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Preparation method of environment-friendly micron-size triangular silver sheet

An environmentally friendly, micron-scale technology is applied in the field of preparing micron-scale triangular silver flakes by using double weak reducing agents, which can solve the problems of environmental pollution of organic solvents and reducing agents, increase the difficulty of experimental operation, and low yield of triangular silver flakes. The effect of good oxidation resistance and anti-agglomeration, low experimental conditions and easy operation

Active Publication Date: 2011-07-27
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

So far, the methods for preparing triangular silver nanosheets mainly include light-induced synthesis, template method, micellar method, etc. These methods often use light wave irradiation with specific wavelengths, high temperature and high pressure reactions, and addition of template molecules. The requirements for equipment are high, which increases the difficulty of experimental operation and is not conducive to large-scale preparation, and the large amount of organic solvents and reducing agents used may pollute the environment
On the other hand, the triangular silver flakes prepared by traditional methods still have problems such as low yield (doped with a large number of nanostructures of other shapes), irregular shape (missing corners, large size distribution), and the obtained silver nanosheets The size is mainly concentrated between 50nm-400nm, and there is no large-scale high-yield synthesis of micron-sized triangular silver flakes

Method used

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  • Preparation method of environment-friendly micron-size triangular silver sheet
  • Preparation method of environment-friendly micron-size triangular silver sheet
  • Preparation method of environment-friendly micron-size triangular silver sheet

Examples

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preparation example Construction

[0034] A method for preparing an environmentally friendly micron-scale triangular silver flake, comprising the steps of:

[0035] 1. Dissolve 1.5g of solid silver nitrate in 20mL of deionized water to prepare silver nitrate oxidation solution, fully dissolve it for later use; dissolve 3.0g of polyvinylpyrrolidone (PVP) and 1.67g of D(+)-glucose in another Part 20mL deionized water, made into reducing solution;

[0036] 2. Add the silver nitrate oxidizing solution dropwise to the reducing solution at a rate of 1 mL / min while stirring at room temperature. After the dropwise addition is complete, continue to stir vigorously for 30 minutes to obtain a uniform yellow solution;

[0037] 3. Stop stirring, place the resulting mixed solution in an oven, and keep the temperature at 90 degrees Celsius for 48 hours to obtain a silver-gray silver colloidal solution;

[0038] 4. Naturally cool the silver colloid solution to room temperature, then place it in ice water for 15 minutes, centr...

Embodiment 2

[0043] A method for preparing an environmentally friendly micron-scale triangular silver flake, comprising the steps of:

[0044] 1. Dissolve 0.30g of solid silver nitrate in 20mL of deionized water to make silver nitrate oxidation solution, fully dissolve it for later use; dissolve 0.6g of polyvinylpyrrolidone (PVP) and 0.33g of D(+)-glucose in another Part 20mL deionized water, made into reducing solution;

[0045] 2. Add the silver nitrate oxidizing solution dropwise to the reducing solution at a rate of 1 mL / min while stirring at room temperature. After the dropwise addition is complete, continue to stir vigorously for 30 minutes to obtain a uniform yellow solution;

[0046] 3. Stop stirring, place the obtained mixed solution in an oven, and keep the temperature at 75 degrees Celsius for 72 hours to obtain a silver-gray silver colloidal solution;

[0047] 4. Cool the silver colloid solution to room temperature naturally, then place it in ice water for 15 minutes, centrifuge...

Embodiment 3

[0052] A method for preparing an environmentally friendly micron-scale triangular silver flake, comprising the steps of:

[0053] 1. Dissolve 0.9g of solid silver nitrate in 20mL of deionized water to prepare silver nitrate oxidation solution, fully dissolve it for later use; dissolve 1.8g of polyvinylpyrrolidone (PVP) and 1.00g of D(+)-glucose in another Part 20mL deionized water, made into reducing solution;

[0054] 2. Add the silver nitrate oxidizing solution dropwise to the reducing solution at a rate of 1 mL / min while stirring at room temperature. After the dropwise addition is complete, continue to stir vigorously for 30 minutes to obtain a uniform yellow solution;

[0055] 3. Stop stirring, place the resulting mixed solution in an oven, and keep the temperature at 95 degrees Celsius for 48 hours to obtain a silver-gray silver colloidal solution;

[0056] 4. Naturally cool the silver colloid solution to room temperature, then place it in ice water for 15 minutes, centr...

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Abstract

The invention discloses a preparation method of an environmentally-friendly micron-size triangular silver sheet. The method comprises the following steps of: preparing a silver nitrate oxidation liquid and a reduction liquid containing polyvinyl pyrrolidone (PVP) and D(+)-dextrose, stirring at room temperature and dropwise adding the silver nitrate oxidation liquid into the reduction liquid to obtain a uniform yellow solution; placing the obtained mixed liquor into a drying oven, preserving heat at the temperature between 75 DEG C and 95 DEG C for 48-72 hours to obtain a silver-gray fulmarginsolution; cooling and standing the fulmargin solution, centrifuging and separating; washing nano silver powder obtained by centrifuging with acetone and cold ethanol respectively; and re-dispersing the washed nano silver powder into the ethanol for later use. The prepared micron-size triangular silver sheet has the advantages of high yield, regular shape, difficulty in aggregating, high stability, simple synthesizing process, environmentfriendliness and preparation on a large scale.

Description

technical field [0001] The invention relates to a method for preparing a micron-sized triangular silver flake, in particular to a method for preparing a micron-sized triangular silver flake by using double weak reducing agents. Background technique [0002] Among all noble metals, silver has the greatest electrical and thermal conductivity, the lowest price, and rich optical properties, and has attracted much attention. With the rapid development of optics, electronic industry and micro-processing technology, nano-silver powder can be used as conductive adhesive and conductive paste to form a film with high conductivity and strong adhesion after spin coating or printing. It has important application value in the fields of electrodes and special optical devices, so it has attracted much attention in the related chemical and optoelectronic industries. [0003] At present, the commonly used methods for preparing nano-silver powder at home and abroad include: thermal decomposit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/24
Inventor 陈海波曹镛彭俊彪王坚袁俊轩郑华
Owner SOUTH CHINA UNIV OF TECH
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