A method, device and application of batch and controllable preparation of graphitic carbon-coated metal/metal oxide nanoparticles

Abstract

The present invention relates to a batch and controllable method, device and application for preparing graphite carbon-coated metal / metal oxide nanoparticles. The method uses dopamine hydrochloride dispersed in Tris buffer solution to process metal / metal oxide nanoparticles Coating by polymerization, followed by centrifugation and vacuum drying to prepare dopamine-coated metal / metal oxide nanomaterials; The carbon-coated metal / metal oxide prepared above is subjected to targeted heating to catalyze the graphitization conversion of the carbon layer in a fluidized bed to obtain graphitic carbon-coated metal / metal oxide nanomaterials. The graphitic carbon-coated metal / metal oxide nanomaterial obtained in the present invention has uniform appearance, high purity, and good monodispersity; high yield and efficiency, relatively low cost, relatively simple reaction device; and can realize large-scale preparation , with industrial prospects.

Description

technical field [0001] The invention belongs to a method for preparing graphite carbon-coated metal / metal oxide nanoparticles, and particularly relates to a controllable shape and size that can be applied to the fields of catalytic materials, biomedicine, magnetic recording materials, electrode materials, etc. A series of methods for preparing carbon-coated metal / metal oxide nanoparticles. Background technique [0002] The information disclosed in this background section is only intended to increase the understanding of the general background of the present invention, and is not necessarily taken as an acknowledgment or any form of suggestion that the information constitutes the prior art already known to those skilled in the art. [0003] Carbon-coated nanometer metal / metal oxide is a new type of functional composite material with a core-shell structure. The cladding shell layer is an amorphous carbon structure or a multilayer graphite layer structure, and the inner core i...

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Problems solved by technology

[0004] Among them, the arc discharge method is the earliest and commonly used method. It is a method of preparing a mixed anode composed of graphite and target-coated metal element or metal oxide by arc discharge evaporation under vacuum or inert atmosphere. The reaction conditions are relatively harsh, the yield is low, it is difficult to control the structure of the product, and there are many by-products that are difficult to avoid

Methods such as chemical vapor deposition, pyrolysis, and high-temperature carbonization are similar in nature. They all carbonize and deposit carbon-containing substances on the surface of metal particles at high temperatures to complete the coating process. The difference is the type and type of metal source and carbon source. state, the preparation process is greatly constrained by raw materials and reaction conditions, and the product is inevitably accompanied by a large number of by-products (such as carbon nanotubes, carbon nanocages, and carbon atom cluster impurities such as amorphous carbon), which cannot achieve large-scale production

The sol-gel method and the hydrothermal method have outstanding advantages in improving product yield and purity, regulating particle size and morphology, and the preparation process also has the characteristics of relatively simple equipment, mild reaction conditions, and easy control, but the inventors found that: Due to the low reaction temperature, the carbon shell is mainly composed of amorphous carbon, with a low degree of graphitization and poor thermal and chemical stability.

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