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Gold-silver core shell nano thorns and preparation method and application thereof

A nanothorn and gold nanotechnology, applied in the direction of nanotechnology, nanotechnology, metal processing equipment, etc., can solve the problems of not being able to obtain a highly active SERS substrate, enhance the SERS effect, etc., and achieve the effect of facilitating industrial production and simple preparation methods

Active Publication Date: 2017-09-15
HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this product can be used in the field of photoelectric devices and biomedicine, there are deficiencies in both the preparation method and the visible-near-infrared absorbance peak of the product. The plasmon absorption peak can also excite the surface plasmon absorption in the near-infrared band, and it can also have a stronger electromagnetic field-enhanced SERS effect; secondly, the preparation method cannot obtain a highly active SERS substrate with a wider band

Method used

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  • Gold-silver core shell nano thorns and preparation method and application thereof
  • Gold-silver core shell nano thorns and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] The concrete steps of preparation are:

[0045] Step 1, first according to the volume ratio of water, 0.15g / L gold nanosphere aqueous solution, 105g / L chloroauric acid aqueous solution and 8g / L hydroquinone aqueous solution is the ratio of 30:0.1:0.12:8, the The aqueous solution of gold nanospheres, the aqueous solution of chloroauric acid and the aqueous solution of hydroquinone were sequentially added into the stirred water and reacted for 1 min; wherein, the stirring rate was 400 r / min to obtain the aqueous solution of gold nanothorns. Carry out the treatment of solid-liquid separation and washing to gold nano thorn aqueous solution again; Wherein, the treatment of solid-liquid separation is centrifugation, and its rotating speed is 8000r / min, and time is 7min, and the treatment of washing is to use ethanol to separate the solid matter that obtains. Cleaning, separating the solid matter during cleaning is centrifugal separation to obtain gold nano thorns.

[0046] S...

Embodiment 2

[0049] The concrete steps of preparation are:

[0050] Step 1, first according to the volume ratio of water, 0.18g / L gold nanosphere aqueous solution, 103g / L chloroauric acid aqueous solution and 9g / L hydroquinone aqueous solution is the ratio of 30:0.3:1.1:9, the The gold nanosphere aqueous solution, the chloroauric acid aqueous solution and the hydroquinone aqueous solution were sequentially added into the stirred water for 1.3 minutes to react; wherein, the stirring rate was 450 r / min to obtain the gold nanothorn aqueous solution. Carry out the treatment of solid-liquid separation and washing to gold nano thorn aqueous solution again; Wherein, the treatment of solid-liquid separation is centrifugation, and its rotating speed is 8500r / min, time is 6.5min, and the treatment of washing is to use ethanol to separate the solid matter that obtains Cleaning is carried out, and the separation of solid matter during cleaning is centrifugation to obtain gold nanothorns.

[0051] Ste...

Embodiment 3

[0054] The concrete steps of preparation are:

[0055] Step 1, first according to the volume ratio of water, 0.2g / L gold nanosphere aqueous solution, 100g / L chloroauric acid aqueous solution and 10g / L hydroquinone aqueous solution is the ratio of 30:0.45:1:10, the The aqueous solution of gold nanospheres, the aqueous solution of chloroauric acid and the aqueous solution of hydroquinone were sequentially added into the stirred water for 1.5 minutes to react; wherein, the stirring rate was 500 r / min to obtain the aqueous solution of gold nanothorns. Carry out the treatment of solid-liquid separation and washing to gold nano thorn aqueous solution again; Wherein, the treatment of solid-liquid separation is centrifugation, and its rotating speed is 9000r / min, and time is 6min, and the treatment of washing is to use ethanol to separate the solid matter obtained. Cleaning, separating the solid matter during cleaning is centrifugal separation to obtain gold nano thorns.

[0056] Ste...

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Abstract

The invention discloses gold-silver core shell nano thorns and a preparation method and application thereof. The nano thorns are formed in the mode that silver nano shell layers with the thicknesses being 2-10 nm cover gold nano thorns, wherein the gold nano thorns are formed in the mode that gold thorns are vertically arranged on the surfaces of gold nano balls, and each gold thorn is in a frustum shape with the top diameter being 8-12 nm, the bottom diameter being 18-22 nm and the height being 15-20 nm. The method comprises the steps that a gold nano ball aqueous solution, a chloroauric acid aqueous solution and a hydroquinone aqueous solution are sequentially added into water under stirring to react and then subjected to solid-liquid separation and washing treatment, and the gold nano thorns are obtained; a polyvinyl pyrrolidone pentanediol solution and gold nano thorn pentanediol dispersion liquid are added into pentanediol under stirring, and then a silver nitrate pentanediol solution are added into the pentanediol to react; and next, the reaction liquid are subjected to solid-liquid separation and washing treatment and then dispersed in ethyl alcohol or water, and the target products are prepared. The gold-silver core shell nano thorns can serve as an SERS active substrate, and the content of organic matters attached on the gold-silver core shell nano thorns is measured through a laser Raman spectrometer.

Description

technical field [0001] The present invention relates to a nano thorn and its preparation method and application, in particular to a gold-silver core-shell nano thorn and its preparation method and application. Background technique [0002] Noble metal nanostructures have unique optical properties of surface plasmons, and have broad application prospects in the fields of imaging, biodiagnosis, surface plasmon photocatalysis, and surface-enhanced Raman scattering (SERS) detection. At present, people have made some useful attempts and efforts to obtain noble metal nanostructures with the optical properties of surface plasmons, such as "Self-Assembly Mechanism of Spiky Magnetoplasmonic Supraparticles", Adv.Funct.Mater.2014, 24, 1439-1448 (“Self-assembly Mechanism of Spiny Magnetic Surface Plasmon Superstructures”, Journal of Advanced Functional Materials, Vol. 24, pp. 1439-1448, 2014). The spiny magnetic surface plasmon superstructure mentioned in this article is a core-shell s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F1/02B22F9/24B82Y40/00B82Y30/00
CPCB82Y30/00B82Y40/00B22F9/24B22F1/0553B22F1/054B22F1/17
Inventor 黄竹林孟国文柯岩周宏建
Owner HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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