Nano-particle material surface modification method

Abstract

The present invention discloses a nano-particle material surface modification method, which comprises: uniformly dispersing nano-particles with a long chain or non-polar organic ligand coated on the surface in a liquid state compound containing an active polar group, and carrying out a complete reaction at a temperature of 25-200 DEG C in an air or protection atmosphere to obtain the surface-modified nano-particles, wherein the active polar group is at least selected from amino, carboxyl or mercapto. According to the present invention, the short chain compound containing amino, carboxyl, mercapto and other groups, the small molecule aromatic compound or the heterocyclic organic compounds and the like are used to replace the quantum dots, other long alkyl chain organic compound ligands coated on the surface during the nano-particle material preparing process, and the like, such that the hydrophilicity and the electric conductivity can be significantly improved while the morphology and the dispersion property of the nano-particles are maintained; and the method is suitable for various goods and self-preparation of quantum dots or nano-crystal materials in laboratories, and the surface-modified quantum dots and other nano-particle materials are particularly suitable for the photoelectric field.

Description

technical field [0001] The invention relates to a method for preparing nanometer materials, in particular to a method for surface modification of nanoparticle materials, and belongs to the field of material science. Background technique [0002] Quantum dots, that is, semiconductor nanocrystals with a radius smaller than or close to the exciton Bohr radius, are quasi-zero-dimensional nanomaterials composed of a small number of atoms. Due to its special structure, quantum dots exhibit different size and shape-dependent physical properties from the corresponding bulk materials. In addition to the advantages of high specific surface area and high adsorption performance, it is emphatically reflected in its small size effect and quantum size effect. It has been widely used in different scientific and technological fields such as biolabels, light-emitting diodes, lasers, photolytic water splitting, and solar cells due to its special photoelectric response properties. Quantum dot ...

AI Technical Summary

Problems solved by technology

Quantum dot particles themselves have extremely high surface energy, and it is difficult to exist stably alone. Therefore, their surface needs to be wrapped with organic ligands during the preparation and application process. Such organic ligands are usually characterized by containing long alkyl chains. Dot shape control and monodispersion are of great significance, but at the same time, it also makes the surface of quantum dots hydrophobic and insulating, which seriously hinders the application of quantum dot materials in various fields, especially in the field of photoelectrochemistry.

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