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Method for preparing water-soluble gold nano cluster

A gold nano-cluster, water-soluble technology, applied in the field of gold nano-cluster preparation, can solve the problem of low yield of water-soluble gold nano-clusters, and achieve the effects of simple preparation process, high monodispersity, and simple separation process

Inactive Publication Date: 2009-04-15
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to provide a method for preparing water-soluble gold nanoclusters in order to solve the problem of low yield of water-soluble gold nanoclusters with stable mercapto groups

Method used

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  • Method for preparing water-soluble gold nano cluster
  • Method for preparing water-soluble gold nano cluster
  • Method for preparing water-soluble gold nano cluster

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specific Embodiment approach 1

[0010] Embodiment 1: The preparation method of water-soluble gold nanoclusters in this embodiment is as follows: 1. Under the condition that the temperature is -80°C to 15°C, the volume of methanol and Au 3+ The quality of the compound is 1ml: 1 ~ 1000mg ratio of methanol and Au 3+ The compounds are mixed to prepare a mixed solution; 2. Add the aqueous solution of the mercapto organic compound to the mixed solution obtained in step 1 under the condition that the stirring speed is lower than 500 rpm and the stirring time is 0.5 to 8 hours, so that the mercapto organic compound and Au 3+ The molar ratio is 1~20:1; 3. Add concentration of 12mmol / LNaBH under the condition that stirring speed is 800~1600 rpm and stirring time is 0.5~9 hours 4 aqueous solution, and then continue to stir for 0.5 to 12 hours to obtain NaBH 4 with Au 3+ The molar ratio is the mixture of 5-20:1; 4. The mixture obtained in step 3 is centrifugally washed with methanol aqueous solution for 2-5 times, and...

specific Embodiment approach 2

[0012] Specific embodiment two: the difference between this embodiment and specific embodiment one is that the Au described in step one 3+ The compound is chloroauric acid. Others are the same as in the first embodiment.

specific Embodiment approach 3

[0013] Embodiment 3: This embodiment differs from Embodiment 1 in that the mercapto organic compound described in step 2 is a mercapto compound containing carboxylic acid groups and alcoholic hydroxyl groups. Others are the same as in the first embodiment.

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Abstract

The invention discloses a method for preparing a water-soluble gold nanometer cluster, which relates to a method for preparing a gold nanometer cluster. The method solves the problem that the prior production of sulfhydryl stable water-soluble gold nanometer cluster has low yield. The method comprises the following steps: mixing methanol with Au<3+> compound, and adding the methanol and the Au<3+> compound into aqueous solution of sulfhydryl organic substances; and then adding NaBH4 aqueous solution into the aqueous solution of the sulfhydryl organic substances to obtain a mixture, washing the mixture by using methanol aqueous solution and deionized water; and finally, drying the mixture for 6 to 18 hours under the condition that the drying temperature is between 30 and 70 DEG C and the vacuum degree is between 1 and 10<-3> Pa so as to obtain the water-soluble gold nanometer cluster. The particle size of the water-soluble gold nanometer cluster prepared by the method is between 1.3 and 1.7 nanometers, and the distribution rate is nearly 60 percent, thus the water-soluble gold nanometer cluster has relatively high mono-dispersion, and the yield reaching more than 70 percent. The preparation process and the separation process are simple.

Description

technical field [0001] The invention relates to a method for preparing gold nano clusters. Background technique [0002] The zero-dimensional Au nanomaterials below 2nm are called gold nanoclusters, which are composed of a few to more than two hundred gold atoms, and exhibit the same large particle size Au( >2nm) have distinct properties. Because of the small particle size and unique properties of the cluster, it is an excellent low-temperature catalyst for CO oxidation, and the water-soluble gold nanoclusters also have important applications in the biomedical field because they are easy to associate with biological cell tissues. potential. [0003] When the size of gold nanoparticles is 2.5nm, there will be 25% gold Au atoms distributed on the particle surface, when the particle size is less than 2nm, there will be more gold atoms distributed on the surface of its nanoclusters, resulting in a huge surface Effect, this surface effect makes Au nanoclusters very active a...

Claims

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Application Information

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IPC IPC(8): B22F9/24
Inventor 蔡伟王志江隋解和李志国
Owner HARBIN INST OF TECH
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