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Composite nano-zinc oxide material and its preparation method

A nano-zinc oxide, morphological technology, applied in zinc oxide/zinc hydroxide, nanotechnology and other directions, can solve the problems of improvement, low field enhancement factor, unfavorable field emission performance, etc., and achieves simple preparation process, good repeatability, improved Effects of Field Emission Properties

Inactive Publication Date: 2012-06-13
EAST CHINA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the field enhancement factor ( β ) is low, which is not conducive to the further improvement of field emission performance

Method used

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  • Composite nano-zinc oxide material and its preparation method
  • Composite nano-zinc oxide material and its preparation method
  • Composite nano-zinc oxide material and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] The ratios mentioned below are molar ratios. Zn(NO 3 ) 2 ·6H 2 O: F127=250:1, Zn(NO 3 ) 2 ·6H 2 O: HMT = 1: 1, Zn(NO 3 ) 2 ·6H 2 O, F127, and HMT were placed in deionized water and stirred until they were evenly mixed; the FTO glass substrate coated with ZnO seed crystals (film thickness 200nm) was suspended in the above solution upside down; the reaction temperature was controlled at 95°C, and the growth time was 8h; After taking out the sample, wash it with deionized water and absolute ethanol respectively, and dry it at 60°C; put the product in a muffle furnace, raise the temperature to 450°C at a rate of 1°C / min, and keep it for 30min.

Embodiment 2

[0028] Zn(NO 3 ) 2 ·6H 2 O: F127=10:1, Zn(NO 3 ) 2 ·6H 2 O: HMT = 1: 1, put the above three substances into deionized water and stir until they are evenly mixed; invert and suspend the FTO glass substrate coated with ZnO seed crystals (the film thickness is 200nm) in the above solution; control the reaction The temperature was 95°C, and the growth time was 16 hours; the samples were taken out and rinsed with deionized water and absolute ethanol respectively, and dried at 60°C; the product was placed in a muffle furnace, and the temperature was raised to 450°C at a rate of 1°C / min. Keep warm for 30min. The XRD photo of the product is as figure 1 As shown, the electron microscope photos are as figure 2 shown. This product can significantly improve the field enhancement factor, such as image 3 shown.

Embodiment

[0030] Zn(NO 3 ) 2 ·6H 2 O: F127=5:1, Zn(NO 3 ) 2 ·6H 2 O: HMT = 1: 1, put the three substances into deionized water and stir until they are evenly mixed; put the FTO glass substrate coated with ZnO seed crystals (the film thickness is 200nm) upside down and suspend in the above solution; control the reaction temperature The temperature is 105°C, and the growth time is 24h; after taking out the sample, rinse it with deionized water and absolute ethanol, and dry it at 60°C; put the product in a muffle furnace, raise the temperature to 450°C at a rate of 2°C / min, and keep it warm 60min.

[0031] Example 4

[0032] Zn(NO 3 ) 2 ·6H 2 O: F127=10:1, Zn(NO 3 ) 2 ·6H 2 O: HMT = 1: 2, put the above three substances into deionized water and stir until they are evenly mixed; invert and suspend the FTO glass substrate coated with ZnO seed crystal (coating film thickness is 200nm) in the above solution; control the reaction The temperature was 95°C, and the growth time was 20 ...

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Abstract

The invention application discloses a preparation method of a material with zinc oxide nanoneedles generated at the top of a zinc oxide (ZnO) nanorod array. The method comprises: adding ZnNO3.6H2O and hexamethylenetetramine (HMT) into a block type polyether Pluronic-F127 surfactant so as to obtain a precursor solution; suspending a substrate coated with ZnO seed crystals in the above solution invertedly, conducting sealing, then placing the solution into a baking oven at a temperature of 90-110DEG C for 1-50h, and leaving the solution to cool naturally; subjecting the obtained sample to washing by deionized water and absolute alcohol, then carrying out drying and calcination at a temperature of 450DEG C, thus obtaining a finished product. In the invention, a solution method that is easy to realize and simple to operate is employed to prepare a ZnO nanostructure with a special appearance. In the structure, the nanorods have a diameter of 100-200nm, and a length-diameter ratio of 30-40, while the top nanoneedles have a diameter of 20-40nm and a length-diameter ratio of 2-110. The method of the invention has the advantages of low preparation cost, simple operation process, good repeatability, short reaction period, and adjustable appearance.

Description

technical field [0001] The present invention relates to a nano-zinc oxide material in a composite form and a preparation method thereof, in particular to a material in which a ZnO nano-needle structure is formed at the top of a ZnO nanorod array and a preparation method thereof. Background technique [0002] ZnO is a very important wide bandgap semiconductor compound (3.37eV), which has very important application value in the fields of blue-green light-emitting diodes, lasers, piezoelectric materials, chemical sensors, photocatalysis and photoelectric conversion. The one-dimensional ZnO nanoarray structure has unique physical properties, chemical properties (such as extremely low thermal expansion coefficient, high thermal stability, large exciton binding energy, negative electron affinity, etc.) and its one-dimensional The low spatial dimension of the structure and the characteristics of single crystal make it have very broad application prospects in many fields such as ult...

Claims

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Application Information

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IPC IPC(8): C01G9/02B82Y40/00
Inventor 李春忠王玉辉顾锋邵玮
Owner EAST CHINA UNIV OF SCI & TECH
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