Method for preparing two-dimensional silver nanosheets of different shapes

A technology of silver nanosheets and morphology, which is applied in the field of preparing two-dimensional silver nanosheets, can solve the problem of temperature control, etc., and achieve the effects of simple equipment, simple operation and uniform particle size.

Inactive Publication Date: 2014-01-22
NANJING UNIV OF POSTS & TELECOMM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Silver nanocubes have been prepared by using the silver mirror reaction, such as the silver nanocubes with a diameter of about 55 nm prepared by researchers at the University of Hong Kong (see Yu, D.; Yam, V. W.-W. J Am Chem Soc 2004, 126, 13200 .), but so far, there is no report on the preparation of two-dimensional silver nanosheets with different morphologies by controlling the temperature during sample addition and adjusting the concentration ratio of cetyltrimethylammonium bromide solution to silver ammonia solution

Method used

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  • Method for preparing two-dimensional silver nanosheets of different shapes

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Experimental program
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Effect test

Embodiment 1

[0015] First, using the silver mirror reaction, 5 ml of silver ammonia solution with a mass concentration of 1 mM was added to the beaker, and then, using glucose as a reducing agent, 10 ml of a glucose solution with a mass concentration of 2-9 mM was added to the beaker and heated at 35 Stir in a water bath at ~45°C for 3-5 min, and finally, use cetyltrimethylammonium bromide as a surfactant, add 3 ml cetyltrimethylammonium bromide solution with a mass concentration of 50 mM Add the above mixed solution and stir in a water bath at 35-45°C for 3-5 minutes, transfer the mixed solution in the beaker to the reactor and react at 100-150°C for 10-12 hours, take out the reacted solution, centrifuge and disperse it by ultrasonic A two-dimensional silver nanosheet solution was prepared.

[0016] The silver nanosheet solution was characterized by transmission electron microscopy, and the particle size of the silver nanosheets was between 15 and 30 nm, mainly concentrated at 20 nm.

Embodiment 2

[0018] First, using the silver mirror reaction, 5 ml of silver ammonia solution with a mass concentration of 1 mM was added to the beaker, and then, using glucose as a reducing agent, 10 ml of a glucose solution with a mass concentration of 2-9 mM was added to the beaker and heated at 35 Stir in a water bath at ~45°C for 3-5 min, and finally, use cetyltrimethylammonium bromide as a surfactant, add 3 ml cetyltrimethylammonium bromide solution with a mass concentration of 50 mM Add the above mixed solution and stir in a water bath at 35-45°C for 3-5 minutes, transfer the mixed solution in the beaker to the reactor and react at 100-150°C for 10-12 hours, take out the reacted solution, centrifuge and disperse it by ultrasonic A two-dimensional silver nanosheet solution was prepared.

[0019] The silver nanosheet solution was characterized by transmission electron microscopy, and the particle size of the silver nanosheets was between 15 and 30 nm, mainly concentrated at 20 nm.

Embodiment 3

[0021] First, using the silver mirror reaction, 5 ml of silver ammonia solution with a mass concentration of 1 mM was added to the beaker, and then, using glucose as a reducing agent, 10 ml of a glucose solution with a mass concentration of 2-9 mM was added to the beaker and heated at 35 Stir in a water bath at ~45°C for 3-5 min, and finally, use cetyltrimethylammonium bromide as a surfactant, add 3 ml cetyltrimethylammonium bromide solution with a mass concentration of 50 mM Add the above mixed solution and stir in a water bath at 35-45°C for 3-5 minutes, transfer the mixed solution in the beaker to the reactor and react at 100-150°C for 10-12 hours, take out the reacted solution, centrifuge and disperse it by ultrasonic A two-dimensional silver nanosheet solution was prepared.

[0022] The silver nanosheet solution was characterized by transmission electron microscopy, and the particle size of the silver nanosheet was between 20 and 60 nm, mainly concentrated at 40 nm.

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Abstract

The invention discloses a method for preparing two-dimensional silver nanosheets of different shapes. Firstly, a silver mirror reaction is adopted, glucose serves as a reducing agent, a quantitative silver-ammonia solution and the quantitative glucose solution are sequentially added into a beaker to be mixed, then cetyl trimethyl ammonium bromide serves as a surface active agent, the cetyl trimethyl ammonium bromide solution is added into the mixed solution, then high-temperature reaction is carried out on the mixed solution, and a solution of the two-dimensional silver nanosheets of the different shapes is prepared by adjusting the concentration ratio of the cetyl trimethyl ammonium bromide solution and the silver-ammonia solution. The method has the advantages that operation is easy, cost is low, equipment is simple, and the prepared silver nanosheets are uniform in grain size, good in water solubility and free of obvious gathering.

Description

technical field [0001] The invention relates to a method for preparing two-dimensional silver nanosheets, in particular to a method for preparing two-dimensional silver nanosheets with different shapes. Background technique [0002] Silver nanoparticles have high surface activity, surface energy, and catalytic activity, and can be widely used as materials such as catalysts, battery electrodes, low-temperature conduction, and conductive pastes. In addition, silver nanoparticles have the advantages of strong bactericidal ability, good biocompatibility and easy surface modification, and can be applied to antibacterial materials, medical materials, biomarkers, biological separation, purification, etc. Therefore, research on silver nanoparticles It has important significance and broad application prospects. [0003] Surface Enhanced Raman Scattering (SERS) [3] It is a phenomenon in which the intensity of Raman signals is significantly enhanced when particles such as molecules a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/24G01N21/65B82Y40/00
Inventor 汪联辉张磊张颖胡艳玲
Owner NANJING UNIV OF POSTS & TELECOMM
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