Gold/silver/polymer/silver nanoplate core-shell material and preparation method thereof

A technology of silver nanosheets and core-shell nanomaterials, which is applied in the field of gold/silver/polymer/silver nanosheet core-shell materials and their preparation, can solve the problem of weak SERS signal, easy oxidation of precious metal nanomaterials, and practical problems of precious metal nanomaterials. Application restrictions and other issues

Active Publication Date: 2017-09-22
深圳市格仕乐科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the SERS signal of isolated noble metal nanoparticles is usually too weak to be used for single-molecule detection due to the lack of nanogap in them.
Meanwhile, the efficiency and reliability of SERS nanoprobes are often compromised by ligand dissociation or exchange
Moreover, noble metal nanomaterials exposed to the air are easily oxidized, and it is difficult to use them to make long-term and stable SERS substrates.
Therefore, the practical applications of these noble metal nanomaterials are severely limited

Method used

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  • Gold/silver/polymer/silver nanoplate core-shell material and preparation method thereof
  • Gold/silver/polymer/silver nanoplate core-shell material and preparation method thereof
  • Gold/silver/polymer/silver nanoplate core-shell material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] The preparation method of core-shell silver nano triangular sheet material comprises the following steps:

[0031] 1. Preparation of gold nano-nucleus: 75 milliliters of chloroauric acid aqueous solution (concentration is 10 mg per milliliter) is heated to 100 degrees, and after the temperature stabilizes, add 1200 microliters of sodium citrate aqueous solution (concentration is 10 milligrams per milliliter) while vigorously stirring. ), after 20 minutes of reaction, the precipitate was collected after centrifugation, and the gold nano-nucleus was obtained;

[0032] 2. Preparation of gold / silver core-shell nanomaterials: Take all the gold nano-cores prepared in step 1), and quickly add 16 microliters of 4-mercaptobenzoic acid solution (concentration: 0.00057 mmol per milliliter) while vigorously stirring at room temperature ) and 16 microliters of sodium hydroxide solution (concentration of 0.25 mmol per milliliter), after standing for 2 hours, 20 microliters of hydrazi...

Embodiment 2

[0044] The preparation method of core-shell silver nano triangular sheet material comprises the following steps:

[0045] 1. Preparation of gold nanonuclei: Heat 50 milliliters of chloroauric acid aqueous solution (concentration of 10 mg per milliliter) to 100 degrees, and add 750-1500 microliters of sodium citrate aqueous solution (concentration of 10 mg per milliliter) while stirring vigorously after the temperature stabilizes. per milliliter), after 20 minutes of reaction, the precipitate was collected after centrifugation, and the gold nano-nucleus was obtained.

[0046] 2. Preparation of gold / silver core-shell nanomaterials: Take all the gold nano-cores prepared in step 1), and quickly add 8 microliters of 4-mercaptobenzoic acid solution (concentration: 0.00057 mmol per milliliter) while vigorously stirring at room temperature ) and 8 microliters of sodium hydroxide solution (concentration of 0.25 mmol per milliliter), after standing for 2 hours, 10 microliters of hydrazi...

Embodiment 3

[0054] The preparation method of core-shell silver nano triangular sheet material comprises the following steps:

[0055] 1. Preparation of gold nano-nuclei: 100 milliliters of chloroauric acid aqueous solution (concentration is 10 mg per milliliter) is heated to 100 degrees, and after the temperature stabilizes, add 1500 microliters of sodium citrate aqueous solution (concentration is 10 milligrams per milliliter) while vigorously stirring ), after 20 minutes of reaction, the precipitate was collected after centrifugation, and the gold nano-nucleus was obtained;

[0056] 2. Preparation of gold / silver core-shell nanomaterials: take the gold nano-core prepared in step 1), and quickly add 24 microliters of 4-mercaptobenzoic acid solution (concentration: 0.00057 mmol per milliliter) at room temperature while vigorously stirring and 24 microliters of sodium hydroxide solution (concentration of 0.25 mmol per milliliter), after standing for 2 hours, 30 microliters of hydrazine hydra...

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Abstract

The invention discloses a gold / silver / polymer / silver nanoplate core-shell material and a preparation method thereof. The gold / silver / polymer / silver nanoplate core-shell material and the preparation method thereof have the characteristics that the core-shell nano material comprises a gold nano core, a second silver layer, a third polymer layer and a silver shell sequentially; the core is a gold nanoparticle with the particle diameter of 30-60 nanometers; the second layer is the silver layer with the thickness of 5-20 nanometers; the third layer is the polystyrene polyacrylic acid segmented copolymer layer with the thickness of 10-15 nanometers; the outermost layer is the silver nanoplate shell layer with the particle diameter of 350-500 nanometers; and the material is prepared through a seed inducement method, is of a novel four-layer core-shell structure and has the advantages that under the action of external exciting light, an intercoupling effect can be generated between surface local electromagnetic fields generated by the four layers, SERS signal output with very high intensity is generated, and preparation process is simple, the period is short, yield is high, and popularization and large-scale production are easy.

Description

technical field [0001] The invention relates to the fields of material engineering and nanotechnology, in particular to a gold / silver / polymer / silver nanosheet core-shell material and a preparation method thereof. Background technique [0002] Over the past two decades, surface-enhanced Raman scattering (SERS) technology has developed into an efficient analytical detection method in the fields of life healthcare, environmental monitoring, and food safety due to its single-molecule-level sensitivity. Among various SERS materials, the optical properties of noble metal nanomaterials, especially the surface plasmon resonance absorption spectrum, strongly depend on their structure and morphology. Therefore, noble metal nanoparticles with various morphologies, such as spherical, cubic, rod, biconical, and sea urchin, have been synthesized by using a variety of surfactants and using different wet chemical methods. By changing the structure and morphology of these noble metal nanoma...

Claims

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Application Information

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IPC IPC(8): B22F1/02B22F9/24B82Y40/00
CPCB82Y40/00B22F9/24B22F1/07B22F1/16
Inventor 姜涛
Owner 深圳市格仕乐科技有限公司
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