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Method for preparing fluorescing gold nano particles

A technology of gold nanoparticles and fluorescence, which is applied in the field of preparation of fluorescent gold nanoparticles, can solve the problems of low yield and harsh conditions, and achieve the effects of high yield, uniform distribution and simple process

Inactive Publication Date: 2008-05-14
LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Usually, the preparation method of organic monolayer protected metal (gold, silver) nanoparticles is mainly through phase transfer, that is, water-soluble metal ions enter a non-polar organic solvent through phase transfer, and then in the non-polar organic phase containing protective agent Prepared by reduction, the conditions are harsh and the yield is low

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  • Method for preparing fluorescing gold nano particles
  • Method for preparing fluorescing gold nano particles
  • Method for preparing fluorescing gold nano particles

Examples

Experimental program
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Effect test

Embodiment 1

[0020] Take 20ml of chloroauric acid aqueous solution (1mM), add 0.2ml of sodium citrate aqueous solution (112mM), add dropwise 1.5ml of 38.8mM sodium borohydride aqueous solution, stir and react at room temperature for 1 hour; then add 20ml

[0021] N,N'dibutyldithiocarboxylate octylfluorene (DBDTCC 8 F) in ethanol solution (1 mM), after 2 minutes, 20 ml of chloroform was added, stirred for 5 minutes, and separated. Separate the organic layer, wash with a large amount of ethanol, evaporate chloroform in vacuum, and dry in vacuum to obtain a black solid that is DBDTCC 8 F-modified gold nanoparticle composites.

[0022] figure 1 A gold nanoparticle hydrosol (a) and N,N'dibutyldithiocarboxylate octylfluorene (DBDTCC 8 F) UV-Vis spectra of modified gold nanoparticles (b).

Embodiment 2

[0024] Take 20ml of chloroauric acid aqueous solution (1mM), add 0.3ml of sodium citrate aqueous solution (112mM), add dropwise 1.5ml of 38.8mM sodium borohydride aqueous solution, and stir at room temperature for 2 hours; then add 10ml of DBDTCC 8 F in ethanol solution (1 mM), after 3 minutes, add 20 ml of chloroform, stir for 10 minutes, and separate layers. Separate the organic layer, wash with a large amount of ethanol, evaporate chloroform in vacuum, and dry in vacuum to obtain a black solid that is DBDTCC 8 F-modified gold nanoparticle composites.

[0025] figure 2 N, N'dibutyldithiocarboxylate octylfluorene (DBDTCC 8 F) Transmission electron micrograph of modified gold nanoparticles. It can be seen that the prepared nanoparticles have a uniform particle size, with a diameter of 4-10 nm, and the length of the scale is 100 nm.

Embodiment 3

[0027] Take 20ml of chloroauric acid aqueous solution (1mM), add 0.4ml of sodium citrate aqueous solution (112mM), add dropwise 2.0ml of 38.8mM sodium borohydride aqueous solution, and stir at room temperature for 3 hours; then add 20ml of DBDTCC 8 F in ethanol solution (1 mM), after 4 minutes, 20 ml of chloroform was added, stirred for 15 minutes, and the layers were separated. Separate the organic layer, wash with a large amount of ethanol, evaporate chloroform in vacuum, and dry in vacuum to obtain a black solid that is DBDTCC 8 F-modified gold nanoparticle composites.

[0028] image 3 N, N'dibutyldithiocarboxylate octylfluorene (DBDTCC 8 F) Fluorescence spectra of (a) and its modified gold nanoparticles (b).

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Abstract

The invention discloses a preparation method of fluorescent golden nanometer particle protected by stable organic monolayer. The preparation method is that: chloric acid water solution is mixed with sodium citrate, and then the mixture is subjected to reduction reaction with sodium borohydride to generate the hydrosol of the golden nanometer particle stabilized by citric acid; with the assistant of ethanol, N, N'dialkyl-dithio formic acid alkyl fluorene with fluorescent group moves the golden nanometer particle to organic phase so as to form the fluorescent golden nanometer particle compound protected by organic monocular. The preparation method is characterized by easy obtaining of the raw materials, simple technique, no need of heating, high efficiency and quickness, and high productivity, etc. The prepared golden nanometer particle compound has small particle diameter (4-30nm) and even distribution; through coordination adsorption of sulfur atoms in carbon-sulfur dual bonds on the surface of the golden nanometer particle, the golden nanometer particle can be steadily dispersed into a plurality of polarity and nonpolarity organic solvents; proved by experiment, the synthetical golden nanometer particle has very strong fluorescent property, thereby the golden nanometer particle has wide application prospect on the fields of nanometer electron, optoelectronic devices, optics, magnetism material, etc.

Description

technical field [0001] The invention relates to a preparation method of fluorescent gold nanoparticles protected by a stable organic monomolecular layer. Background technique [0002] Due to the characteristics of small size, large specific surface area, quantum size effect and macroscopic quantum tunneling effect, gold nanoscale materials show novel characteristics in terms of light, electricity, magnetism and chemistry. The research on the preparation, performance and application of the compound has been widely concerned at home and abroad. There are many preparation methods for gold nanoparticles, among which organic monomolecular layer protected nanoparticles (MPC) are different from traditional colloids and nanoparticles prepared by other methods. It usually uses organic small molecules as ligands, and the condensed phase and organic small molecules A supramolecular system assembled by covalent or non-covalent bonds in which the properties of each component are largely...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/58
Inventor 陈建敏万宏启周惠娣陈磊
Owner LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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