Method for preparing carbon quantum dot-doped sodium borosilicate glass material

Abstract

The invention relates to a method of preparing a carbon quantum dot-doped sodium borosilicate glass material. The method comprises the following steps: (1) by adopting ethyl orthosilicate, boric acid and metal sodium as precursors, proportioning the following components in percentage by mass of 5-15% of Na2O, 15-30% of B2O3 and 55-80% of SiO2 to form cracking-free and complete sodium borosilicate dry gel by virtue of a sol-gel method, heating the sodium borosilicate dry gel to 400-470 DEG C in a tubular furnace under O2 atmosphere, carrying out heat preservation for more than 10 hours until the organic substances are completely removed and cooling to obtain a porous sodium borosilicate glass dry gel; (2) immersing the porous sodium borosilicate glass dry gel prepared in the step (1) in a solution of carbon quantum dot, soaking at room temperature, preserving for 6-24 hours, taking out, drying for 10-24 hours at 60-90 DEG C, placing dried porous sodium borosilicate glass dry gel in the tubular furnace, heating to 550-650 DEG C under N2 atmosphere at a heating rate of 10-30 DEG C / h, densifying, carrying out heat preservation for 10-30 hours, naturally cooling to room temperature, closing N2 to obtain the carbon quantum dot-doped sodium borosilicate glass material, wherein solvents for the solution of carbon quantum dot is toluene, ethanol or n-hexane so that the size of the carbon quantum dot is smaller than that of the porous carbon sodium borosilicate dry glue.

Description

technical field [0001] The invention relates to the field of inorganic functional composite materials, in particular to a method for preparing a sodium borosilicate glass material doped with carbon quantum dots. Background technique [0002] A rookie in the family of carbon nanomaterials—Carbon Quantum Dots (CDs for short) is a class of elements composed of carbon, hydrogen, oxygen, nitrogen, etc. 2 Hybrid carbon-based quasi-spherical carbon nanoparticles with a large number of oxygen-containing groups on the surface and a particle size of less than 10 nanometers. In addition to the incomparable advantages of high carrier mobility, good thermal / chemical stability, environmental friendliness, and low price, it has been found that CDs materials are resistant to photobleaching and easy to function compared with traditional semiconductor quantum dot materials. Chemical, low toxicity, mild reaction conditions, and also has adjustable excitation wavelength and emission wavelength...

AI Technical Summary

Problems solved by technology

However, there are still few studies on doping carbon quantum dots into solid materials, and there are no reports on the application of carbon quantum dot glass in the LED field.

[0004] There have been some reports in the literature on the preparation of metal-containing (such as Ag) or metal sulfides (such as PbS or In 2 S 3 ) quantum dots of sodium borosilicate glass, but generally the precursor compound of the dopant is mixed into the sodium borosilicate sol, and then dried to obtain a dry glue, and then the final product is obtained through an atmosphere-controlled heat treatment. This method is complicated to operate. The experiment period is long, and when heat treatment removes organic impurities in the glass matrix, oxygen needs to be introduced, which will lead to carbonization failure of carbon quantum dots under high temperature conditions

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