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Surface-modified ZnO quantum dot and preparation method thereof

A surface modification, quantum dot technology, applied in chemical instruments and methods, luminescent materials, etc., can solve the problems of low luminous intensity, narrow light-emitting wavelength adjustment range, poor stability, etc., achieve low cost, improve adjustability, High stability effect

Inactive Publication Date: 2012-07-04
TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the reported ZnO quantum dots have low luminous intensity and poor stability, and the luminous wavelength adjustment range in the visible light region is very narrow.

Method used

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  • Surface-modified ZnO quantum dot and preparation method thereof
  • Surface-modified ZnO quantum dot and preparation method thereof
  • Surface-modified ZnO quantum dot and preparation method thereof

Examples

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Effect test

Embodiment 1

[0036] Add 0.439g of zinc acetate dihydrate into 20mL of absolute ethanol under magnetic stirring, heat to 80°C, condense and reflux for 2 hours to obtain a 0.1mol / L zinc acetate ethanol solution;

[0037] The zinc acetate ethanol solution was pre-cooled to 0°C, then 0.293 g of silane coupling agent was added, and magnetically stirred for 60 min to obtain a zinc acetate ethanol solution stabilized by the silane coupling agent.

[0038] Add 0.0839g of lithium hydroxide monohydrate into 20mL of ethanol, and ultrasonically dissolve to obtain a lithium hydroxide ethanol solution with a concentration of 0.1mol / L;

[0039] Lithium hydroxide ethanol solution was added to the zinc acetate ethanol solution stabilized by the silane coupling agent, and magnetically stirred for 30 minutes to obtain the colorless and transparent ZnO quantum dots surface-modified by the silane coupling agent in this example. The average particle diameter of the ZnO quantum dot is 3nm, and the position of th...

Embodiment 2

[0042] Add 0.439g of zinc acetate dihydrate into 20mL of absolute ethanol under magnetic stirring, heat to 80°C, condense and reflux for 5 hours to obtain a 0.1mol / L zinc acetate ethanol solution;

[0043] The zinc acetate ethanol solution was pre-cooled to 0°C, then 0.6 g of silane coupling agent was added, and magnetically stirred for 15 minutes to obtain a zinc acetate ethanol solution stabilized by the silane coupling agent.

[0044] Add 0.1175g of lithium hydroxide monohydrate into 20mL of ethanol, and ultrasonically dissolve to obtain a lithium hydroxide ethanol solution with a concentration of 0.14mol / L;

[0045] Lithium hydroxide ethanol solution was added to the zinc acetate ethanol solution stabilized by the silane coupling agent, and magnetically stirred for 30 minutes to obtain the colorless and transparent ZnO quantum dots surface-modified by the silane coupling agent in this example. The average particle size of the ZnO quantum dot is 2nm, and the position of the...

Embodiment 3

[0047] Add 0.439g of zinc acetate dihydrate into 20mL of absolute ethanol under magnetic stirring, heat to 80°C and reflux for 1 hour to obtain a 0.1mol / L zinc acetate ethanol solution;

[0048] The zinc acetate ethanol solution was pre-cooled to 0°C, then 1.75 g of silane coupling agent was added, and magnetically stirred for 30 min to obtain a zinc acetate ethanol solution stabilized by the silane coupling agent.

[0049] Add 0.2937g of lithium hydroxide monohydrate into 20mL of ethanol, and ultrasonically dissolve to obtain a lithium hydroxide ethanol solution with a concentration of 0.35mol / L;

[0050] Lithium hydroxide ethanol solution was added to the zinc acetate ethanol solution stabilized by the silane coupling agent, and magnetically stirred for 30 minutes to obtain the colorless and transparent ZnO quantum dots surface-modified by the silane coupling agent in this example. The average particle diameter of the ZnO quantum dot is 1nm, and the position of the fluoresce...

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Abstract

The invention relates to surface-modified ZnO quantum dots, which are surface modified by utilizing a silicane coupling agent. A preparation method of the ZnO quantum dots comprises the steps of: firstly preparing a zinc acetate ethanol solution stabilized by the silicane coupling agent, adding the silicane coupling agent and magnetically stirring to obtain a zinc acetate ethanol solution stabilized by the silicane coupling agent; then preparing lithium hydroxide ethanol solution; adding the lithium hydroxide ethanol solution into the zinc acetate ethanol solution stabilized by the silicane coupling agent and magnetically stirring to obtain the colorless transparent silicane coupling agent surface-modified ZnO quantum dots. The quantum dots have the characteristics of high fluorescence intensity and good stability and have the advantages that: the fluorescence emission wavelength of the surface-modified ZnO quantum dots can be adjusted and is nontoxic and the preparation method is simple in process, low in cost and suitable for realizing industrial production.

Description

technical field [0001] The present invention relates to a ZnO quantum dot and its preparation method, in particular to a surface-modified ZnO quantum dot and its preparation method, more specifically, the present invention relates to an Surface-modified ZnO quantum dots with tunable wavelength and preparation method thereof. Background technique [0002] When the semiconductor material is gradually reduced from the bulk phase to a certain critical size, the characteristic size of the material is comparable to or smaller than the De Broglie wave or the mean free path of the electron in three dimensions, and the movement of electrons in the material is limited by three dimensions. , that is to say, the energy of electrons is quantized in three dimensions, and we call this kind of material in which electrons are restricted in three dimensions quantum dots. [0003] The study of semiconductor quantum dots is an emerging field in solid luminescent materials, involving the inters...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/54
Inventor 付绍云史汉桥李婉男肖红梅杨娇萍
Owner TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI
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