Method for preparing silicon dioxide coated noble metal nanocrystalline

A technology of noble metal nanocrystals and silicon dioxide, which is applied in the direction of coating, etc., can solve the problems of poor affinity of silicon dioxide, etc., and achieve the effects of stable nanocrystals, easy preparation, and simple preparation methods

Inactive Publication Date: 2014-06-18
CHANGCHUN INST OF OPTICS FINE MECHANICS & PHYSICS CHINESE ACAD OF SCI
View PDF6 Cites 12 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to solve the problems that noble metal nanocrystals gather in alcoholic aqueous solution and noble metal nanocrystals have poor affinity to silicon dioxide in the existing process of synthesizing silicon dioxide coated noble metal nanocrystals, and provide a method for Preparation method of silicon oxide-coated noble metal nanocrystals

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method for preparing silicon dioxide coated noble metal nanocrystalline
  • Method for preparing silicon dioxide coated noble metal nanocrystalline
  • Method for preparing silicon dioxide coated noble metal nanocrystalline

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0029] The invention provides a method for preparing silicon dioxide-coated noble metal nanocrystals, comprising:

[0030] Step 1: mixing the aqueous solution of noble metal nanocrystals modified with mercaptocarboxylic acid and the alcohol solution to obtain a mixed solution;

[0031] Step 2: adding ammonia water and n-ethyl acetate (TEOS) to the mixed solution described in Step 1, and stirring to obtain a reaction mixture;

[0032] Step 3: Centrifuge and dissolve the reaction mixture obtained in Step 2 to obtain silica-coated noble metal nanocrystals.

[0033] Compared with the prior art, the preparation method provided by the present invention can keep the stability of the noble metal nanocrystal in the alcohol aqueous solution during the preparation process, and can improve the chemical affinity of the noble metal nanocrystal to the silicon dioxide coated on its surface. It can be used for the coating of noble metal nanocrystals such as citric acid-stabilized gold or silv...

Embodiment 1

[0080] The preparation of spherical gold nanocrystals with a particle diameter of about 15nm stabilized by citric acid in embodiment 1:

[0081] 1mL of 1% by mass percentage of chloroauric acid aqueous solution was added to 50mL of deionized water to obtain chloroauric acid solution;

[0082]Add the above-mentioned chloroauric acid solution into a three-necked bottle and heat to boiling; dissolve 0.1147g of sodium citrate in deionized water to obtain a 5% sodium citrate solution by mass; quickly add 0.8mL of sodium citrate solution into the three-necked flask, react under boiling for 1 hour, and cool to room temperature to obtain a citric acid-stabilized spherical gold nanocrystal solution with a particle size of about 15 nm.

Embodiment 2

[0083] Preparation of spherical gold nanocrystals with a particle diameter of about 40nm stabilized by citric acid in embodiment 2:

[0084] 3mL mass percentage is that 1% chloroauric acid aqueous solution is added to the deionized water of 75mL, obtains chloroauric acid solution;

[0085] The spherical gold nanocrystal solution described in 30mL embodiment 1 is mixed with 20mL deionized water and 2.4mL mass percent concentration of 5% sodium citrate solution and added to a 100mL flask to obtain a mixed solution;

[0086] A chloroauric acid aqueous solution was added to the above mixed solution, reacted at 70° C. for 1 h, and cooled to room temperature to obtain citric acid-stabilized spherical gold nanocrystals with a particle size of 40 nm;

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The invention provides a method for preparing silicon dioxide coated noble metal nanocrystalline, and belongs to the technical field of a nanocrystalline preparation method of a core-shell structure. The method comprises the steps: mixing noble metal nanocrystalline aqueous solution modified by mercaptocarboxylic acid with alcoholic solution to obtain a mixed solution; adding ammonium hydroxide and n-ethyl acetate into the mixed solution, stirring to obtain a reaction mixture; centrifuging and dissolving the obtained reaction mixture to obtain the silicon dioxide coated noble metal nanocrystalline. According to the method, the silicon dioxide is coated at the surface of the noble metal nanocrystalline to form the core-shell structure; the mercaptocarboxylic acid is used as a bifunctional molecule and can modify the noble metal nanocrystalline with different phases or the surface of the noble metal nanocrystalline with different forms. The preparation method is simple, and the nanocrystalline of the composite core-shell structure is stable.

Description

technical field [0001] The invention belongs to the technical field of preparation methods of nanocrystals with a core-shell structure, and in particular relates to a preparation method for silica-coated noble metal nanocrystals. Background technique [0002] Noble metal nanocrystals, such as spherical or rod-shaped gold or silver nanocrystals, have demonstrated great potential for applications in catalysis, optics, and biotracing. The premise of its application is to chemically modify the surface of the nanocrystal, so that the surface has groups with certain functions, so as to realize the interaction between the nanocrystal and its environment and maintain the stability of the nanocrystal in the environment. Among the numerous methods for surface modification of nanocrystals, the use of silane reagents to coat noble metal nanocrystals to form a silica-coated core-shell structure is a popular method. This is because silica has high stability in solution, especially in aqu...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
Patent Type & Authority Applications(China)
IPC IPC(8): B22F1/02
Inventor 李晓坤张友林刘晓敏涂浪平常钰磊孔祥贵
Owner CHANGCHUN INST OF OPTICS FINE MECHANICS & PHYSICS CHINESE ACAD OF SCI
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap