Preparation method of highlight blue-green fluorescent water soluble silicon quantum dot

Abstract

The invention provides a preparation method of a highlight blue-green fluorescent water soluble silicon quantum dot. The highlight blue-green fluorescent water soluble silicon quantum dot is synthesized through one step at normal pressure by adopting a high boiling point water soluble reagent glycerol as a solvent and utilizing a microwave method. The preparation method of the highlight blue-green fluorescent water soluble silicon quantum dot comprises the following steps: adding sodium citrate into glycerol, and dissolving thoroughly; introducing Ar gas for removing oxygen in a solution, then adding 3-aminopropyl triethoxy silane, and continuously stirring while the Ar gas is introduced; transferring the solution into a microwave reactor, and reacting for 5-15 minutes at the temperature of 160-200 DEG C; adding the obtained silicon quantum dot solution into absolute ethyl alcohol, centrifuging, and reserving supernatant; and dialyzing the supernatant by adopting a dialysis bag, so as to obtain a pure silicon quantum dot solution, and carrying out freeze drying on the pure quantum dot solution for later use. The preparation method of the highlight blue-green fluorescent water soluble silicon quantum dot has the advantages that synthesis is realized through one step at normal pressure by adopting the microwave method, a synthetic process is simple and easy to operate, and the synthesized water soluble silicon quantum dot has the advantages of long emission wavelength, high luminous intensity, good fluorescent stability, low cytotoxicity and good biocompatibility.

Description

technical field [0001] The invention belongs to the technical field of nanomaterial preparation, and in particular relates to a method for preparing water-soluble silicon quantum dots with high brightness blue-green fluorescence. Background technique [0002] Silicon quantum dots are a novel fluorescent nanomaterial, which has the advantages of low toxicity, cheap and easy-to-obtain raw materials, easy modification, high fluorescence intensity, strong photostability, high pH stability, good water solubility and biocompatibility. At present, the research on silicon quantum dots is mainly focused on its synthesis method, and the simplification of synthesis conditions and the optimization of the optical properties of the synthesized silicon quantum dots are the directions of current research. [0003] At present, the methods for preparing water-soluble silicon quantum dots by one-pot method mainly include hydrothermal synthesis method and microwave synthesis method, and the sol...

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Problems solved by technology

It can be seen that the hydrothermal synthesis method takes a long time, and the silicon quantum dots prepared at the same time have a short emission wavelength (~448nm)

Lee, S.T. (J.Am.Chem.Soc.2013,135,8350-8356) used microwave method to rapidly synthesize water-soluble silicon quantum dots with high fluorescence brightness within 15min at 160°C, but the reaction was realized under high pressure , and the emission wavelength is also shorter, the same blue light at 460nm

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