Method for preparing fluoresent carbon nanoparticles

Abstract

The invention relates to a method for preparing fluoresent carbon nanoparticles. The method has a main process that a triblock copolymer P123 is taken as a structure-directing agent, tetraethyl orthosilicate is taken as a silicon source, oil-soluble small organic molecule, o-phenylenediamine (DAB), pyrene (PY) and phenanthroline (PHA) are taken as swelling agents as well as a carbon source of target fluorescent carbon granules, and a swelling agnet / P123 / silicon dioxide composite material is synthetized in an acid aqueous solution system; then, the material is put in a tube furnace to be calcinated under the protection of inert gases, the calcination temperature is 900 DEG C and the calcination time is 2 hours; and after the material is cooled to the room temperature, silicon dioxide component in the powder is removed through etching, the powder is also subjected to nitrification and passivation treatment, and water-soluble monodispersion fluorescent carbon particles are obtained finally. The product adopts a surfactant P123 as a soft template and mesoporous silica as a hard template at the same time, and the obtained fluorescent particles have good dispersibility and stability.

Description

technical field [0001] The invention relates to a method for preparing fluorescent carbon nanoparticles from bottom to top by adopting a soft-hard template route, and belongs to the technical field of nano functional carbon material preparation technology. Background technique [0002] Fluorescent carbon-based nanomaterials, including carbon nanotubes, carbon dots, and nanodiamonds, have developed rapidly as a new type of fluorescent material. Compared with semiconductor quantum dots, it has the advantages of higher fluorescence quantum yield, stable chemical composition, good biocompatibility and low cytotoxicity. As soon as the appearance of fluorescent carbon-based nanomaterials, it immediately attracted chemists, The great enthusiasm and attention of materials scientists and biologists have initially demonstrated excellent quality in the fields of life sciences such as biological imaging, disease detection and medicine. [0003] Regarding the current development status,...

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Problems solved by technology

However, most synthetic routes such as hydrothermal method, microwave method, and oxidation method are prone to agglomeration of carbon particles due to high temperature during the preparation process.

More importantly, the discussion on the preparation method of fluorescent carbon particles in the current reports is only limited to one point, that is, only examining the fluorescent carbon particles obtained from a certain carbon source under a specific synthesis condition, the composition, size Parameters affecting the fluorescence properties such as size and degree of graphitization were not explored

Here, through the soft-hard template method, the micelles formed by surfactants are used as soft templates, and the central hydrophobic region serves as a confinement space for hydrophobic small organic molecules, while the silica on the periphery of the micelles provides It has a good confinement space, effectively controls the aggregation of carbon dots, and synthesizes fluorescent carbon particles with controllable size, adjustable components and degree of graphitization, and good dispersion. This method has not been reported yet.

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