Flower-like nanometer silver sphere, preparation method and application thereof

A silver nano, flower-like technology, applied in nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc., can solve problems such as toxic organic solvents, affecting human health, and harsh reaction conditions

Active Publication Date: 2017-09-05
GUANGDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the traditional method of preparing silver nanomaterials has harsh reaction conditions, high equipment requirements, cumbersome preparation methods, and often uses toxic organic solvents, which affect human health and cause environmental pollution, which does not conform to the concept of green chemistry.

Method used

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  • Flower-like nanometer silver sphere, preparation method and application thereof
  • Flower-like nanometer silver sphere, preparation method and application thereof
  • Flower-like nanometer silver sphere, preparation method and application thereof

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preparation example Construction

[0025] The invention provides a preparation method of flower-shaped silver nanospheres, comprising the following steps:

[0026] Adjusting the amino acid solution to a pH value of 4-6 with a pH regulator to obtain a reducing agent solution, the amino acid solution being selected from a cysteine ​​solution or a reduced glutathione solution;

[0027] Under the condition of stirring, the reducing agent solution and the silver ammonia solution are mixed and reacted to obtain flower-shaped silver nanospheres;

[0028] The amount ratio of the reducing agent in the reducing agent solution to the silver ion in the silver ammonia solution is 1:1-1:10, the reaction temperature is 30-80° C., and the reaction time is 5-10 hours.

[0029] The method provided by the invention uses cysteine ​​or reduced glutathione as a reducing agent and an active agent under the condition that there is no template, and obtains silver nanospheres with a flower-like structure in one step. The method has mil...

Embodiment 1

[0044] (1) Prepare 1mmol / L silver ammonia solution with deionized water;

[0045] (2) Prepare 1mmol / L reduced glutathione solution with deionized water;

[0046] (3) prepare 1% sodium hydroxide with deionized water;

[0047](4) Regulate the pH value of the reduced glutathione solution with 1% sodium hydroxide solution to be 5;

[0048] (5) Add reduced glutathione solution dropwise to the constantly stirring silver ammonia solution at 30°C, so that the ratio of reduced glutathione to silver ions is 1:1, and continue the reaction for 7.5 hours to obtain a flower-shaped silver nanospheres.

[0049] The present invention carries out scanning electric competition analysis to the flower-shaped silver nanosphere prepared in embodiment 1, and the results are shown in figure 1 with figure 2 , figure 1 A scanning electron microscope picture enlarged 5000 times for the flower-shaped silver nanospheres prepared in Example 1 of the present invention; figure 2 The scanning electron ...

Embodiment 2

[0054] (1) Prepare 5mmol / L silver ammonia solution with deionized water.

[0055] (2) Prepare 1 mmol / L cysteine ​​(L-cys) solution with deionized water.

[0056] (3) Prepare 3% sodium hydroxide solution with deionized water.

[0057] (4) Adjust the pH of the cysteine ​​(L-cys) solution to 6 with 3% sodium hydroxide solution.

[0058] (5) Add cysteine ​​(L-cys) solution dropwise to the constantly stirring silver ammonia solution at 40°C, so that the ratio of cysteine ​​(L-cys) to silver ions is 1:3, and the reaction continues After 7 hours, flower-shaped silver nanospheres were obtained.

[0059] The Zeta potential value and Raman effect of the flower-shaped silver nanospheres prepared in Example 2 are similar to those of the flower-shaped silver nanospheres prepared in Example 1, and will not be described in detail here.

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Abstract

The invention provides a flower-like nanometer silver sphere, a preparation method and an application thereof. The preparation method comprises the following steps: adopting a pH value regulator for regulating pH value of an amino acid solution to 4-6, thereby acquiring a reducing agent solution, wherein the amino acid solution is selected from cysteine solution or reduced glutathione solution, and then mixing the reducing agent solution with a silver ammonium solution under a stirring condition and reacting, thereby acquiring the flower-like nanometer silver sphere. The mass ratio of silver ions in the reducing agent in the reducing agent solution and the silver ammonium solution is at (1:1) to (1:10); the reaction temperature is at 30-80 DEG C; the time is 5-10h. The method is characterized by mild reaction condition, simple and convenient operation and less environmental pollution. According to the method, the flower-like nanometer silver sphere has better optical characteristics and stability in the manner of controlling the dosage of the preparation raw materials and the reaction condition; the Zeta potential value of the flower-like nanometer silver sphere can reach up to +50mV; the raman effect is stronger.

Description

technical field [0001] The invention relates to the technical field of nanomaterials, in particular to a flower-shaped silver nanosphere, its preparation method and its application. Background technique [0002] Nanomaterials refer to materials that have at least one direction in the three-dimensional space that is still on the scale of 1-100nm. Nanomaterials can be divided into three categories according to their dimensions: (1) zero-dimensional, such as quantum dots, nanoparticles, atomic clusters, nanoholes, etc.; (2) one-dimensional, such as nanorods, nanowires, nanowires, and nanotubes. etc.; (3) Two-dimensional, such as ultra-thin films, quantum wells, superlattices, etc. Nanomaterials are different from traditional solid materials, because of their large specific surface area, they exhibit many specific properties, and their properties are closely related to their size and shape. Generally speaking, the practical application of most functional materials, as well as ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/24B22F1/00B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00B22F9/24B22F1/0553B22F1/07B22F1/054
Inventor 郭清泉谢宇张慧谭威马新福
Owner GUANGDONG UNIV OF TECH
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