Preparation method of silver nanoring

A technology of silver nanometer and silver nitrate, applied in the field of preparation of silver nanorings, can solve the problems of rough preparation method, low yield, no detailed research, etc., and achieve the effects of unique scattering focusing effect, low cost and simple process

Inactive Publication Date: 2012-09-12
WUHAN UNIV
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Problems solved by technology

[0007] Advanced Functional Materials magazine published an article entitled "Illuminating Dark Plasmons of Silver Nanoantenna Rings to Enhance Exciton–Plasmon Interactions" in January 2009 (the author is the inventor), which introduced a chemically synthesized silver The method of nanorings, the prepared silver nanorings have a good ring structure, but the preparation method is rough, and there is no detailed study on the influence of parameters such as solution concentration, ratio, temperature, stirring speed on the reaction product during the reaction process, and the lack of silver nanorings. The size and yield control of nanorings lead to uneven size and low yield of synthesized silver nanorings

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preparation example Construction

[0026] Silver nano ring preparation method of the present invention, comprises the following steps:

[0027] (1) Heat ethylene glycol at high temperature for a period of time;

[0028] (2) Under the condition of stirring and heating, slowly add silver nitrate, polyvinylpyrrolidone and sodium bromide into the ethylene glycol heated at high temperature in a certain proportion;

[0029] (3) The solution continues to stir and heat for a certain period of time;

[0030] (4) After the reaction, the reaction product was centrifuged and washed with alcohol or acetone to obtain silver nanorings.

[0031] The heating temperature of the above-mentioned ethylene glycol is 150-190 degrees. Before adding other reactants, the ethylene glycol needs to be heated for a period of time. The heating time is 5 minutes to 1 hour. A specific scheme of the present invention is to heat for 1 hour. It can be stirred or not stirred during the early heating process. In the early heating process, ethyle...

Embodiment 1

[0039] 1. Weigh 48 mg of polyvinylpyrrolidone and 48 mg of silver nitrate; 2. Dissolve polyvinylpyrrolidone and silver nitrate in 3 mL of anhydrous ethylene glycol, and add 68 mg of polyvinylpyrrolidone-ethylene glycol solution μg of sodium bromide; 3. Add 5 mL of ethylene glycol to the three-mouthed sesame cake and heat it to 160 °C; 4. Mix polyvinylpyrrolidone-ethylene glycol solution and silver nitrate-ethylene glycol solution at a temperature of 160 °C Add dropwise at a rate of 0.5 mL / min from two ports of the three-port sesame cake, and stir at a rate of 1000 r / min until the reaction solution turns khaki, then take out the reaction solution, cool to room temperature, and centrifuge with ethanol to wash. The ethanol was collected to obtain a solution containing silver nanorings.

Embodiment 2

[0041] 1. Weigh 32 mg of polyvinylpyrrolidone and 48 mg of silver nitrate; 2. Dissolve polyvinylpyrrolidone and silver nitrate in 3 mL of anhydrous ethylene glycol, and add 45 mg of polyvinylpyrrolidone-ethylene glycol solution μg of sodium bromide; 3. Add 5 mL of ethylene glycol to the three-mouthed sesame cake and heat it to 150 °C; 4. Mix polyvinylpyrrolidone-ethylene glycol solution and silver nitrate-ethylene glycol solution at a temperature of 150 °C Add dropwise at a rate of 0.1 mL / min from two ports of the three-ported sesame cake, and stir at a rate of 600 r / min until the reaction solution turns khaki, then take out the reaction solution, cool to room temperature, and centrifuge with ethanol to wash. The ethanol was collected to obtain a solution containing silver nanorings.

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Abstract

The invention relates to a preparation method of a silver nanoring. The preparation method comprises the following steps of: adopting a high-temperature stirring heating method, taking ethylene glycol as a solvent and reducing agent, taking polyvinylpyrrolidone as a surface protectant, and performing centrifugal cleaning on a reaction product to obtain a silver nanoring solution, wherein the prepared silver nanoring has a perfect circular and smooth surface and an oval section, the diameter of the ring is of 4-20mu m, the line thickness of the section of the ring is 50-200nm, and the whole silver nanoring is of a secondary twin structure. The method has the characteristics of simple process and low cost, the prepared silver nanoring has a smooth surface and an excellent crystal structure, and the silver nanoring can be used in the fields of optical nano-cavities, nano-photoelectric devices and the like.

Description

technical field [0001] [0002] The invention relates to the technical field of preparation of metal nanostructure materials, in particular to a method for preparing silver nanorings. [0003] Background technique [0004] With the rapid development of nanoscience, metal nanomaterials, especially noble metal gold and silver nanocrystals, have been widely used in nano-optoelectronics, biochemical sensing, biomedical imaging, surface enhancement, etc. Raman scattering, catalysis and other fields. [0005] Metal nanoparticles have a unique surface plasmon (surface plasmon) property, and its surface plasmon resonance properties depend on many factors such as the composition, shape, size, and environmental medium of its material. Therefore, the preparation of metal nanostructures , especially the size- and shape-controllable preparation has received extensive attention. There are two main ways to prepare gold and silver nanoparticles: top-down physical methods, including phot...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/24
Inventor 周利龚红梅王取泉
Owner WUHAN UNIV
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