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Microwave method for synthesizing blossom ZnO hierarchical nanostructure

A nano-structure and flower-cluster-like technology, applied in the field of graded nano-structure, can solve the problems of high reaction temperature and long reaction time, and achieve the effects of good repeatability, improved selectivity and easy industrialization.

Inactive Publication Date: 2010-08-25
JIANGSU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, these methods generally require higher reaction temperatures and longer reaction times

Method used

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  • Microwave method for synthesizing blossom ZnO hierarchical nanostructure
  • Microwave method for synthesizing blossom ZnO hierarchical nanostructure
  • Microwave method for synthesizing blossom ZnO hierarchical nanostructure

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] 1. Weigh 0.225g of precursor, add it to 20mL of ethylenediamine, and ultrasonically dissolve it completely to form a precursor solution.

[0030] 2. Transfer the solution to a round-bottomed flask, put it into a microwave reactor, heat and reflux at 110°C for 5 minutes with a heating power of 450W, and then cool to room temperature.

[0031] 3. Use a high-speed centrifuge to centrifuge the mixture in the round bottom flask, remove the upper clear layer, wash the precipitate repeatedly with water, and then wash it with absolute ethanol until the clear liquid is colorless, dry it in an oven, and collect product.

Embodiment 2

[0033] (1)Zn(acac) 2 ·H 2 The synthesis of O precursor is the same as in Example 1

[0034] (2) Preparation of ZnO nanomaterials

[0035] 1. Weigh 0.225g of precursor, add it to 20mL of ethylenediamine, and ultrasonically dissolve it completely to form a precursor solution.

[0036] 2. Transfer the solution to a round bottom flask, put it into a microwave reactor, heat and reflux at 110°C for 10min, with a heating power of 450W, and then cool to room temperature.

[0037] 3. Use a high-speed centrifuge to centrifuge the mixture in the round bottom flask, remove the upper clear layer, wash the precipitate repeatedly with water, and then wash it with absolute ethanol until the clear liquid is colorless, dry it in an oven, and collect product. The XRD pattern of this experimental example is as follows figure 2 as shown, image 3 As the SEM image of the product, it can be observed that the sample is composed of regular flower cluster structures. Figure 4 The structure of ...

Embodiment 3

[0039] (1)Zn(acac) 2 ·H 2 The synthesis of O precursor is the same as in Example 1

[0040] (2) Preparation of ZnO nanomaterials

[0041] 1. Weigh 0.225g of precursor, add it to 20mL of ethylenediamine, and ultrasonically dissolve it completely to form a precursor solution.

[0042] 2. Transfer the solution to a round-bottomed flask, put it into a microwave reactor, heat and reflux at 110°C for 15 minutes with a heating power of 450W, and then cool to room temperature.

[0043] 3. Use a high-speed centrifuge to centrifuge the mixture in the round bottom flask, remove the upper clear layer, wash the precipitate repeatedly with water, and then wash it with absolute ethanol until the clear liquid is colorless, dry it in an oven, and collect product.

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Abstract

The invention provides a method for preparing a blossom ZnO hierarchical nanostructure by using microwave to decompose single-source precursor, belonging to the field of nano material preparation. The method is that precursor Zn (acac) 2.H2O (acac refers to acetylacetonate anion) for ZnO preparation is synthesized first, then the precursor is dissolved in quadrol and finally a microwave reactor is used to heat and decompose precursor solution to obtain the blossom ZnO nanostructure. A ZnO blossom is a hierarchical structure: ZnO nano rods (primary structure) with diameter of 20-30nm are assembled into nano rod clusters (secondary structure) with diameter of 400-600nm first and then the nano rod clusters are assembled into the ZnO blossom (tertiary structure). The invention has the advantages of simple technology, convenient operation, high speed and high efficiency and good repetitiveness.

Description

technical field [0001] The invention relates to decomposing a single-source precursor by a microwave method to prepare flower-clustered ZnO grade nanostructures, belonging to the field of nanomaterial preparation. Background technique [0002] ZnO is a wide bandgap II-VI semiconductor compound with a bandgap width of 3.37eV and an exciton binding energy as high as 60meV at room temperature. Due to its unique physical and chemical properties, ZnO has been widely used in industrial production, such as in ceramics, rubber additives, pigments, varistors, chemical sensors, and cosmetics. Recently, nanostructured ZnO has attracted intense interest due to its novel properties, such as ultraviolet light emission, piezoelectric effect, and photocatalytic properties, and its potential applications in nano-optoelectronic devices. So far, a variety of ZnO nanostructures have been prepared, such as granular, linear, flowery, needle, rod, tube, ribbon, ring, comb, sheet, and tetragonal, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G9/02B82B3/00
Inventor 沈小平孙吉全郭丽君
Owner JIANGSU UNIV
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