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Method for preparing sub-nano golden cluster molecule
Inactive Publication Date: 2009-08-12
ZHEJIANG UNIV
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However, these semiconductorquantum dots are toxic and not biocompatible, and must undergo complex and cumbersome surface chemical treatments to be dispersed in aqueous solutions and biocompatible.
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Embodiment 1
[0017] Step 1: Add 125 mL of 1 mM HAuCl to a 250 mL round bottom flask 4 Aqueous solution, in N 2 Under protection, heat to boiling, quickly add 12.5mL 10mM sodium citrate aqueous solution, continue heating for 10min, remove the heating mantle, continue stirring for 5min, cool to room temperature, and obtain a purple-red particle-shaped gold nanocrystal solution.
[0018] Step 2: 1 mL 10 -3 M particle-shaped gold nanocrystals were mixed with 1 mL of 1 mM histidine, and reacted for 30 min under ultrasonic and normal temperature conditions.
[0019] Step 3: After the reaction is over, centrifuge to remove the suspension and precipitate, and collect the clear solution to obtain the sub-nano gold cluster molecule Au 8 .
Embodiment 2
[0021] Step 1: Add 125 mL of 1 mM HAuCl to a 250 mL round bottom flask 4 Aqueous solution, in N 2 Under protection, heat to boiling, quickly add 12.5mL 20mM sodium citrate aqueous solution, continue heating for 10min, remove the heating mantle, continue stirring for 20min, cool to room temperature, and obtain a purple-red particle-shaped gold nanocrystal solution.
[0022] Step 2: 1 mL 10 -3 After mixing the gold nanocrystals in the form of M particles with 1 mL of 10 mM mercaptoethylamine, they were stirred and reacted for 1 hour at room temperature.
[0023] Step 3: After the reaction is over, centrifuge to remove the suspension and precipitate, and collect the clear solution to obtain the sub-nano gold cluster molecule Au 8 .
Embodiment 3
[0025] Step 1: Add 125 mL of 1 mM HAuCl to a 250 mL round bottom flask 4 Aqueous solution, in N 2 Under protection, heat to boiling, quickly add 12.5mL 30mM sodium citrate aqueous solution, continue heating for 10min, remove the heating mantle, continue stirring for 15min, cool to room temperature, and obtain a purple-red particle-shaped gold nanocrystal solution.
[0026] Step 2: 1 mL 10 -3 M particle-shaped gold nanocrystals were mixed with 1 mL of 100 mM asparagine, and reacted for 2 hours under ultrasonic and normal temperature conditions.
[0027] Step 3: After the reaction is over, centrifuge to remove the suspension and precipitate, and collect the clear solution to obtain the sub-nano gold cluster molecule Au 8 .
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Abstract
The invention relates to a method for preparing a sub-nanometer gold cluster molecule. The purification of the prior part is complex. The method of the invention firstly uses chloroauric acid as raw material and adopts a solution method for synthesizing a gold nanometer crystal solution. Then, the gold nanometer crystal solution and amine solution with the molar concentration of 1mM-10M are mixed and react for more than 30min. After the reaction is finished, the centrifugal separation is carried out on the solution to obtain sub-nanometer gold cluster molecular solution. The sub-nanometer gold cluster molecule obtained by the method is monodispersed Au8 cluster molecule. Only common centrifugation is required for separating other impurities. The purification mode is simple.
Description
technical field [0001] The invention belongs to the technical field of materials, and relates to a method for preparing subnanometer gold cluster molecules, in particular to a method for preparing subnanometer gold cluster molecules by using gold nanocrystals and organic amine molecules as reactants. Background technique [0002] Gold nanocrystals (gold nanocrystals) have been widely used in many fields due to their biocompatibility. Based on its properties such as high electron density and surface plasmon enhancement, colloidal gold or various gold nanocrystals are used for biological labeling, biological detection, and tumor treatment. However, since the Fermi level of the metal is in the middle of the energy band, usually the gold nanocrystals do not emit light or the luminous efficiency is very low. Recently, semiconductorquantum dots represented by chalcogenides have been applied to biological labeling and biological imaging. However, these semiconductorquantum dots...
Claims
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