold nanosheet based on epitaxial growth and preparation method and application thereof

An epitaxial growth, silver nanosheet technology, applied in the field of nanomaterials, can solve the problems of displacement reaction, complex process, long preparation period, etc., and achieve the effects of short period, simple preparation method, and simple and easy preparation process

Active Publication Date: 2015-11-04
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these methods still have deficiencies, such as long preparation cycle, complex process, and replacement reactions.

Method used

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  • Core-shell-structure silver-gold nanosheet based on epitaxial growth and preparation method and application thereof
  • Core-shell-structure silver-gold nanosheet based on epitaxial growth and preparation method and application thereof
  • Core-shell-structure silver-gold nanosheet based on epitaxial growth and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] (1) Add silver nitrate to water so that its molar concentration is 1×10 -4 mol / L, then add trisodium citrate, hydrogen peroxide, and then quickly add sodium borohydride aqueous solution, the molar ratio of silver nitrate, trisodium citrate, hydrogen peroxide, and sodium borohydride is 1:45:240:6, stir for 0.5h, A solution of silver nanosheets was obtained. The ultraviolet-visible-near-infrared absorption peak of the silver nanosheet solution is 600 nm, and the average size of the silver nanosheets in the silver nanosheet solution is 30 nm.

[0041] (2) Prepare a gold precursor solution. Add chloroauric acid, ligand (sodium sulfite), and pH regulator (sodium hydroxide) into water so that the concentration of chloroauric acid is 1.25×10 -3 mol / L, the molar ratio of chloroauric acid to the ligand is 1:3, the pH value of the solution is 10, and it is allowed to stand at 25° C. for 12 hours to obtain a gold precursor solution.

[0042] (3) Preparation of core-shell struct...

Embodiment 2

[0045] (1) Add silver nitrate to water so that its molar concentration is 1×10 -4 mol / L, then add trisodium citrate, hydrogen peroxide, then quickly add sodium borohydride aqueous solution, the molar ratio of silver nitrate, trisodium citrate, hydrogen peroxide, sodium borohydride is 1:80:350:18, stir for 2h, get Silver nanosheet solution.

[0046] (2) Prepare a gold precursor solution. Add chloroauric acid, ligand (sodium sulfite), and pH regulator (sodium hydroxide) into water so that the concentration of chloroauric acid is 5×10 -4 mol / L, the molar ratio of chloroauric acid to the ligand is 1:3, the pH value of the solution is 12, and it is allowed to stand at 30° C. for 8 hours to obtain a gold precursor solution.

[0047] (3) Preparation of core-shell structured silver-gold nanosheets. The precursor concentration of configuring gold is 5×10 -4 mol / L aqueous solution, add surfactant (polyvinylpyrrolidone), reducing agent (ascorbic acid), acetonitrile, make the molar ra...

Embodiment 3

[0050] (1) Add silver nitrate to water so that its molar concentration is 1×10 -4 mol / L, then add trisodium citrate, hydrogen peroxide, then quickly add sodium borohydride aqueous solution, the molar ratio of silver nitrate, trisodium citrate, hydrogen peroxide, sodium borohydride is 1:60:300:10, stir for 1h, get Silver nanosheet solution.

[0051] (2) Prepare a gold precursor solution. Add chloroauric acid, ligand (sodium sulfite), and pH regulator (potassium hydroxide) into water so that the concentration of chloroauric acid is 5×10 -3 mol / L, the molar ratio of chloroauric acid to the ligand is 1:5, the pH of the solution is 10, and the solution is allowed to stand at 25° C. for 8 hours to obtain a gold precursor solution.

[0052] (3) Preparation of core-shell structured silver-gold nanosheets. The precursor concentration of configuring gold is 1×10 -3 mol / L aqueous solution, add surfactant (polyvinylpyrrolidone), reducing agent (ascorbic acid), and ligand, so that the ...

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Abstract

The invention provides a core-shell-structure silver-gold nanosheet based on epitaxial growth and a preparation method and application thereof. The method includes the steps that firstly, a silver nanosheet solution is prepared, then, chloroauric acid and ligand react in the alkaline environment, and a gold precursor solution is obtained; and a reducing agent, surfactant, a pH modifier, ligand or acetonitrile and the silver nanosheet solution are added to the gold precursor solution, and the core-shell-structure silver-gold nanosheet is obtained after the reaction. The ligand and chloroauric acid radial can generate coordination, a gold precursor is formed, the redox potential of gold is reduced, and the replacement reaction is prevented from being generated; the gold precursor is reduced into gold atoms through the reducing agent, the gold atoms are deposited on the surface layer of a silver nanosheet in an epitaxial growth mode, and the core-shell-structure silver-gold nanosheet is formed. The preparation process is simple and feasible; the shape and the size of the core-shell-structure silver-gold nanosheet are controllable; the excellent stability and the good optical property are achieved; wide application prospects are achieved in the fields of molecular detection and the like.

Description

technical field [0001] The invention belongs to the technical field of nanomaterials, and in particular relates to a silver-gold nanosheet with a core-shell structure based on epitaxial growth and a preparation method and application thereof. Background technique [0002] Gold and silver have excellent optical properties, which are derived from their unique surface plasmon resonance properties, and they are widely used in many fields, such as surface plasmon enhanced Raman, surface plasmon resonance enhanced fluorescence, photothermal therapy, Bioimaging, catalysis and other fields. The position of the surface plasmon resonance absorption peak of anisotropic gold and silver nanosheets can be adjusted to the near-infrared region, which is very important for the application of gold and silver in the biological field, because in this spectral range biological tissues, blood And water has minimal absorption of light. [0003] Scientists prepared silver nanosheets in 2001. Afte...

Claims

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Application Information

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IPC IPC(8): B22F9/24B22F1/02C30B19/00C30B29/02G01N21/65B82Y30/00B82Y40/00
Inventor 高传博刘红坡殷亚东
Owner XI AN JIAOTONG UNIV
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