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Preparation method of self-assembled superlattice materials of titanium dioxide nano rod

A technology of titanium dioxide and nanorods, applied in the fields of titanium dioxide, chemical instruments and methods, titanium oxide/hydroxide, etc.

Inactive Publication Date: 2010-01-06
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Although Onsager's pioneering work and many subsequent theoretical simulations have predicted that a series of nano-superstructures can be formed through the self-assembly between one-dimensional anisotropic components, so far, there are still only a few successful reports in the literature. Through this self-assembled superlattice material, they were limited to nanorods of these nine substances—BaCrO 4 , CdSe, CdS, CdSe / CdS, ZnO, CoO, Co, Au, Ag

Method used

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  • Preparation method of self-assembled superlattice materials of titanium dioxide nano rod
  • Preparation method of self-assembled superlattice materials of titanium dioxide nano rod
  • Preparation method of self-assembled superlattice materials of titanium dioxide nano rod

Examples

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Embodiment 1

[0023] Example 1: Whole TiO 2 The synthesis reaction was carried out in an anhydrous and oxygen-free Schlenk apparatus. First, a mixture of 4 ml of oleic acid (Aldrich, purity 95%) and 5 ml of octadecene (Aldrich, purity 97%) was stirred and heated at 100° C. for 1 hour to remove residual water and oxygen. Then 0.3 ml of n-butyl titanate (Aldrich, purity 99%) was injected into the above mixture and kept at 100° C. for 20 minutes. After 20 minutes, the temperature of the synthesis apparatus was raised to 260° C. and kept there for 10 minutes. Then 2 mL of oleylamine (Aldrich, 98% purity) was injected rapidly and the solution was vigorously stirred for 1.5 hours. After the solution is cooled, add 6 ml of a mixture of n-hexane and acetone with a volume ratio of 1:1 to precipitate TiO 2 Nanorod flocculent precipitation, and then centrifuged at 4000 rpm to obtain yellow TiO 2 nanorods, the TiO 2 Can be dispersed in non-polar solvents (such as n-hexane, toluene, etc.) to form a...

Embodiment 2

[0024] Embodiment 2: Synthetic TiO 2 The process of the nanorods is the same as in Example 1. Subsequent addition of pure oleic acid volume: TiO 2 When the solution volume is about 1:5, the concentration of oleic acid in the final solution is about 5.2×10 -4 In the case of mol / mL, the slow evaporation of the solvent can be obtained as image 3 The Ribbon structure shown.

Embodiment 3

[0025] Embodiment 3: Synthetic TiO 2 The process of the nanorods is the same as in Example 1. Subsequent addition of pure oleic acid volume: TiO 2 When the solution volume is about 1.5:5, the concentration of oleic acid in the final solution is about 7.8×10 -4 mol / ml, by slow evaporation of the solvent can be obtained as Figure 4The ribbon-shaped (Ribbon) structure and the honeycomb (Honeycomb) structure coexisting situation shown.

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Abstract

The invention discloses a preparation method of self-assembled superlattice materials of a titanium dioxide nano rod, comprising the following steps: (1) monodispersed TiO2 nano rods are synthetized, and the synthetic reaction is based on a condition that an unstable hydroxy derivative is produced by oleic acid titanium under nucleophillic attack of oil amide, the hydroxy derivative can be further polymerized to generate Ti-o-Ti, and produced TiO2 nano sticks are dispersed to a non-polar solvent to make clear TiO2 solution; (2) superfluous oil acid surface activators are added into the solution, and the superlattice materials with different structures (riband shapes and beehive shapes) are made by controlling the concentration of the oil acid in the solution and evaporating slow solvents. The invention has the advantages of firstly expanding the preparation scope of one-dimensional superlattice materials to the TiO2 nano rods of anatase, utilizing superfluous oil acid surface active agent to lead depletion attraction to adjacent TiO2 nano sticks, thereby adding macro-control factors for self-assembled drive force of the nano sticks so as to enable the self-assembled behavior to be easily generated.

Description

technical field [0001] The invention relates to a preparation method of titanium dioxide nanorod self-assembled superlattice material. It utilizes the strategy of introducing depletion attraction force with excess surfactant to induce uniform size of TiO 2 Nanorods self-assemble to form superlattice materials with different structures. Background technique [0002] In the current nanocrystalline superlattice prepared by nanoparticles, its constituent units are mainly limited to spherical quantum dots, such as rare metals, semiconductors and magnetic quantum dots. This kind of quantum dot superlattice, in addition to maintaining the original characteristics of nanoparticles, has some special properties that nanoparticles do not have due to the coupling between quantum dots, and may be found in the fields of light, electricity, magnetism, etc. important application. A new trend in the preparation of nanocrystalline superlattices in the past one or two years is to expand fro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G23/053B01F3/12
Inventor 王智宇叶波钱国栋樊先平
Owner ZHEJIANG UNIV
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