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Silver nanorod and preparing method thereof

A technology of silver nanorods and silver nitrate, applied in the field of nanomaterials, can solve the problems of many influencing factors, many by-products, low yield and the like, and achieves the effects of high preparation, easy operation and simple process

Inactive Publication Date: 2015-08-19
SHENZHEN INST OF ADVANCED TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The high-temperature solution method reacts quickly, but there are many influencing factors, resulting in many by-products, poor uniformity of nanorods, and low yield
Therefore, there are still difficulties in the batch preparation of silver nanorods.

Method used

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  • Silver nanorod and preparing method thereof
  • Silver nanorod and preparing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] The method for preparing silver nanorods in this embodiment includes the following steps:

[0038] Step 1: Take 3.5g polyvinylpyrrolidone (MW≈55000) and dissolve it in 35mL ethylene glycol (AR) (0.1g / mL), add it to the flask after dissolving it, magnetically stir and heat. Keep the temperature for 15 minutes after the temperature reaches 160℃;

[0039] Step 2: Add 80μL of 0.2mol / L sodium chloride glycol solution into the flask;

[0040] Step 3: After 5 minutes, add 4mL of 1mol / L silver nitrate ethylene glycol solution to the flask at a rate of 5% / min of the total volume. After adding 1 / 2, the remaining silver nitrate ethylene glycol solution is used for one time Added to the flask;

[0041] Step 4: The mixture is kept at constant temperature for 2 hours under magnetic stirring and condensing reflux; after it is naturally cooled, it is washed and centrifuged to obtain silver nanorods.

[0042] The yield of silver nanorods in this example was 85%.

[0043] Characterize the prepare...

Embodiment 2

[0045] The method for preparing silver nanorods in this embodiment includes the following steps:

[0046] Step 1: Dissolve 3.5g polyvinylpyrrolidone (MW≈55000) in 35mL glycerol (AR), add it to the flask after it is completely dissolved, stir magnetically and heat. Keep the temperature for 15 minutes after the temperature reaches 160℃;

[0047] Step 2: Add 60μL 0.2mol / L ferric chloride and glycerin solution into the flask;

[0048] Step 3: After 5 minutes, add 4mL of 1mol / L silver nitrate glycerol solution into the flask at a rate of 5% / min of the total volume, and then drop the remaining silver nitrate glycerol solution at once. Added to the flask;

[0049] Step 4: The mixed solution is kept at constant temperature for 2 hours under magnetic stirring and condensing reflux; after it is naturally cooled, it is washed and centrifuged to obtain silver nanorods.

[0050] The yield of silver nanorods in this example was 80%.

[0051] The electron micrograph of the silver nanorods of this exa...

Embodiment 3

[0053] The method for preparing silver nanorods in this embodiment includes the following steps:

[0054] Step 1: Take 3.5g polyvinylpyrrolidone (MW≈55000) and dissolve it in 35mL ethylene glycol (AR), add it to the flask after it is completely dissolved, stir and heat it magnetically. Keep the temperature for 15 minutes after the temperature reaches 160℃;

[0055] Step 2: Add 80μL of 0.2mol / L potassium bromide glycol solution into the flask;

[0056] Step 3: After 5 minutes, add 4mL of 1mol / L silver nitrate ethylene glycol solution to the flask at a rate of 5% / min of the total volume. After adding 1 / 2, the remaining silver nitrate ethylene glycol solution is used for one time Added to the flask;

[0057] Step 4: The mixture is kept at a constant temperature for 2 hours under magnetic stirring and reflux. After natural cooling, washing and centrifugation to obtain silver nanorods.

[0058] The yield of silver nanorods in this example was 83%.

[0059] The electron micrograph of the si...

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Abstract

The invention discloses a silver nanorod and a preparing method thereof. Polyhydric alcohols are used for reducing silver ions at high temperature to prepare the silver nanorod. The polyhydric alcohols are oxidized into acetaldehyde at high temperature. The acetaldehyde has strong reducibility, so that the silver ions are reduced to silver atoms. The silver atoms are gathered and stacked, seed crystals are formed, and the newly-generated silver atoms are induced to grow continuously on the seed crystals to obtain the silver nanorod. The technology is simple, operation is easy, and the method is suitable for batch preparing of silver nanorods with high yield and high evenness.

Description

Technical field [0001] The invention relates to the technical field of nanomaterials, in particular to a silver nanorod and a preparation method thereof. Background technique [0002] Silver nanomaterials are widely used in industries such as optoelectronics, chemistry, chemical engineering, and biomedicine due to their good electrical conductivity, thermal conductivity, catalytic performance and antibacterial ability. However, because silver materials are precious metals, are expensive, and are easily corroded under nanostructures, silver nanomaterials are filled into composite materials in most cases. One-dimensional silver nanomaterials (nanorods or nanowires) can reduce the conduction threshold of silver materials while maintaining the better performance of the composite material, thereby reducing the cost of the composite material. Among them, compared to silver nanowires, silver nanorods have a small aspect ratio, high rigidity, and are not easy to agglomerate and entangle...

Claims

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Application Information

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IPC IPC(8): B22F9/24B22F1/00B82Y40/00
Inventor 彭海炎钱小立袁海王文韬曾德文张欢
Owner SHENZHEN INST OF ADVANCED TECH
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