Method for Batch Synthesis of Water-dispersed Small Size Ultra-Long Near Infrared Afterglow Nanoparticles

Abstract

The invention relates to a method for synthesizing water-dispersed small-particle size ultra-long near-infrared afterglow nanoparticles in batch. The method is characterized in that the long afterglownanoparticles after high-temperature calcination are synthesized in batch by adopting a method for hydrothermal post-treatment with a metal complexing agent solution. The method comprises the following steps: 1) uniformly mixing metal nitrate in proportion, synthesizing nanoparticles through hydrothermal or solvothermal treatment and then calcining at a temperature of 750-1200 DED C; 2) dispersing a product in the step 1) in the metal complexing agent solution, adding alkali, adjusting to the alkalinity and stirring at a room temperature; 3) transferring mixed liquid in the step 2) into a reaction kettle and reacting for 18-72 hours at a temperature of 180-220 DEG C; and 4) performing suspension centrifugation after reaction, and washing and drying a product. The method provided by the invention has the advantages that each of the nanoparticles obtained has a particle size of 5-30 nanometers and an afterglow time of 15-30 days, is dispersed in water for 12-72 hours and has a luminescent wavelength of longer than 685 nanometers; the method is simple and easy to operate, and the obtained product is high in water dispersibility, small in particle size, ultra-long in afterglow and suitable for large-scale application to anti-counterfeiting ink, biomedical sensing and imaging, 3D printing materials and the like.

Description

technical field [0001] The invention relates to the synthesis technology of long afterglow nanoparticles, in particular to the post-treatment method of long afterglow nanoparticles calcined at high temperature. Background technique [0002] Long afterglow luminescent materials refer to materials that can continue to emit light after the material stops being excited, so they are also called light-storing luminescent materials and luminescent materials. Long glow material is essentially a photoluminescent material, but compared with general luminescent materials, the afterglow time is as long as several hours to dozens of days. Although long afterglow materials were discovered as early as the 17th century, their preparation technology is immature, and the principle of luminescence has not been understood, which limits the wide application of long afterglow materials. Since the synthesis of green luminescent long afterglow material SrAl in 1996 2 o 4 : Since Eu, Dy, long aft...

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Problems solved by technology

The traditional high-temperature calcination method requires grinding and particle size separation before it can be applied to biomedical imaging, but this method has low yield and poor water dispersibility of the material

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