ZnO luminous nanoparticles synthesized in polyethylene glycol and preparation method thereof

A nanoparticle and polyethylene glycol technology, applied in the field of nanomaterials, can solve problems such as unsatisfactory stability and limited application, and achieve the effects of simple and efficient preparation method, stable luminescence properties, and stable composition and structure.

Inactive Publication Date: 2012-01-18
FUDAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In addition, there are reports in the literature that coating SiO on the surface of ZnO 2 Or a PMMA shell to improve its stability, but the products obtained are often microspheres with a size of several hundred nanometers or even several microns, in which a lot of ZnO nanoparticles are wrapped, which limits the application in biomedicine due to the size being too large, and These microspheres are suspended in water, the stability is not ideal

Method used

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  • ZnO luminous nanoparticles synthesized in polyethylene glycol and preparation method thereof
  • ZnO luminous nanoparticles synthesized in polyethylene glycol and preparation method thereof
  • ZnO luminous nanoparticles synthesized in polyethylene glycol and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Example 1 2.2 g of Zn(Ac) 2 2H 2 O and 0.63g of LiOH·H 2 Add O to 100 mL of triethylene glycol (TEG), and use high-speed stirring to help dissolve. At this time, the concentration of zinc acetate is 0.1M, and the molar ratio of lithium hydroxide [LiOH] / [Zn 2＋]=1. After reacting at room temperature for 48 hours, ethyl acetate was used as a precipitating agent to obtain a gel of ZnO nanoparticles. After washing the residual mother liquor with ethyl acetate, the ZnO nanoparticle gel was dissolved in a small amount of ethanol, and after complete dissolution, the ZnO nanoparticle was precipitated again with ethyl acetate to obtain pure ZnO nanoparticle. The determination of quantum efficiency adopts rhodamine 6G (quantum efficiency 95%) dissolved in ethanol solution as a benchmark.

[0025] The method utilizes TEG to protect the surface of ZnO and obtains stable ZnO nanoparticles. Under base-catalyzed, air-oxidized conditions, TEG derivatives have been modified onto t...

Embodiment 2

[0026] Example 2 The preparation method is the same as in Example 1, the concentration of zinc acetate in the reaction system is still 0.1 M, but the feed ratio R=1.5 of lithium hydroxide and zinc acetate, and other conditions remain unchanged, finally obtaining ZnO with a luminous wavelength of 511 nanometers and a quantum efficiency of 26 %.

Embodiment 3

[0027] Example 3 The preparation method is the same as in Example 1, the concentration of zinc acetate in the reaction system is still 0.1 M, but the feed ratio R=2 of lithium hydroxide and zinc acetate, and other conditions remain unchanged, finally obtaining ZnO with a luminous wavelength of 482 nanometers and a quantum efficiency of 25 %.

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Abstract

The invention belongs to the technical field of nano-materials, and particularly relates to ZnO luminous nanoparticles synthesized in polyethylene glycol and a preparation method thereof. The nanoparticles consist of ZnO monocrystal particles and external polymer radicals, and have high stability and photoluminescence performance. The preparation method comprises the following steps of: dissolving zinc acetate and basic hydroxide in a solvent together with stirring; and reacting at the room temperature for a period of time. The ZnO luminous nanoparticles can be purified by adopting a non-solvent precipitation method. In the stirring reaction process, a reaction mixture is fully contacted with the air, polyethylene glycol is oxidized by the air to form a carboxylic acid anion structure under the alkali catalyzing condition, and carboxylic acid anions can be coordinated onto the surfaces of the ZnO nanoparticles to make the ZnO nanoparticles illuminate stably. The preparation method has the advantages of low cost, environmental friendliness and high yield.

Description

technical field [0001] The invention belongs to the technical field of nanometer materials, and in particular relates to a ZnO luminescent nanoparticle and a preparation method thereof. Background technique [0002] Nano-metal materials were successfully developed in the 1980s. Later, semiconductors, ceramics, molecular sieves, and organic-inorganic hybrid materials with nano-size and nano-structure came out one after another. Nanotechnology, which has emerged since the early 1990s, has brought new changes in many fields such as information, energy, transportation, medicine, food, textiles, and environmental protection. Therefore, nanomaterials have become a research field that has an important impact on future economic and social development in new material science, and it is also the most active, innovative and application-oriented field in contemporary basic research. Among them, ZnO nanomaterials have shown great potential in ultraviolet laser, bioluminescent labeling a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/54
Inventor 熊焕明马日照
Owner FUDAN UNIV
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