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Macro-scale preparation method of monodisperse silver nanosheets

A silver nanosheet, monodisperse technology, applied in nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc., can solve problems such as unfavorable macro-preparation

Active Publication Date: 2016-08-17
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, as a product of kinetically controlled growth of silver nanosheets, in order to facilitate the growth of nanosheets and avoid the occurrence of secondary nucleation, silver ions in the system (Ag + ) concentration is controlled at a low level, so when preparing silver nanosheets with a side length greater than 1um, it is necessary to complete the growth of nanosheets through multiple cycles, which is not conducive to macro-production

Method used

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  • Macro-scale preparation method of monodisperse silver nanosheets
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  • Macro-scale preparation method of monodisperse silver nanosheets

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] A method for the macro preparation of monodisperse silver nanosheets, the steps are as follows:

[0039] (1) Add 0.222g of PVP to 50mL silver nanosheet seed crystal suspension, stir and dissolve at 30°C, add 0.13134g of C 6 h 8 o 7 , forming a homogeneous mixed solution;

[0040] (2) Combine PVP and NH 4 Add SCN to water and stir evenly, the molar ratio of PVP to water is 1:50, NH 4 The molar ratio of SCN to water is 1:350; then add AgNO with a concentration of 10 g / L at a rate of 5 mL / min in a water bath at 45 °C 3 Aqueous solution, AgNO 3 with NH 4 The molar ratio of SCN is 1:1, and the reaction is continued for 0.5h after the feeding is completed, the solid product is centrifuged at a rate of 8000r / min, and the solid product is washed with water for 4 times, and then dried in air at 90°C to obtain AgCNS crystals. granule, the AgCNS crystal grain is dispersed in water, is mixed with the AgCNS suspension that concentration is 45wt%, stand-by;

[0041] (3) Then ...

Embodiment 2

[0044] A method for the macro preparation of monodisperse silver nanosheets, the steps are as follows:

[0045] (1) Add 0.222g of PVP to 50mL silver nanosheet seed suspension, stir and dissolve at 30°C, then add 0.13134g of C 6 h 8 o 7 , forming a homogeneous mixed solution;

[0046] (2) Combine PVP and NH 4 Add SCN to water and stir evenly, the molar ratio of PVP to water is 1:50, NH 4 The molar ratio of SCN to water is 1:350; then add AgNO with a concentration of 10 g / L at a rate of 5 mL / min in a water bath at 45 °C 3 Aqueous solution, AgNO 3 with NH 4 The molar ratio of SCN is 1:1, and the reaction is continued for 0.5h after the feeding is completed, the solid product is centrifuged at a rate of 8000r / min, and the solid product is washed with water for 4 times, and then dried in air at 90°C to obtain AgCNS crystals. granule, the AgCNS crystal grain is dispersed in water, is mixed with the AgCNS suspension that concentration is 45wt%, stand-by;

[0047] (3) Then add...

Embodiment 3

[0050] A method for the macro preparation of monodisperse silver nanosheets, the steps are as follows:

[0051] (1) Add 0.222g of PVP to 50mL silver nanosheet seed suspension, stir and dissolve at 30°C, then add 0.13134g of C 6 h 8 o 7 , forming a homogeneous mixed solution;

[0052] (2) Combine PVP and NH 4 Add SCN to water and stir evenly, the molar ratio of PVP to water is 1:60, NH 4 The molar ratio of SCN to water is 1:250; then add AgNO with a concentration of 15 g / L at a rate of 1 mL / min in a water bath at 30 °C 3 Aqueous solution, AgNO 3 with NH 4 The molar ratio of SCN is 1:1. Continue to react for 1 hour after the addition is complete, centrifuge the solid product at a rate of 3000r / min, wash the solid product with water for 3 times, and then dry it in the air at 60°C to obtain AgCNS grains , dispersing the AgCNS crystal grains in water, and preparing a AgCNS suspension with a concentration of 45wt%, for use;

[0053] (3) Then add 0.04mL of the AgCNS suspensio...

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Abstract

The present invention relates to the macro-preparation method of monodisperse silver nano sheet, and the steps are as follows: (1) under the condition of water bath, add PVP and citric acid to silver nano sheet seed crystal suspension, form homogeneous solution; (2) mix PVP and NH 4 SCN and other salts that can form insolubles with silver and AgNO 3 Aqueous solution reaction makes silver insoluble suspensions such as AgCNS; (3) in step (1), add the suspension that step (2) makes or NH 4 SCN and other salts that can form insolubles with silver, then add hydrazine hydrate, react, add AgNO 3 , react again, and centrifuge the solid product to obtain that product. The process conditions of the method are easy to control, and are suitable for large-scale production. The yield of the obtained silver nanosheets reaches 99.0%, the purity is high, and the size is controllable, which can be used in optical sensors, optical lens technology, biological labels, conductive silver paste, and the like.

Description

technical field [0001] The invention relates to a macro-preparation method of monodisperse silver nanosheets, which belongs to the field of inorganic chemical industry. Background technique [0002] Metal silver has stable properties, soft quality, good ductility, high thermal conductivity and electrical conductivity, acid and alkali corrosion resistance, etc., and is relatively cheap in precious metals, and is widely used in photosensitive materials, contact materials, decorative materials, pastes and other fields , occupies a very important position in industry and daily life. Nanoscale silver has special properties that are completely different from bulk materials, such as small size effects, quantum effects, etc.; the properties of nanosilver with different particle sizes and shapes are also different. At present, people have prepared various sizes and shapes. The appearance of one-dimensional and two-dimensional silver nanomaterials, among which two-dimensional silver ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F9/24B82Y30/00B82Y40/00
Inventor 陈代荣赵新富焦秀玲陈波
Owner SHANDONG UNIV
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