Universal method for controllably preparing nano particles on graphene sheet

Abstract

The invention relates to a universal method for controllably preparing nano particles on a graphene sheet. The method comprises the steps of selecting a graphite oxide colloidal aqueous solution and a high-purity Ag target, suspending the Ag target in the graphite oxide colloidal solution, ceaselessly mixing the colloidal aqueous solution with a magnetic mixer, irradiating the target with a laser, and regulating the density and dimensions of the Ag nano particles by changing irradiation time and laser power. The method overcomes the defects that the application of graphene or graphite oxide is limited due to nonuniform distribution of the nano particles prepared by a chemical method on the sheet, additives are required to result in sample contamination, instruments are expensive, the preparation cost is high, and large-scale preparation cannot be achieved when a physical method is used for preparing a graphene based composite. The invention provides a liquid laser ablation method, The graphene based composite can be prepared no matter functional groups are available on the graphene sheet, a technology is simple, the synthetic quantity is large, and the method is green and environment-friendly and can be popularized and used in the industrial field.

Description

technical field [0001] The invention belongs to the field of preparation of graphene-based composite nanomaterials, in particular to a liquid-phase laser ablation method, that is, a universal method for controllably preparing nanoparticles on graphene sheets. Background technique [0002] Graphene-based composite materials can take advantage of the respective advantages of graphene and the composite nanomaterials as well as the synergistic effect of the two. For example, the composite SERS substrate of graphene and noble metal nanoparticles can utilize both the chemical reinforcement of graphene and the physical reinforcement of noble metals. The combined and synergistic effects of graphene (graphene can prevent the oxidation of noble metals and improve the stability of Raman signals, etc.), is expected to be widely used in the field of trace detection. [0003] Before the present invention was made, the commonly used processes for growing nanoparticles on graphene sheets we...

AI Technical Summary

Problems solved by technology

Chemical methods must be realized on the basis of functional groups (such as hydroxyl groups, carboxyl groups, etc.) or defects on the surface of graphene sheets, and the uneven distribution of the two leads to uneven distribution of nanoparticles on the sheet, thus greatly limiting graphene or oxidation. The application of graphene in fields such as batteries and supercapacitors (the presence of functional groups leads to a decrease in the conductivity of graphene, and graphene with good conductivity and no functional groups cannot be synthesized)

In addition, chemical preparation of graphene-based composites usually requires additives, which inevitably causes sample contamination.

The equipment used in the physical method is expensive, the preparation cost is high, and it cannot be prepared in large quantities, which also limits its application in the industrial field

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