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Method for preparing series silver nano-sheets in batch

A silver nanosheet and a series of technologies are applied in the field of preparation of silver nanomaterials, which can solve the problems of small single preparation amount, small reaction amount, increased cost, etc., and achieve a wide range of size regulation, good monodispersity, and simple reaction device. Effect

Inactive Publication Date: 2012-08-15
苏州冷石纳米材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among these reported methods, the light-induced conversion method can realize the continuous adjustment of the size of silver nanosheets, but the main problem it faces is that it needs a special light source and the preparation amount is small, it is difficult to achieve large-scale preparation, and it lacks industrialization prospects.
The solvothermal reaction preparation method is simple, but the reported method cannot realize the continuous regulation of the size of silver nanosheets
The same problem faced by the intermediate induced transformation method is that the single preparation amount is small, so that it can realize industrial production
[0003] In addition, the Chinese patent ZL 200610131640.1 uses a solution-phase synthesis method to synthesize silver nanosheets with adjustable size and thickness at room temperature using sodium borohydride as a reducing agent. The outstanding advantage of this method is that the reaction is simple, but the reduction The agent will release a large amount of hydrogen in an instant, and mass production may cause danger; Chinese patent ZL 200610096565.X discloses a method for synthesizing silver nanosheets at high temperature in a closed reactor. The problem with this method is that the reaction volume is small, which makes The cost of this method increases when it is produced on a large scale

Method used

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  • Method for preparing series silver nano-sheets in batch
  • Method for preparing series silver nano-sheets in batch
  • Method for preparing series silver nano-sheets in batch

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] First prepare 100 ml of mixed solvent of ethylene glycol and dimethylformamide in a volume ratio of 1:1 for later use; then weigh 1 g of polyvinylpyrrolidone (average molecular weight: 33,000) and add it to 50 ml of mixed solvent for stirring or ultrasonic dissolution before adding 6 mg of potassium bromide and 6 mg of cupric chloride, stirred or ultrasonically dissolved to obtain solution A, and set aside; then prepare a mixed solution of mixed solvent and silver nitrate: weigh 1 g of silver nitrate and add it to 50 ml of mixed solvent, stir or shake to dissolve Uniform solution B, set aside.

[0028] Mix solution A and solution B uniformly at a volume ratio of 1:1 and transfer to a flask, heat up to boiling and reflux and keep for 3 hours, then stop heating. After the reaction is stopped, wash with 100 ml of water and 100 ml of ethanol and centrifuge, and finally dry the obtained precipitate to obtain dry powder silver nanosheets with a side length of 40 nanometers an...

Embodiment 2

[0030] Similar to the process of Example 1, but when preparing silver nanosheets, the inorganic salt containing halogen ions is replaced by potassium bromide to potassium chloride, and the dosage is reduced to 4 mg; while the copper-containing inorganic salt is replaced by copper chloride For copper nitrate, and reduce the dosage to 4 mg, other conditions remain unchanged. After the reaction is finished, wash and centrifuge with ethanol and ultra-pure water, and dry the precipitate at low temperature until it becomes a dry powder, so as to obtain silver nanosheets with a side length of 80 nanometers and a thickness of 10-15 nanometers. figure 2 Scanning electron microscope image of silver nanosheets with a side length of 80 nm, by figure 2 It can be seen that the silver nanosheets with a side length of 80 nanometers still have good dispersion and uniformity.

Embodiment 3

[0032] Similar to the process of Example 1, but when preparing silver nanosheets, polyvinylpyrrolidone was replaced with polydiallyl dimethyl ammonium chloride, and the amount was increased to 2 grams; the amount of silver nitrate was increased to 1.5 grams; heating and boiling reflux The post-hold time was extended to 4 hours, and other conditions remained unchanged. After the reaction is finished, wash and centrifuge with ethanol and ultrapure water, and dry the precipitate at low temperature until it becomes a dry powder, so as to obtain silver nanosheets with a side length of 100 nanometers and a thickness of 20 to 30 nanometers. image 3 Scanning electron microscope image of silver nanosheets with a side length of 100 nm, by image 3 It can be seen that while the side length of the silver nanosheet increases, the thickness also increases slightly, but still maintains high purity and high monodispersity.

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Abstract

The invention relates to a method for manufacturing series silver nano-sheets in a batch. The method includes dividing polyhydric alcohol, dimethyl formamide, high-polymer surfactant, metal salt adjuvant containing halogen and metal silver salt into three batches to be treated by the aid of the metal salt adjuvant containing the halogen; then uniformly mixing the materials; and obtaining the series silver nano-sheets by means of heating reaction. The silver nano-sheets are uniform in shape, high in purity, fine in monodispersity and low in cost, a reaction device is simple, large-scale preparation of the silver nano-sheets can be realized, and the method has an industrial prospect.

Description

technical field [0001] The invention relates to a method for preparing silver nanomaterials, in particular to a series of silver nanomaterials with controllable morphology and size that can be used in chemical and electrochemical catalysis, chemical sensors, biomolecular sensors, optical information storage, solar cells, etc. The method of preparation of the tablet. Background technique [0002] Due to its unique optical properties and special layered structure, silver nanosheets are widely used in optoelectronics, sensors, biomedicine, fast heat transfer, electromagnetic shielding, new energy, intelligent lighting systems, new generation displays and touch screens, etc. . There are many methods for traditionally preparing silver nanosheets, mainly light-induced transformation (R.Jin, Y.Cao, C.A.Mirkin, K.L.Kelly, G.C.Schatz, J.G.Zheng, Science 2001, 294, 1901; R.Jin, Y.C.Cao, E.Cao, E.Hao, G.S.Metraux, G.C.Schatz, C.A.Mirkin, Nature 2003, 294, 487; G.S.Metraux, Y.C.Cao, R...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/24
Inventor 丁轶谷小虎王正元
Owner 苏州冷石纳米材料科技有限公司
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