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A kind of silver nanosheet and its low temperature preparation method

A technology of silver nanosheets and low temperature, applied in the direction of nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc., can solve the problems of no verification, preparation of metal nanostructures, and few self-defects

Active Publication Date: 2022-05-20
XIAN TECH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The preparation methods of metal nanostructures include physical etching method, chemical synthesis method, light induction method, electrochemical method and biological method. Among them, the chemically synthesized metal nanostructures are diversified and have few defects, which are suitable for various research systems. Most of the synthesis methods rely on the reduction of metal ions and the differentiation and growth of metal structures at high temperatures, as well as the preparation of metal nanostructures at room temperature with the help of seed crystals or self-made templates. At present, there is no such method that can be prepared under extreme conditions such as freezing point temperature. The methods of metal nanostructures, or reports that have not verified whether metal nanostructures can be prepared under extremely low temperature conditions

Method used

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  • A kind of silver nanosheet and its low temperature preparation method
  • A kind of silver nanosheet and its low temperature preparation method
  • A kind of silver nanosheet and its low temperature preparation method

Examples

Experimental program
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Effect test

Embodiment 1

[0022] Under the condition of sufficient light, the room temperature is 16±1°C. When the temperature of the low-temperature reaction tank is stabilized at 0±0.02°C, place the reaction bottle containing 15ml of sodium dodecyl sulfate (SDS) aqueous solution with a concentration of 0.005mol / L in the Stir in the reaction tank at 700 rpm for 15-20 min, and take 49 μl successively at a concentration of 5×10 -4 mg / ml of sodium alginate (Alg) aqueous solution, 0.4ml of silver nitrate solution with a concentration of 0.01mol / L and 0.1ml of ascorbic acid (AA) with a concentration of 0.1mol / L were added to the reaction bottle and continued to stir for 1.5h. Centrifuge at a speed of 5000 rpm for 10-15 minutes, remove the supernatant, add an equal volume of aqueous solution to maintain the same speed and time for a second centrifugation, remove the supernatant again, and the lower precipitate is the reaction product, add a certain amount of aqueous solution to dissolve It is kept dispersed...

Embodiment 2

[0025] Prepare hexagonal silver nanosheets using substantially the same method steps as in Example 1, the difference is that: the amount of sodium alginate is 50 μl, the reaction time is 2h, and the length of opposite sides of hexagonal silver nanosheets can be prepared as 350nm ~500nm, and will be accompanied by a tail-like structure of 200~300nm, the morphology of the scanning electron microscope is as follows Figure 4 As shown in (a), it is obvious that the high yield of silver nanosheets is accompanied by only a few large by-product particles.

Embodiment 3

[0027] Prepare hexagonal silver nanosheets using substantially the same method steps as in Example 1, the difference is that: the amount of sodium alginate is 100 μl, the reaction time is 3h, and the length of opposite sides of hexagonal silver nanosheets can be prepared as 400nm ~600nm, and will be accompanied by a tail-like structure of 300~700nm, the morphology of the scanning electron microscope is as follows Figure 4 (b) shown.

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Abstract

The invention discloses a silver nanosheet and a low-temperature preparation method thereof. The technical scheme of the present invention is: a method for preparing silver nanosheets at low temperature, taking an aqueous solution of sodium lauryl sulfate and placing it under low temperature conditions to stir evenly for 15 to 20 minutes, then adding an aqueous solution of sodium alginate, silver nitrate solution and ascorbic acid solution in sequence , keep stirring and reacting at low temperature for 1-3 hours, after the reaction solution is centrifuged for 10-15 minutes, take the lower precipitate and disperse it in the aqueous solution, repeat the centrifugation step again and disperse the lower precipitate in the aqueous solution. The invention provides a method for preparing hexagonal silver nanosheets under freezing point low temperature conditions. Sodium alginate and sodium lauryl sulfate, which are green natural polysaccharide polymer materials, are selected as soft templates of the reaction system at low temperatures, which are stable High-yield preparation of silver nanosheets.

Description

technical field [0001] The invention belongs to the technical field of nanostructure preparation, and in particular relates to a silver nanosheet and a low-temperature preparation method thereof. Background technique [0002] With its own unique size effect, nanostructures stand out in the fields of optics, electricity, mechanics and catalysis, especially metal nanostructures have more stable chemical and physical properties, so the preparation of nanoscale metal structures has become a research field of nanostructures. A big hit. [0003] The preparation methods of metal nanostructures include physical etching method, chemical synthesis method, light induction method, electrochemical method and biological method. Among them, the chemically synthesized metal nanostructures are diversified and have few defects, which are suitable for various research systems. Most of the synthesis methods rely on the reduction of metal ions and the differentiation and growth of metal structu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F9/24B22F1/054B82Y40/00B82Y30/00
CPCB22F9/24B82Y40/00B82Y30/00B22F1/0553B22F1/054
Inventor 梁雨刘卫国杨鹏飞张大霄
Owner XIAN TECH UNIV