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.

Inactive Publication Date: 2006-05-17
FUDAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although such physical mixing is easy to operate and is suitable for industrial production, its disadvantages are obvious, that is, the binding force of the two components is relatively weak, the stability of the formed complex is poor, and the two-phase separation of the polymer and the nanomaterial will occur after long-term storage. Phenomenon of decay of material properties

Method used

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  • Nanometer luminescent core-shell zinc oxide-polymer particle and its prepn
  • Nanometer luminescent core-shell zinc oxide-polymer particle and its prepn
  • Nanometer luminescent core-shell zinc oxide-polymer particle and its prepn

Examples

Experimental program
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Effect test

Embodiment 1

[0025] Dissolve 4.66g of zinc methacrylate in 200mL of ethanol, and reflux at 80°C for 3 hours to obtain a colorless and transparent solution, in which the concentration of zinc salt is about 0.1mol / L; dissolve 5g of lithium hydroxide in 500mL of ethanol, and stir vigorously at high speed To help dissolve, filter out the insolubles 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 resulting zinc methacrylate and lithium hydroxide ethanol solution were prepared according to the molar ratio [Zn 2+] / [LiOH]=3.5 mixed. After the mixed solution 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 above cloudy solution was cooled at 4° C. for 1 hour and then centrifuged. After the s...

Embodiment 2

[0028] The preparation method is the same as in Example 1, but the reaction time of zinc methacrylate and lithium hydroxide ethanol solution is extended to 100 hours at room temperature, and other conditions are unchanged, and finally the ZnO average diameter is 4.6 nanometers, and the thickness of the polymer shell is 2 nanometers. product. The emission wavelength is shifted to 500 nanometers, and the quantum efficiency is 30%.

Embodiment 3

[0030] The preparation method is the same as in Example 1, but the reaction time of zinc methacrylate and lithium hydroxide ethanol solution is extended to 48 hours at room temperature, dispersed in methyl methacrylate and circulated in a water bath at 60 ° C for 20 minutes, and finally the ZnO average A product with a diameter of 2.8 nm and a polymer shell thickness of 7 nm. The emission wavelength is shifted to 480 nm, and the quantum efficiency is 50%.

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Abstract

The present invention relates to nanometer material technology, and is especially covalent bond formed nanometer luminescent zinc oxide-polymer particle in core-shell structure and its preparation process. The nanometer particle has nanometer size ZnO monocrystal as core and thin nanometer size polymer layer as shell and these two components are connected via covalent bond with high stability. The material as one new type of compound has fixed smelting point, dissolubility, conductivity, viscosity, etc. It has the type, composition and size of both core and shell capable of being controlled via chemical reaction, and thus controllable physical performance. What is more important is that the material as new type of luminescent material has light emitting wavelength, strength, quantum efficiency and other parameters capable of being altered via chemical preparation.

Description

technical field [0001] The invention belongs to the technical field of nanometer materials, and in particular relates to a "zinc oxide-polymer" core-shell type luminescent nanoparticle and a preparation method thereof. Background technique [0002] The 21st century is full of opportunities and challenges. With the rapid development of information, energy, environment, and national defense, the demand for materials is advancing day by day. The miniaturization and intelligence of devices require the size of materials to be smaller and smaller. Therefore, nanomaterials have become a research object that has an important impact on future economic and social development in the field of new material research, and is also the most active and closest application field in contemporary basic research. Today's nanomaterials research is no longer limited to simple quantum dots, one-dimensional nanorods, nanobelts, nanotubes, and complex two-dimensional and three-dimensional structural m...

Claims

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Application Information

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IPC IPC(8): C09K11/00C08F292/00
Inventor 熊焕明夏永姚
Owner FUDAN UNIV
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