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Method for preparing silicon dioxide cladding silver-doped zinc oxide nano crystal

A silicon dioxide, silver zinc oxide technology, applied in the direction of silicon dioxide, silicon oxide, nanostructure manufacturing, etc., can solve problems such as difficult to achieve, difficult to uniformly disperse, etc., to achieve the effect of reducing defects, less agglomeration, and enhancing ultraviolet emission

Inactive Publication Date: 2011-11-23
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

ZnO has extremely strong doping unipolarity and is naturally n-type, however, p-type doping is difficult to achieve
Doping Ag ions can realize p-type nano-ZnO, but ZnO:Ag has a strong surface polarity and is not easy to disperse uniformly in organic media, resulting in the agglomeration of nano-powders still exists.

Method used

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  • Method for preparing silicon dioxide cladding silver-doped zinc oxide nano crystal
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  • Method for preparing silicon dioxide cladding silver-doped zinc oxide nano crystal

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] a. Get 18ml Triton X-100 (surfactant) and place it in a small beaker, then add 75ml hexanaphthene (continuous phase) successively, 18ml n-hexanol (co-stabilizer) and 1ml water (discontinuous phase), Stir for 20 minutes to prepare a reverse microemulsion, then add 4ml, 0.25mol / L zinc nitrate solution, 120μL, 0.25mol / L silver nitrate solution, and stir for 30 minutes to obtain microemulsion I.

[0019] b. Get 18ml Triton X-100 (surfactant) and place it in a small beaker, then add 75ml hexanaphthene (continuous phase) successively, 18ml n-hexanol (co-stabilizer) and 1ml water (discontinuous phase), Stir for 20 minutes to prepare a reverse-phase microemulsion, then add 10ml, 1mol / L sodium hydroxide solution, stir for 30 minutes to obtain microemulsion II, mix and react microemulsion I and II for 12 hours to prepare Ag + Doped [Zn(OH) 4 ] 2- Precursor;

[0020] c. To the Ag prepared in (b) + Doped [Zn(OH) 4 ] 2- Add 200 μL of tetraethyl orthosilicate to the precursor, ...

Embodiment 2

[0022] a. Get 18ml Triton X-100 (surfactant) and place it in a small beaker, then add 75ml hexanaphthene (continuous phase) successively, 18ml n-hexanol (co-stabilizer) and 1ml water (discontinuous phase), Stir for 20 minutes to prepare a reverse microemulsion, then add 4ml, 0.25mol / L zinc nitrate solution, 120μL, 0.25mol / L silver nitrate solution, and stir for 30 minutes to obtain microemulsion I.

[0023] b. Get 18ml Triton X-100 (surfactant) and place it in a small beaker, then add 75ml hexanaphthene (continuous phase) successively, 18ml n-hexanol (co-stabilizer) and 1ml water (discontinuous phase), Stir for 20 minutes to prepare a reverse-phase microemulsion, then add 10ml, 1mol / L sodium hydroxide solution, stir for 30 minutes to obtain microemulsion II, mix and react microemulsion I and II for 12 hours to prepare Ag + Doped [Zn(OH) 4 ] 2- Precursor;

[0024] c. To the Ag prepared in (b) + Doped [Zn(OH) 4 ] 2- Add 500 μL of tetraethyl orthosilicate to the precursor, ...

Embodiment 3

[0026] a. Get 18ml Triton X-100 (surfactant) and place it in a small beaker, then add 75ml hexanaphthene (continuous phase) successively, 18ml n-hexanol (co-stabilizer) and 1ml water (discontinuous phase), Stir for 20 minutes to prepare a reverse microemulsion, then add 4ml, 0.25mol / L zinc nitrate solution, 120μL, 0.25mol / L silver nitrate solution, and stir for 30 minutes to obtain microemulsion I.

[0027] b. Get 18ml Triton X-100 (surfactant) and place it in a small beaker, then add 75ml hexanaphthene (continuous phase) successively, 18ml n-hexanol (co-stabilizer) and 1ml water (discontinuous phase), Stir for 20 minutes to prepare a reverse-phase microemulsion, then add 10ml, 1mol / L sodium hydroxide solution, stir for 30 minutes to obtain microemulsion II, mix and react microemulsion I and II for 12 hours to prepare Ag + Doped [Zn(OH) 4 ] 2- Precursor;

[0028] c. To the Ag prepared in (b) + Doped [Zn(OH) 4 ] 2- Add 1000 μL of tetraethyl orthosilicate to the precursor,...

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Abstract

The invention relates to a method for preparing a silicon dioxide cladding silver-doped zinc oxide nano crystal, which belongs to the technical field of composite nano microcrystal materials. A kernel of a product is a silver-doped zinc oxide nano rod, and the surface of the silver-doped zinc oxide nano rod is cladded with silicon dioxide. The preparation method comprises the following steps of: firstly, preparing Zn<2+>:Ag<+> microemulsion and NaOH microemulsion by adopting and utilizing a reverse microemulsion system of a cyclohexane / Triton X-100 / hexanol / aqueous solution, carrying out mixing reaction on the Zn<2+>:Ag<+> microemulsion and the NaOH microemulsion for a period of time and generating Ag<+>-doped [Zn(OH)4]2-precursor; then adding a certain amount of tetraethyl orthosilicate and ammonia water into the precursor by utilizing an alloplasm flocculating method; and stirring for a period of time, washing and drying to obtain the silicon dioxide cladding silver-doped zinc oxide nano crystal. The product obtained by the invention has uniform dispersion, good stability and less agglomeration and can be applied to the fields of biological recognition, medicament separation, biological tracing, and the like.

Description

technical field [0001] The invention relates to a method for preparing silicon dioxide-coated silver-doped zinc oxide nanocrystals, belonging to the technical field of composite nanocrystal materials Background technique [0002] Zinc oxide (ZnO) is a wide bandgap direct bandgap compound semiconductor material with high exciton binding energy, and is an ideal material for preparing short-wavelength and high-efficiency optoelectronic devices. To realize the wide application of ZnO in the field of optoelectronics, it is first necessary to obtain n-type and p-type materials with good properties. ZnO has extremely strong doping unipolarity and is naturally n-type. However, p-type doping is difficult to achieve. Doping Ag ions can realize p-type nano-ZnO, but ZnO:Ag has a strong surface polarity and is not easy to disperse uniformly in organic media, resulting in the agglomeration of nano-powders still exists. Therefore, surface modification of nano-ZnO:Ag powder has become a n...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B33/12C01G9/02B82B3/00
Inventor 李冬梅姚亚玲熊婷婷徐天胜傅腾飞
Owner SHANGHAI UNIV
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