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Method for preparing gold nanoparticles

A technology of gold nanoparticles and seeds, applied in the field of preparation of gold nanoparticles, can solve the problems of difficult amplification of the reaction, low degree of agglomeration, narrow particle size distribution, etc., and achieve the effects of easy acquisition, low degree of agglomeration, and narrow particle size distribution

Active Publication Date: 2013-09-04
EAST CHINA NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Compared with other synthetic methods, the seed method synthesizes gold nanoparticles with narrow particle size distribution, better dispersion, lower degree of agglomeration, and more uniform morphology, but the reaction is not easy to scale up

Method used

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  • Method for preparing gold nanoparticles
  • Method for preparing gold nanoparticles
  • Method for preparing gold nanoparticles

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-4

[0034] Example 1-4 Preparation of micro-nano hydrogen bubble water_different H 2 Access time (take sodium polyacrylate as an example, the same method as other wrapping agents)

[0035] Measure 1L of double distilled water and add it to the micro-nano bubble generator, add a certain amount of 100mL0.01M sodium polyacrylate, vacuumize for 3min, and pass in Ar or N 2 Return to normal pressure, repeat 2 to 3 times. Turn on the micro-nano bubble generator and pass in H for a certain period of time 2 Prepare micro-nano hydrogen bubble water.

[0036] Example 1 Example 2 Example 3 Example 4 Access to H 2 time 1min 2min 4min 6min Solution temperature (°C) 23.5 26.4 29.5 32.9

[0037] Access to different time H 2 NanoSight curves for dispersions, see figure 1 . The experimental results show that the size of the hydrogen bubbles is mainly concentrated around 100nm, and with the introduction of H 2 As the time prolongs, the concentratio...

Embodiment 5

[0038] Example 5 Seed Post-Addition Preparation of Gold Nanoparticles

[0039] (1) Preparation of gold seeds: Measure 0.5mL of 1% (wt%) HAuCl 4 Add to a 100mL Erlenmeyer flask, add 45mL of double distilled water, stir for 1min, then add 4.6mL of 0.01M coating agent (sodium polyacrylate, sodium dodecyl sulfate (SDS), CTAB, PVP, PVA, TOAB, mercaptan) , stirred for 2min. Add 0.5 mL of 0.075% (wt%) NaBH with a syringe 4 , stirred for 5 min, the color of the solution changed rapidly from colorless to red. The UV-Vis absorption curve of the gold colloidal system was determined. Protect from light, store in refrigerator at 5°C.

[0040] (2) Preparation of gold nanoparticles (taking sodium polyacrylate as an example, the method of other encapsulation agents is the same):

[0041] Measure 1L of double-distilled water and add it to the micro-nano bubble generator, then add 100mL of 0.01M sodium polyacrylate, vacuumize for 3min, and pass in Ar (or N 2 ) to return to normal pressure...

Embodiment 6

[0043] Embodiment 6 Seed first addition method prepares gold nanoparticle

[0044] (1) Preparation of gold seeds, see step (1) in Example 5.

[0045] (2) Preparation of gold nanoparticles (taking sodium polyacrylate as an example, the method of other encapsulation agents is the same):

[0046] Measure 1L of double distilled water into the micro-nano bubble generator, then add 100mL of 0.01M sodium polyacrylate, vacuumize for 3min, and pass in Ar or N 2 Return to normal pressure, repeat 2 to 3 times. Turn on the micro-nano bubble generator and feed in H 2 1min to produce micro-nano hydrogen bubble water. Measure 1mL of HAuCl 4 Add it into a 150mL Erlenmeyer flask, under magnetic stirring, add 5mL gold seeds using a syringe, stir for 0.5h, then add 100mL of newly prepared micro-nano hydrogen bubble water, stir for 0.5h, and store the reaction mixture in a 20°C incubator in the dark.

[0047] The UV-Vis absorption curve of the sample was measured.

[0048] The ultraviolet-v...

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Abstract

The invention discloses a method for preparing gold nanoparticles. Under the anaerobic condition and at the room temperature, micro-nano hydrogen bubbles are used as reducing agent to reduce chloroauric acid, gold seeds are added, and a seed growth method is adopted to conduct reaction and preparation to obtain the gold nanoparticles. The preparation condition is moderate, the reaction is easy to amplify, new impurities are not led in the gold nanoparticles, the diameters of the gold nanoparticles are small, and uniformity is good.

Description

technical field [0001] The invention relates to a preparation method of gold nanoparticles. Background technique [0002] Due to its unique quantum size effect, volume effect, surface effect, macroscopic quantum tunneling effect and biological effect, gold nanoparticles are often used in clinical medicine, catalysis, electronic devices, optics, sensors, biology and other fields. At present, the commonly used methods for preparing gold nanoparticles include chemical reduction method, electrochemical method, microemulsion method, seed growth method and so on. The chemical reduction method is to add a reducing agent to the precursor solution to reduce the gold salt to gold atoms, and then aggregate to form gold nanoparticles. The study found that gold nanoparticles with different sizes and shapes can be prepared by using different reducing agents and encapsulating agents. Frens (reference: G..Frens.ControlledNucleationfortheRegulationoftheParticleSizeinMonodisperseGoldSuspens...

Claims

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Application Information

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IPC IPC(8): B22F9/26
Inventor 马士禹张云艳张彩荣吴善超温赞伟曹淑妍吴雪梅刘珍杰
Owner EAST CHINA NORMAL UNIV
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