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Method for preparing bare metal cluster ions based on laser dissociation

A technology of metal clusters and metal ions, applied in metal processing equipment, nanotechnology for materials and surface science, nanotechnology, etc., can solve complex, difficult to achieve liquid phase preparation methods, and difficult to produce multi-charged bare gaseous metals Cluster ions and other problems, to achieve the effect of simple preparation method

Inactive Publication Date: 2020-04-07
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

Due to their high reactivity, gaseous metal cluster molecules can only exist stably in vacuum or inert atmosphere, which is difficult to achieve by conventional liquid phase preparation methods.
Furthermore, the above devices for generating bare gaseous metal clusters usually require complex device construction, and it is difficult to generate multiply charged bare gaseous metal cluster ions

Method used

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  • Method for preparing bare metal cluster ions based on laser dissociation
  • Method for preparing bare metal cluster ions based on laser dissociation
  • Method for preparing bare metal cluster ions based on laser dissociation

Examples

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Embodiment Construction

[0015] 1. Au 25 (PPh 3 ) 10 (SPh) 5 Cl 2 For the preparation of gaseous gold cluster molecules

[0016] Synthesized and purified from triphenylphosphine (PPh) based on solution preparation method 3 ), benzenethiol (SPh) and chloride-protected Au 25 cluster molecules. The cluster molecules were dissolved in a mixed solvent of 90% methanol / 10% water (volume ratio) with a mass concentration of 1 mg / mL, and centrifuged at 25000 g for 5 min to remove insoluble impurities. The gold cluster solution was placed into a syringe at a flow rate of 300 nL / min, and injected into the electrospray capillary for ionization. The capillary electrospray voltage was set at 1.2 kV. The vacuum degree of the vacuum system is 5×10 -5 bar, background gas is 99.999% N 2 . Using 193nm laser for Au 25 Cluster ions were dissociated at high energy to prepare gaseous gold cluster ions, the laser energy was 2mJ, and the laser frequency was 20Hz. The gaseous gold cluster ions produced were analyze...

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Abstract

The invention relates to a method and a device for preparing ligand-protection-free bare metal cluster ions from metal cluster molecules based on laser dissociation ligand protection. The method is characterized in that cluster molecules containing peripheral protection ligands and metal cores are introduced into a vacuum system through an electrospray ionization method, then laser is used for bombarding metal cluster ions in a gas phase, and therefore bare metal cluster ions with different atomic numbers are generated. The method is rapid, simple, efficient and stable, and a brand-new effective means is provided for preparation of the metal cluster ions.

Description

technical field [0001] The invention relates to a method for preparing metal cluster molecules, and more specifically, to a method for preparing gaseous metal cluster molecules based on laser dissociation. Background technique [0002] Metal clusters are a class of structural materials consisting of several to hundreds of atoms with a size less than 2nm. Due to their high surface atomic ratio and unique electronic hierarchical structure, metal clusters exhibit excellent optical, electrical and chemical properties, and have great application prospects in the fields of industrial catalysis, biological analysis, environmental monitoring and electronic devices. [0003] The common preparation method of metal cluster molecules is usually prepared by reducing metal ions with a reducing agent in a solution containing organic ligands, using metal ions as raw materials. The size and structure of the metal cluster molecules prepared by this method are related to the types of organic ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/64B82Y30/00B22F9/14B22F1/00
CPCG01N27/64B82Y30/00B22F9/14B22F1/054
Inventor 王方军刘哲益肖春雷李杲
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI