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Method for preparing Nano silver piece

A technology of silver nanosheets and silver nanoparticles is applied in the field of preparation of silver nanosheets, which can solve the problems such as difficulty in controlling the size of silver nanosheets, and achieve the effects of simple method, good stability and high purity.

Inactive Publication Date: 2007-05-09
CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the above methods require high-temperature reflow or laser irradiation, and it is difficult to control the size of silver nanosheets.
There are few reports on the synthesis of large-sized silver nanosheets.

Method used

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  • Method for preparing Nano silver piece
  • Method for preparing Nano silver piece
  • Method for preparing Nano silver piece

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] (1) Preparation of seeds: in the presence of 0.05mM AgNO 3 and 0.15mM sodium citrate in 100mL pure water, quickly add 1mL 30mM NaBH 4 , stirred for 1 hour, and the size of the obtained silver nanoparticles was 2.0-15.0 nm.

[0023] (2) Preparation of silver nanosheets: Prepare two solutions A and B. The composition of solution A: add 1.0 mL of the prepared seeds above to 60 mL of pure aqueous solution containing 0.6 mM hydrazine hydrate and 0.2 mM sodium citrate. Composition of solution B: 30mL containing 0.6mM AgNO 3 of aqueous solution. Then solution B was added dropwise into solution A (1 mL / min), and stirring was continued for 10 min after the addition was complete. The size of the obtained silver flakes is 83-95nm.

Embodiment 2

[0025] (1) Preparation of seeds: in the presence of 0.2mM AgNO 3 and 0.6mM sodium citrate in 100mL pure water, quickly add 1mL 120mM NaBH 4 , stirred for 1 hour, and the size of the obtained silver nanoparticles was 2.0-15.0 nm.

[0026] (2) Preparation of silver nanosheets: Prepare two solutions A and B. The composition of solution A: 0.7 mL of the above prepared silver nano-seeds were added to 60 mL of pure aqueous solution containing 0.6 mM hydrazine hydrate and 0.2 mM sodium citrate. Composition of solution B: 30mL containing 0.6mM AgNO 3 of aqueous solution. Then solution B was added dropwise into solution A (1 mL / min), and stirring was continued for 10 min after the addition was complete. The size of the obtained silver flakes is 63-76 nm.

Embodiment 3

[0028] (1) Preparation of seeds: in the presence of 1mM AgNO 3 and 3mM sodium citrate in 100mL pure water, quickly add 1mL 600mM NaBH 4 , stirred for 1 hour, and the size of the obtained silver nanoparticles was 2.0-15.0 nm.

[0029] (2) Preparation of silver nanosheets; prepare two solutions A and B. The composition of solution A: 0.5 mL of the prepared silver nano-seeds was added to 60 mL of pure aqueous solution containing 0.6 mM hydrazine hydrate and 0.2 mM sodium citrate. Composition of solution B: 30mL containing 0.6mM AgNO 3 of aqueous solution. Then solution B was added dropwise into solution A (1 mL / min), and stirring was continued for 10 min after the addition was complete. The size of the obtained silver flakes is 70-83nm.

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Abstract

A process for preparing the nano-flakes of monocrystalline silver features use of seed growing method in which the sodium citrate is used as wrapping agent and the surfactant is unnecessary. Its advantage is high purity and stability of product.

Description

technical field [0001] The invention relates to a method for preparing silver nanosheets. Background technique [0002] Due to the special optical properties of metal nanoparticles, the research on them, especially silver nanoparticles, is particularly attractive. These special optical properties arise from the interaction of light with free electrons inside the metal. By selecting the size, shape and surrounding medium of nanoparticles, the resonance frequency of metal nanoparticles can be adjusted arbitrarily in the visible and near-infrared range. This property has many practical applications in optics-related fields such as biosensors, metal-enhanced spectroscopy, and so on. The literature has also reported the method of preparing silver nanosheets by using the interaction of sodium citrate and silver. For example, Sun et al. have reported that using sodium citrate can promote the formation of silver triangle sheets under light or heating (see: Sun, Y.; Xia, Y. Adv. M...

Claims

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Application Information

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IPC IPC(8): B22F9/24
Inventor 董绍俊邹向勤应儿波
Owner CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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