Preparation method for gold cluster

Abstract

The present invention discloses a preparation method for a gold cluster. The method comprises the following steps that: a gold film is plated on a substrate by evaporation plating; a matrix is coated on the surface of the gold film; the gold film is bombarded by laser to obtain the product. With the preparation method of the present invention, a series of the gold clusters can be obtained, wherein the positive ion mass charge ratio of the gold cluster is 20,000, the negative ion mass charge ratio of the gold cluster is 10,000. The present invention further provides a method for conveniently producing the gold cluster positive ions with the wide mass charge ratio range and the gold cluster negative ions with the wide mass charge ratio range by gold film gasification, wherein the gold film is directly gasified by directly using the laser carried by the mass spectrometer. According to the method of the present invention, the substrate and the gold film can be reused, and the prepared gold clusters can be used for researches of structures, catalytic reactions, mass spectrometry mass calibrations, and the like of the gold cluster.

Description

technical field [0001] The invention relates to a method for preparing gold clusters, which belongs to the technical field of metal cluster preparation. Background technique [0002] Clusters refer to relatively stable aggregates composed of several to hundreds or even tens of thousands of atoms or molecules combined together. It is the transition state between single atoms and macroscopic solids. Clusters have many special properties different from single atoms and macroscopic solids in physics and chemistry, and have a wide range of potential applications. They are currently being used by researchers to develop a variety of high-sensitivity and high-sensitivity Selective new methods of analysis and detection. [0003] Among the many types of cluster particles, gold clusters have more unique physical and chemical properties, and have unique applications in catalytic reactions, high-sensitivity sensor development, mass spectrometry and other fields. Existing studies have ...

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Problems solved by technology

[0004] At present, gold clusters are prepared by magnetron sputtering, laser sputtering ultrasonic molecular beam cooling, dual laser evaporation and laser direct gasification, among which the gold clusters produced by magnetron sputtering are relatively large, and the number of gold atoms can reach several Hundreds, but the equipment is complicated; laser sputtering ultrasonic molecular beam cooling can also produce gold clusters with hundreds of atoms, but because of the introduction of high-pressure gas, the vacuum control of the system is difficult, and the application remains unchanged; double laser evaporation method can get 100 gold clusters The number of gold clusters below the atom is relatively limited; the equipment of laser direct gasification technology is relatively simple, but the number of gold clusters generated is relatively limited, even if combined with chemical principles, such as chloroauric acid and 2-(4-hydroxyl Oxenazole) benzoic acid mixture, with the help of matrix-assisted laser analysis, can only obtain cluster positive ions of no more than 100 gold atoms, and cannot obtain negative ion gold clusters.

In summary, there is currently no relatively simple method to prepare gold cluster cations and negative ions of different masses (especially mass gradients) according to needs.

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