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Preparation method of ZnO nanocrystals

A nanocrystal, 2·6H2O technology, applied in nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc., can solve the problems of complex operation, harsh conditions, expensive equipment, etc., and achieve simple operation process, reaction Low temperature, easy to scale effect

Inactive Publication Date: 2013-03-06
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Among the above methods, the high-temperature physical vapor deposition method has harsh conditions, complicated operation, and expensive instruments; the template-induced method has the problems of complicated template preparation process and easy destruction of the original nanostructure of the product when removing the template; The size of the product is large, the particle size distribution is not easy to control, and the product is not easy to elute; so they are difficult to achieve large-scale production of ZnO nanomaterials

Method used

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  • Preparation method of ZnO nanocrystals
  • Preparation method of ZnO nanocrystals
  • Preparation method of ZnO nanocrystals

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Example 1, adjusting the concentration of precursors to prepare ZnO nanocrystals

[0028] Weigh 1.190g (4mmol) of Zn(NO 3 ) 2 ·6H 2 O and 0.561g (4mmol) of HMT (hexamethylenetetramine), add in the small beaker, measure 20mL deionized water and add in the beaker, then put the magnet into the small beaker, stir for 0.5h to make the solution well mixed. Pipette 10mL, 2.5mL, 1mL and 0.15mL of the precursor solution from the above beakers with a pipette gun, and add them to the four beakers respectively. Then add solvent ethanol to the four beakers in turn, so that the solvents all contain 10 mL of water and 20 mL of ethanol. Put the four beakers into a digitally controlled ultrasonic cleaner, put them in an ultrasonic bath for 0.5h, and then transfer them to four polytetrafluoroethylene reaction kettles in turn. Set the oven temperature to 100°C, put the reactor into it, and control the reaction time to 24h. After the reaction, the reactor was taken out and cooled nat...

Embodiment 2

[0030] Embodiment 2, control reaction time prepares ZnO nanocrystal

[0031] Weigh 0.476g (1.6mmol) of Zn(NO 3 ) 2 ·6H 2 Add O and 0.224g (1.6mmol) of HMT (hexamethylenetetramine) into a small beaker, measure 80mL of deionized water into it, then put the magnet into the small beaker, and stir for 0.5h to make the solution evenly mixed. Use a pipette gun to pipette 10 mL of the precursor solution from the above beakers and add them to the six beakers respectively. Then add solvents to these six beakers in turn, so that the solvents all contain 10 mL of water and 20 mL of ethanol. Put the six beakers into a digitally controlled ultrasonic cleaner, put them in an ultrasonic bath for 0.5h, and then transfer them to six polytetrafluoroethylene reaction kettles in turn. Set the oven temperature to 100°C, put all the reactors into it, and adjust the reaction time to 1~16h. According to the reaction time, take out the corresponding numbered reactors one by one, and let them cool ...

Embodiment 3

[0033] Embodiment 3, select different solvents to prepare ZnO nanocrystals

[0034] Weigh 2.380g (8mmol) of Zn(NO 3 ) 2 ·6H 2 Add O and 1.121g (8mmol) of HMT (hexamethylenetetramine) into a small beaker, measure 40mL of deionized water into it, then put the magnet into the beaker, and stir for 0.5h to make the solution evenly mixed. Use a pipette gun to pipette 10 mL of the precursor solution from the above beakers and add them to the three beakers respectively. Then add solvents to the three beakers in turn, so that the solvents all contain 10 mL of water and 20 mL of ethanol. Put the three beakers into a digitally controlled ultrasonic cleaner, put them in an ultrasonic bath for 0.5h, and then transfer them to three polytetrafluoroethylene reaction kettles in turn. Set the oven temperature to 150°C, put all the reactors into it, and control the reaction time to 24h. After the reaction, the reactor was taken out and cooled naturally at room temperature. The reaction sol...

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Abstract

The invention discloses a preparation method of ZnO nanocrystals. The method comprises the following steps of: dissolving the mixture between Zn(NO3)2.6H2O and any one of hexamethylene tetramine and NaOH in mixed liquor of water and organic solvent, and carrying out hydrothermal reaction to obtain the ZnO nanocrystals, wherein the mole fraction ratio of Zn(NO3)2.6H2O to hexamethylene tetramine is 1: 1, and the mole fraction ratio of Zn(NO3)2.6H2O to NaOH is 1: (5-20). The preparation method of the ZnO nanocrystals disclosed by the invention has the advantages of being simple in operation technological process, low in raw material price, low in reaction temperature, easy for large-scale production and the like, and some reference basis can be provided for the preparation of ZnO nano-materials and the indusial production of the ZnO nano-materials by the typical hydrothermal reaction. Meanwhile, according to the preparation method, after the test parameters are controlled, the ZnO nanocrystals with different shapes and sizes can be successfully prepared, the controllable synthesis of the ZnO nanocrystals can be realized, and the action mechanism and the crystal growth law of different influencing factors can be expounded.

Description

technical field [0001] The invention relates to a preparation method of ZnO nano crystals, belonging to the technical field of nano materials. Background technique [0002] ZnO is a semiconductor material with direct bandgap and wide bandgap, with a bandgap width of 3.37eV, so ZnO can provide a large driving force for the redox process, and it can be used as a photocatalyst for degrading organic pollutants in water or air. Even in some cases, for the photocatalytic degradation of some dyes, ZnO can show better performance than TiO 2 higher efficiency. The size and morphology of inorganic nanomaterials are important factors in determining their electrical, optical and other properties. Compared with zero-dimensional nanostructures, one-dimensional nanostructures have fewer grain boundaries, surface defects, and dislocations, which can promote effective carrier transport. Therefore, the synthesis of one-dimensional ZnO nanomaterials has attracted great attention, for exampl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G9/02B82Y30/00
Inventor 朱永法刘迪
Owner TSINGHUA UNIV
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