Gold-silver core-shell nanothorns, 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 and enhance the SERS effect, and achieve the effect of broadening the SERS detection band and improving the SERS activity

Active Publication Date: 2019-06-11
HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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 nanothorns, preparation method and application thereof
  • Gold-silver core-shell nanothorns, 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 a gold-silver core-shell nano thorn, a preparation method and application thereof. The surface of the gold nanothorn is coated with a silver nanoshell layer with a thickness of 2-10nm. Among them, the gold nanothorn is a gold nanosphere with vertical gold spines on the surface, and the gold spines have a top diameter of 8-12nm and a bottom diameter of 18-22nm. , a frustum of 15-20nm in height; the method is to first add gold nanosphere aqueous solution, chloroauric acid aqueous solution and hydroquinone aqueous solution to the water under stirring for reaction, and then carry out solid-liquid separation and washing treatment to it, After obtaining the gold nanothorn, the polyvinylpyrrolidone pentylene glycol solution and the gold nano thorn pentylene glycol dispersion were added to the stirred pentylene glycol, and the silver nitrate pentylene glycol solution was added to react, and then, the reaction The liquid is subjected to solid-liquid separation and washing treatment, and then dispersed in ethanol or water to obtain the target product. It can be used as a SERS active substrate, and the content of organic matter attached to it can be measured using 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 Patents(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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