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Method for electric field assisted preparation of one-dimensional nanometer ZnO crystal whisker

An electric field-assisted and whisker technology is applied in the field of preparing one-dimensional nano-ZnO whiskers, which can solve the problems of complex and difficult control of ZnO whiskers, and achieve the effects of large aspect ratio, simple production equipment and small diameter.

Inactive Publication Date: 2013-09-25
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0011] The technical problem to be solved by the present invention is: in view of the existing technology and research status, the process of preparing ZnO whiskers with large aspect ratio is complicated and difficult to control, here is a preparation of one-dimensional ZnO whiskers with controllable whisker growth method

Method used

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  • Method for electric field assisted preparation of one-dimensional nanometer ZnO crystal whisker
  • Method for electric field assisted preparation of one-dimensional nanometer ZnO crystal whisker
  • Method for electric field assisted preparation of one-dimensional nanometer ZnO crystal whisker

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Embodiment 1

[0036] (1) Preparation of precursor solution:

[0037] Weigh zinc nitrate and hexamethylenetetramine, dissolve in deionized water to prepare a uniform and stable precursor solution. Wherein the concentration of zinc nitrate is 0.001mol / L, and the concentration of hexamethylenetetramine is 0.002mol / L.

[0038] (2) Electric field-guided growth of ZnO whiskers:

[0039] Place the precursor solution obtained in step (1) in a glass beaker and place it on a magnetic stirring heating device with an electric field (temperature: 60°C; electric field strength: 5.0KV m -1 ), after reacting for a period of time (6h), the solid precipitate was separated by centrifugation, and washed several times with distilled water to neutrality, and the obtained powder was dried in a drying oven at 60°C.

[0040] (3) The dried product was subjected to heat treatment. The heat treatment system was as follows: the temperature was raised to 550° C. at a heating rate of 5° C. / min and kept for 2 hours to o...

Embodiment 2

[0043] (1) Preparation of precursor solution:

[0044] Weigh zinc nitrate and hexamethylenetetramine, dissolve in deionized water to prepare a uniform and stable precursor solution. Wherein the concentration of zinc nitrate is 0.01mol / L, and the concentration of hexamethylenetetramine is 0.005mol / L.

[0045] (2) Electric field-guided growth of ZnO whiskers:

[0046] Place the precursor solution obtained in step (1) in a glass beaker and place it on a magnetic stirring heating device with an electric field (temperature: 85°C; electric field strength: 20KV m -1 ), after reacting for a period of time (6h), the solid precipitate was separated by centrifugation, and washed several times with distilled water to neutrality, and the obtained powder was dried in a drying oven at 60°C.

[0047] (3) The dried product was subjected to heat treatment. The heat treatment system was as follows: the temperature was raised to 550° C. at a heating rate of 5° C. / min and kept for 2 hours to obt...

Embodiment 3

[0050] (1) Preparation of precursor solution:

[0051] Weigh zinc nitrate and hexamethylenetetramine, dissolve in deionized water to prepare a uniform and stable precursor solution. Wherein the concentration of zinc nitrate is 0.01mol / L, and the concentration of hexamethylenetetramine is 0.002mol / L.

[0052] (2) Electric field-guided growth of ZnO whiskers:

[0053] Place the precursor solution obtained in step (1) in a glass beaker, place it on a magnetic stirring heating device with an electric field (temperature: 95°C; electric field strength: 25KV·m-1), and react for a period of time (10h). The solid precipitate was separated by centrifugation, washed several times with distilled water until neutral, and the obtained powder was dried in a drying oven at 60°C.

[0054] (3) The dried product was subjected to heat treatment. The heat treatment system was as follows: the temperature was raised to 550° C. at a heating rate of 5° C. / min and kept for 2 hours to obtain the final...

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Abstract

The present invention relates to a method for electric field assisted preparation of one-dimensional nanometer ZnO crystal whisker, wherein main raw materials comprise zinc nitrate and hexamethylenetetramine. The process mainly comprises the following three steps: 1, preparing a precursor solution, 2, carrying out electric field orientation ZnO crystal whisker growth, and 3, carrying out a crystal whisker heat treatment. The method is characterized in that a low price inorganic salt is adopted as a raw material, and an external electric field is applied based on a solution method to achieve high aspect ratio ZnO crystal whisker preparation. With the method, a hexagonal wurtzite ZnO crystal whisker with a high aspect ratio of up to 100 can be prepared, and an aspect ratio of the crystal whisker can be controlled in a certain range through change of the external electric field. According to the present invention, the method has characteristics of simple preparation process and low production cost, and the prepared ZnO crystal has characteristics of controllable diameter and controllable length.

Description

technical field [0001] The invention relates to the field of low-dimensional materials, in particular to a method for preparing one-dimensional nanometer ZnO whiskers by electric field assistance. Background technique [0002] In recent decades, many scholars at home and abroad have devoted themselves to the research work on the preparation technology of one-dimensional ZnO whisker materials. One-dimensional ZnO whisker material is a wide bandgap, direct bandgap 3.37eV, II-VI group semiconductor material, the bandgap width at room temperature is 3.37eV, the exciton binding energy is as high as 60meV, and there is a significant room temperature exciton effect, It has a wide range of uses in solar cells, photosensitive materials, ion batteries, catalysis, etc. At present, many literatures have reported the preparation methods of one-dimensional ZnO. in: [0003] Zhang Linli et al. successfully prepared one-dimensional ZnO rod-like structures using zinc acetate as a raw mat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C30B30/02C30B28/04C30B29/62C30B29/16
Inventor 王浩黄志新程磊梅森
Owner WUHAN UNIV OF TECH
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