Method for preparing silica/silver nuclear shell structure granules by using polyvinyl pyrrolidone (PVP) in an assistant way

A silica and shell structure technology, applied in nanostructure manufacturing, nanotechnology, nanotechnology and other directions, can solve the problems of easy agglomeration of particles, difficult to adjust the absorption peak of core-shell structure, complicated preparation methods, etc., to achieve catalytic chemical reaction, Enhanced Raman scattering and enhanced dye luminescence

Inactive Publication Date: 2010-07-07
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There have been some reports on the preparation of silica / silver core-shell structure, but there are shortcomings such as the surface silver layer is not dense enough, the particles are easy to agglomerate, the absorption peak of the core-shell structure is difficult to adjust, and the preparation method is complicated, which greatly limits the silica / silver core-shell structure. Application of silver core shell structure

Method used

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  • Method for preparing silica/silver nuclear shell structure granules by using polyvinyl pyrrolidone (PVP) in an assistant way
  • Method for preparing silica/silver nuclear shell structure granules by using polyvinyl pyrrolidone (PVP) in an assistant way
  • Method for preparing silica/silver nuclear shell structure granules by using polyvinyl pyrrolidone (PVP) in an assistant way

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Add 0.1 g of silica spheres with a diameter of 300 nm to 10 ml of water for ultrasonic dispersion for 20 minutes, add to 10 ml of 3% SnCl 2 2H 2 O in a dilute hydrochloric acid solution (add 100 microliters of 37% concentrated hydrochloric acid) and stir for 30 minutes, centrifuge and wash with deionized water 5 times, and disperse into 5 milliliters of water. Under ultrasonic conditions, add the sphere liquid to 15 ml of 0.35 mol / L silver ammonia solution and react for 20 minutes. A layer of small silver particles grow on the surface of the silica sphere, which is centrifugally cleaned and dispersed into 10 ml of ethanol. Add 1 gram of PVP to 220 milliliters of water and stir to dissolve, add 0.5 milliliters of 1 mol / liter silver nitrate aqueous solution, prepare 3 parts of this solution, add 0.2 milliliters and 0.4 milliliters of silica ball solutions with small silver particles on the surface, respectively, 0.8 milliliters, then add 0.2 milliliters of formaldehyde, ...

Embodiment 2

[0026] Add 0.1 g of silica spheres with a diameter of 1000 nm to 10 ml of water for ultrasonic dispersion for 20 minutes, add to 10 ml of 3% SnCl 2 2H 2 O in a dilute hydrochloric acid solution (add 100 microliters of 37% concentrated hydrochloric acid) and stir for 30 minutes, centrifuge and wash with deionized water 5 times, and disperse into 5 milliliters of water. Under ultrasonic conditions, add the sphere liquid to 15 ml of 0.35 mol / L silver ammonia solution and react for 20 minutes. A layer of small silver particles grow on the surface of the silica sphere, which is centrifugally cleaned and dispersed into 10 ml of ethanol. Add 1 g of PVP to 220 ml of water and stir to dissolve, add 0.5 ml of 1 mol / L silver nitrate aqueous solution, and prepare 3 equal parts of this solution. Add 0.2 milliliters, 0.4 milliliters, and 0.8 milliliters of silica sphere solutions with small silver particles on the surface, then add 0.2 milliliters of formaldehyde and 0.4 milliliters of amm...

Embodiment 3

[0028] Add 0.1 g of silica spheres with a diameter of 300 nm to 10 ml of water for ultrasonic dispersion for 20 minutes, add to 10 ml of 3% SnCl 2 2H 2 O in a dilute hydrochloric acid solution (add 100 microliters of 37% concentrated hydrochloric acid) and stir for 30 minutes, centrifuge and wash with deionized water 5 times, and disperse into 5 milliliters of water. Under ultrasonic conditions, add the sphere liquid to 15 ml of 0.35 mol / L silver ammonia solution and react for 20 minutes. A layer of small silver particles grow on the surface of the silica sphere, which is centrifugally cleaned and dispersed into 10 ml of ethanol. Add 0.5 g of PVP to 220 ml of water and stir to dissolve, add 0.5 ml of 1 mol / L silver nitrate aqueous solution, and prepare 3 equal parts of this solution. Add 0.2 milliliters, 0.4 milliliters, and 0.8 milliliters of silica sphere solutions with small silver particles on the surface, then add 0.2 milliliters of formaldehyde and 0.4 milliliters of am...

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Abstract

The invention discloses a method for preparing silica / silver nuclear shell structure granules by using polyvinyl pyrrolidone (PVP) in an assistant way. An adopted polyvinyl pyrrolidone assistant nucleation-regrowing two-step growth process comprises the following steps of: (1) preparing submicron silica spheres with surfaces absorbing nano silver granules; (2) dispersing the submicron silica spheres obtained in the step (1) in a polyvinyl pyrrolidone (PVP) water solution, and reducing silver nitrate by using formaldehyde under the catalysis of ammonia water; and (3) centrifugally cleaning reaction liquid obtained in the step (2), and then dispersing into ethanol or water to obtain a colloidal solution of the silica / silver nuclear shell structure granules. The method has the advantages of inexpensive and easily obtainable used drugs, simple and controllable process, good product monodispersity and uniform dimension, can obtain the nuclear shell structure granules with different opticaldelustering peak positions by regulating the thickness of a silver layer, and can be used for photonic crystals, biological detection, surface-enhanced Raman scattering, surface plasmons enhanced luminescence, and the like.

Description

technical field [0001] The invention relates to a method for preparing silicon dioxide / silver core-shell structure particles, belonging to the field of photonic materials. Background technique [0002] Micro-nano particles of noble metals (such as gold, silver, platinum, etc.) have surface plasmon resonance properties, and their extinction properties change with changes in particle size, shape, and environmental refractive index. A variety of noble metal micro-nanostructures such as gold nanorods, spherical gold particles, silver cubes, silver triangles, silica / gold core-shell structures, etc. absorption band. The local electromagnetic field enhancement caused by plasmon resonance can be used to enhance the luminescence intensity of luminophores near noble metal particles, and the coupling of metals to luminophores can change the radiation rate of luminophores. Noble metal particles can also be used to enhance Raman scattering of molecules and catalyze chemical reactions. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B82B3/00
Inventor 李东升刘涛杨德仁
Owner ZHEJIANG UNIV
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