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Synthetic method of Au19Ag4 alloy nano-cluster with controllable atom number and size

An au19ag4 and synthesis method technology, which is applied in the field of preparation of Au19Ag4 alloy nanoclusters, can solve the problems of difficult structure determination, complicated operation, and difficulty in determining the interaction factors between ligands and metals, and achieves the effects of easy control and simple operation.

Active Publication Date: 2019-06-04
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although there are many types of synthesis, there are still two major problems in the study of alloy clusters: one is that the doped crystal structure will be more complicated, and the structure is difficult to determine; the other is that the factors affecting the interaction between ligands and metals are difficult to determine
[0004] At present, it is still a challenge to control alloy nanoclusters with different sizes and precise atomic numbers; for some nanocluster synthesis methods, the steps are cumbersome and the operation is complicated

Method used

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  • Synthetic method of Au19Ag4 alloy nano-cluster with controllable atom number and size
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  • Synthetic method of Au19Ag4 alloy nano-cluster with controllable atom number and size

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Experimental program
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Embodiment 1

[0014] Example 1: Au 19 Ag 4 Synthesis of nanoclusters

[0015] 50mg of HAuCl 4 .4H 2 O mixed with AgNO 3 Dissolve in 20mL dichloromethane (HAuCl 4 .4H 2 O and AgNO 3 The molar ratio is 1:0.125), add the thiol ligand with a ratio of 5:1 and stir at room temperature for 30 minutes until the reaction solution becomes precipitated, then dissolve 10 mg of sodium borohydride in 1 mL of 4 ° C water, add Reduction in the above solution, the precipitate slowly turned brown. After the reaction was carried out for 1-5 days, the absorption peak of the product was characterized by ultraviolet-visible absorption spectrum, which proved that Au 19 Ag 4 nanoclusters. Finally, the alloy nanocluster is purified, and the product dissolved in dichloromethane is spin-dried, then washed 3 times with methanol, extracted with dichloromethane, and finally spin-dried to obtain the following: figure 1 shown.

Embodiment 2

[0016] Example 2: Synthesis of AuAg Nanoclusters

[0017] 50mg of HAuCl 4 .4H 2 O mixed with AgNO 3 Dissolve in 20mL dichloromethane (HAuCl 4 .4H 2 O and AgNO 3 The molar ratio is 1:0.3, add a thiol ligand with a ratio of 5:1 and stir at room temperature for 30 minutes until the reaction solution becomes precipitated, then dissolve 10 mg of sodium borohydride in 1 mL of 4 ° C water, add the above The solution was reduced, the precipitate slowly turned brown, and the reaction began. After the reaction was carried out for 1-5 days, the absorption peak of the product was characterized by UV-visible absorption spectrum. From the UV-visible absorption spectrum, it can be seen that there is no Au due to the increase of the silver ratio to 0.3:1. 19 Ag 4 The formation of alloy nanoparticles as figure 2 Shown, embodiment 2 prepares the ultraviolet-visible absorption spectrogram of AuAg nanocluster.

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Abstract

The invention discloses a preparation method and application of an Au19Ag4 alloy nano-cluster with controllable atom number and size. The preparation method and application of the Au19Ag4 alloy nano-cluster with controllable atom number and size can be used for synthesizing the AuAg nano-clusters with different sizes on a large scale. The synthetic method specifically comprises the following stepsof firstly dissolving chloroauric acid and silver nitrate in dichloromethane, stirring for a period of time, then adding a ligand for reaction, reacting for 30 minutes, adding sodium borohydride to reduce to obtain zero-valent AuAg alloy nanoparticles, and finally obtaining the Au19Ag4 alloy nano-clusters with the precise atom number along with the addition of the reaction time. The Au19Ag4 alloynano-clusters with different atomic numbers and different sizes can be obtained by adjusting the proportion of gold and silver atoms. The preparation method has the advantages of feasibility and simplicity in operability, and the Au19Ag4 nano-clusters with different sizes are obtained by changing the proportion of gold and silver atoms.

Description

Technical field: [0001] This invention belongs to Au 19 Ag 4 The preparation of alloy nanoclusters, the present invention illustrates the simple preparation of Au with controllable number of atoms and size 19 Ag 4 nanoclusters. Background technique: [0002] In recent years, alloy nanoclusters, as a new member of nanomaterials, have received widespread attention. Because the interaction between atoms changes the electronic structure and surface composition of alloys, the chemical or optical properties of alloy nanoclusters change accordingly, making them It has great application potential in catalysis, sensing, bioimaging, drug delivery, and cancer therapy. [0003] Metal nanoclusters refer to metal particles with a size less than 2nm and have quantum size effects. Generally, they are core-shell structures composed of metals and ligands. The metal acts as the core and the ligand acts as the shell. Or functional groups and other factors to control the physicochemical pro...

Claims

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Application Information

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IPC IPC(8): B22F1/00B22F9/24B82Y40/00
Inventor 黄家辉任秀清刘超林欣章
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI