Graphene oxide quantum dot with controllable fluorescence color and preparation method thereof
A graphene quantum dot and fluorescence technology, applied in graphene, chemical instruments and methods, inorganic chemistry, etc., can solve the problems of unsuitable mass production, cumbersome preparation process, uncontrollable luminescence color, etc.
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Embodiment 1
[0021] Add 100 mg of graphene oxide in 10 mL of deionized aqueous solution into a 100 mL round bottom flask, then add 10 mL of tetrahydrofuran and 3 g of acetylacetone, heat to 75 ° C under reflux and stir, and stop the reaction after 6 h. After the reaction solution is cooled, centrifuge the reaction mixture at a centrifugal rate of 6000 to 8000 r / min, take the supernatant and rotary evaporate to remove tetrahydrofuran and excess acetylacetone to obtain an aqueous solution of graphene oxide quantum dots modified by acetylacetone, and use 0.22μm microporous membrane filtration, recorded as acac-GOQDs1. The as-prepared acac-GOQDs were demonstrated to have a particle size of about 18-40nm, and its HRTEM was as follows: figure 1 (a) shown. The acac-GOQDs aqueous solution showed strong blue fluorescence under ultraviolet light excitation, and the fluorescence emission spectra under different wavelengths of light excitation were as follows: figure 2 (a) shown. The absolute fluo...
Embodiment 2
[0023] Added 100 mg of graphene oxide in 10 mL of deionized aqueous solution into a 100 mL round bottom flask, then added 10 mL of tetrahydrofuran and 1.5 g of cyanoacetic acid, heated to 50 ° C under reflux and stirred, and stopped the reaction after 5 h. After the reaction solution is cooled, centrifuge the reaction mixture at a centrifugal rate of 6000-8000r / min, take the supernatant and rotary evaporate to remove tetrahydrofuran, and filter it with a 0.22μm microporous membrane to obtain cyanoacetic acid-modified graphene oxide The quantum dot aqueous solution is denoted as cyac-GOQDs1. The prepared cyac-GOQDs were characterized and found that the particle size was around 20-50nm, and its HRTEM was as follows: figure 1 (b) shown. The cyac-GOQDs aqueous solution shows orange-red fluorescence under ultraviolet light excitation, and the fluorescence emission spectra under different wavelength light excitation are as follows: figure 2 (b) shown. The absolute fluorescence q...
Embodiment 3
[0025] Add 15 mL of deionized aqueous solution containing 100 mg of graphene oxide into a 100 mL round-bottomed flask, then add 15 mL of tetrahydrofuran and 1 g of acetylacetone, heat to 60° C. under reflux and stir, and stop the reaction after 7 hours. After the reaction solution is cooled, centrifuge the reaction mixture at a centrifugal rate of 6000-8000r / min, take the supernatant and rotary evaporate to remove tetrahydrofuran, and filter it with a 0.22μm microporous membrane to obtain cyanoacetic acid-modified graphene oxide The quantum dot aqueous solution is denoted as acac-GOQDs2. According to the method described in Example 1, the prepared target product was characterized and measured for performance evaluation by fluorescence emission spectrum.
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