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A kind of ag/tio2/zno nanowire with core-shell structure and preparation method thereof

A technology of core-shell structure and nanowires, which is applied in the field of core-shell structure Ag/TiO2/ZnO nanowires and its preparation, can solve the problems of no Ag/TiO, etc., and achieve the effect of improving stability and carrier separation efficiency

Active Publication Date: 2019-06-04
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Literature review results show that there is no Ag / TiO 2 / ZnO one-dimensional core-shell branched nanowire structure and its preparation method report

Method used

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  • A kind of ag/tio2/zno nanowire with core-shell structure and preparation method thereof
  • A kind of ag/tio2/zno nanowire with core-shell structure and preparation method thereof
  • A kind of ag/tio2/zno nanowire with core-shell structure and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] 1) Preparation of Ag nanowires: add 2.93g polyvinylpyrrolidone to 95mL glycerol, stir for 1.5h at 90℃, then stop heating, cool to 50℃, add 0.79g silver nitrate; prepare 29.5mg chlorinated A mixed solution of sodium, 0.25mL deionized water, 5mL glycerol, then add the mixed solution to the container, and then heat to 210℃, react for a total of 40min, stop heating, take out, wash and separate to obtain a diameter of 50-100nm and a length of tens of microns Silver nanowires.

[0028] 2) Disperse 100mg silver nanowires in 40mL ethanol solution, then add 8mg polyvinylpyrrolidone, magnetically stir for 10min, then add 0.4mL tetrabutyl titanate and 0.6mL deionized water dropwise, continue stirring for 30min, deionize Wash with water, disperse in 10mL deionized water, hydrothermally react at 160℃ for 12h to obtain core-shell Ag / TiO 2 Nanowires.

[0029] 3) Add 68.5 mg of zinc acetate to 32 mL of methanol, stir at 60°C for 40 min, then add 16.5 mL of methanol solution containing 27.5...

Embodiment 2

[0033] 1) Same as step (1) of Example 1.

[0034] 2) Disperse 100mg silver nanowires in 40mL ethanol solution, then add 8mg polyvinylpyrrolidone, magnetically stir for 10min, then add 0.4mL tetrabutyl titanate and 0.6mL deionized water dropwise, continue stirring for 30min, deionize Wash with water, disperse in 10mL deionized water, hydrothermally react at 120℃ for 12h to obtain core-shell Ag / TiO 2 Nanowires.

[0035] 3) Same as step (3) of Example 1.

[0036] 4) Transfer the product obtained in step 3) to 30mL aqueous solution containing 0.178g zinc nitrate and 0.084g hexamethylenetetramine, stir and react at 80℃ for 1 h to obtain core-shell Ag / TiO 2 / ZnO nanowires.

[0037] Image 6 The field emission scanning electron microscopy photographs show that Ag / TiO was successfully obtained 2 / ZnO one-dimensional core-shell branched nanowire structure.

Embodiment 3

[0039] 1) Same as step (1) of Example 1.

[0040] 2) Disperse 100mg silver nanowires in 40mL ethanol solution, then add 8mg polyvinylpyrrolidone and magnetically stir for 10min, then add 0.4mL tetrabutyl titanate and 0.6mL deionized water drop by drop, continue stirring for 30min, use deionized water Wash, disperse in 10mL deionized water, hydrothermally react at 200℃ for 8h to obtain core-shell Ag / TiO 2 Nanowires.

[0041] 3) Same as step (3) of Example 1.

[0042] 4) Transfer the product obtained in step 3) to 30mL aqueous solution containing 0.178g zinc nitrate and 0.084g hexamethylenetetramine, and stir for 2h at 90℃ to obtain core-shell Ag / TiO 2 / ZnO nanowires.

[0043] Figure 7 The field emission scanning electron microscopy photographs show that Ag / TiO was successfully obtained 2 / ZnO one-dimensional core-shell branched nanowire structure.

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Abstract

The invention provides core-shell structure Ag / TiO2 / ZnO nanowires, wherein a layer of TiO2 coats Ag nanowires externally and ZnO nanorods are inductively grown on the TiO2 layer. A preparation method includes the steps of: 1) dispersing silver nanowires in ethanol and adding tetrabutyl titanate and deionized water to perform a hydrothermal reaction to produce core-shell structure Ag / TiO2 nanowires; and 2) dispersing the core-shell structure Ag / TiO2 nanowires in zinc oxide sol, uniformly mixing the components and performing washing and separation, and adding the mixture to a mixed water solution of zinc nitrate and hexamethylene tetramine to perform a reaction to obtain the core-shell structure Ag / TiO2 / ZnO nanowires. The method achieves three-phase composition of one-dimensional Ag nanowires with TiO2 and ZnO, so that stability and charge carrier separation efficiency of the material are greatly improved. The photo-catalytic performance of the nanowires is significantly better than that of commercial Degussa P25 nanopowder, so that the nanowires have important application prospect in the fields of environment treatment with photo catalysis and dye-sensitized solar cells.

Description

Technical field [0001] The invention relates to a core-shell structure Ag / TiO 2 / ZnO nanowires and preparation methods thereof are suitable for photocatalysis and dye-sensitized solar cells, belonging to the field of environmental protection energy. Background technique [0002] Semiconductor materials have a wide range of applications in the field of photocatalysis and energy. Among them, TiO 2 And ZnO has received widespread attention because of its low price, simple preparation, good biocompatibility, non-toxicity and harmlessness. However, these two materials have certain disadvantages. For example, their band gap is relatively large and they can only respond to the purple light band. At the same time, their faster photo-generated electron-hole pair recombination rate is not conducive to their photocatalytic performance. [0003] Optimizing nano morphology and introducing heterojunction are two effective modification methods. The one-dimensional nanowire structure can become ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/50H01G9/20C02F1/32C02F101/34
CPCY02E10/542
Inventor 于洋吴进明
Owner ZHEJIANG UNIV
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