Nanometer luminescent core-shell zinc oxide-polymer particle and its prepn
A nanoparticle and polymer technology, applied in the field of nanomaterials, can solve the problems of poor composite stability, material properties decline, weak binding force, etc., and achieve the effect of stable physical properties.
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[0024] Example 1
[0025] Dissolve 4.66 g of zinc methacrylate in 200 mL of ethanol and reflux for 3 hours at 80°C to obtain a colorless and transparent solution, in which the zinc salt concentration is about 0.1 mol / L; dissolve 5 g of lithium hydroxide in 500 mL of ethanol, and stir vigorously at high speed Help dissolve, filter out the insoluble matter to obtain a colorless and transparent LiOH solution with a concentration of about 0.2mol / L. Use EDTA and oxalic acid standard solutions to titrate the exact concentrations of zinc methacrylate and lithium hydroxide respectively. Then, the obtained zinc methacrylate and lithium hydroxide ethanol solution were in accordance with the molar ratio [Zn 2+] / [LiOH]=3.5 mixed. After the mixture was reacted at room temperature for 8 hours, most of the solvent was evaporated in a rotary evaporator, and the evaporation was stopped when white turbidity appeared. The turbid solution was cooled at 4°C for 1 hour and then centrifuged, the superna...
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[0027] Example 2
[0028] The preparation method is the same as in Example 1, but the reaction time of zinc methacrylate and lithium hydroxide ethanol solution at room temperature is extended to 100 hours, and other conditions remain unchanged. Finally, the average diameter of ZnO is 4.6 nm and the polymer shell thickness is 2 nm. product. The emission wavelength moves to 500 nanometers, and the quantum efficiency is 30%.
Example Embodiment
[0029] Example 3
[0030] The preparation method is the same as in Example 1, but the reaction time of zinc methacrylate and lithium hydroxide ethanol solution at room temperature is extended to 48 hours, dispersed in methyl methacrylate and circulating water bath at 60°C for 20 minutes, and finally ZnO average A product with a diameter of 2.8 nm and a polymer shell thickness of 7 nm. The emission wavelength moves to 480 nanometers, and the quantum efficiency is 50%.
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