Upconversion nanocrystalline/titanium dioxide composite nanomaterial and preparation method thereof

A technology of composite nanomaterials and titanium dioxide, applied in chemical instruments and methods, physical/chemical process catalysts, chemical/physical processes, etc., can solve the problem of low overall utilization efficiency of infrared light, large overall size of composite materials, and poor luminous performance and other issues to achieve the effect of light weight, small size and high up-conversion efficiency

Inactive Publication Date: 2014-03-12
ZHEJIANG NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although these materials also exhibit photocatalytic properties in the infrared light band, they have several significant defects: 1. The overall size of the composite material is large (micron scale) and its shape is uneven, which limits its application in many fiel...

Method used

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  • Upconversion nanocrystalline/titanium dioxide composite nanomaterial and preparation method thereof
  • Upconversion nanocrystalline/titanium dioxide composite nanomaterial and preparation method thereof
  • Upconversion nanocrystalline/titanium dioxide composite nanomaterial and preparation method thereof

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specific Embodiment approach （ 1

[0040] An up-conversion nanocrystal / titanium dioxide composite nanomaterial, its chemical expression is: NaYF4:Yb, TmSiO2TiO 2 ; Among them, "" means wrapping.

[0041] A preparation method for upconversion nanocrystal / titanium dioxide composite nanomaterial, comprising the following steps:

[0042] A. High-quality hexagonal NaYF with a size of 20nm 4 : Yb, Tm nanocrystals are the core, and a layer of silica shell is coated on the surface:

[0043] a. In a 10ml glass bottle, mix cyclohexane, IGEPAL CO-520 and ammonia water at a volume ratio of 500:25:4, and shake until clear;

[0044] b. High quality hexagonal NaYF with a size of 20nm 4 : Yb, Tm nanocrystals are dissolved in cyclohexane, the concentration is 0.1 moles per liter, then 200 microliters of the solution is added to the mixed solution formed in the previous step, and shaken evenly;

[0045] c. Add 200 microliters of tetraethyl orthosilicate cyclohexane solution with a concentration of 0.5 moles per liter to the...

specific Embodiment approach （ 2

[0053] On the basis of the specific embodiment (1), only the added amount of diisopropyl di(acetylacetonato)titanate is replaced by 4.5 ml.

specific Embodiment approach （ 3

[0055] On the basis of the specific embodiment (1), only the added amount of diisopropyl di(acetylacetonato)titanate is replaced by 18 ml.

[0056] The data measured under the X-ray powder diffractometer in the above examples are as follows: figure 1 shown. figure 1 The X-ray diffraction data show that the crystallinity of the uncoated sodium tetrafluoroyttrium nanoparticle crystals is very high, which completely corresponds to the peak of the powder crystal diffraction card JCPDS: 16-0334 of the Joint Committee on X-ray Powder Diffraction Standards, indicating that the tetrafluoroethylene used The sodium yttrium fluoride sample is a pure phase without impurities. The product coated with titanium dioxide is annealed and the X-ray powder diffraction data obtained show that in addition to sodium tetrafluoroyttrium crystals, there is anatase titanium dioxide in the product (JCPDS: 21-1272).

[0057] Figure 2~Figure 6 It is the data obtained by characterizing the samples synth...

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Abstract

The invention relates to the technical field of inorganic nano-material preparation, and discloses an upconversion nanocrystalline/titanium dioxide composite nanomaterial and a preparation method thereof. The chemical formula of the upconversion nanocrystalline/titanium dioxide composite nanomaterial is NaYF4:Yb,Tm@SiO2@TiO2, wherein '@' refers to coating. The preparation method of the upconversion nanocrystalline/titanium dioxide composite nanomaterial comprises the following steps: A, using hexagonal phase NaYF4:Yb,Tm nanocrystalline as a nucleus, and coating the surface with a layer of silicon dioxide shell; B, uniformly coating the surface of the silicon dioxide shell with a titanium dioxide shell layer. The preparation method is simple in technology and easy to operate, the prepared upconversion nanocrystalline/titanium dioxide composite nanomaterial is small in size which is even within 50 nm, the structure is uniform, the upconversion efficiency is high, the utilization efficiency of TiO2 on infrared lights can be obviously improved, and the photocatalytic performance is greatly improved.

Description

technical field [0001] The invention relates to the technical field of preparation of inorganic nanomaterials, in particular to an up-conversion nanocrystal / titanium dioxide composite nanomaterial and a preparation method thereof. Background technique [0002] Nano titanium dioxide (TiO 2 ) as a non-toxic, stable, and efficient photocatalyst has been widely used in the fields of life and environmental protection such as coatings, antibacterial agents, water treatment, and pollutant degradation. TiO 2 Under the irradiation of ultraviolet light, the electrons on the valence band jump to the conduction band, generating electron-hole pairs. TiO 2 The electron-hole pairs on the surface can interact with the surrounding water and oxygen to generate oxygen-containing free radicals. These free radicals have super oxidizing ability and can oxidize most organic matter, degrading it into carbon dioxide and water. However, nano-TiO 2 A significant disadvantage of the catalyst is t...

Claims

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Application Information

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IPC IPC(8): B01J27/135
Inventor 李正全苏万奎曾玉斌李聪玲
Owner ZHEJIANG NORMAL UNIVERSITY
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