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Quantum size zinc oxide and preparation method and application thereof

A technology of zinc oxide and size, which is applied in the direction of zinc oxide/zinc hydroxide, measuring devices, instruments, etc., can solve the problems that quantum-sized zinc oxide crystals cannot be prepared, and the preparation method of quantum-sized zinc oxide is not mature enough to achieve structural stability , short reaction time and controllable reaction conditions

Inactive Publication Date: 2011-08-24
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] It can be seen from the above literature that the preparation method of quantum-sized zinc oxide is not mature enough to prepare ideal quantum-sized zinc oxide crystals.

Method used

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  • Quantum size zinc oxide and preparation method and application thereof
  • Quantum size zinc oxide and preparation method and application thereof
  • Quantum size zinc oxide and preparation method and application thereof

Examples

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Effect test

Embodiment 1

[0023] Accurately weigh 0.2195g Zn(Ac) 2 2H 2 O and 0.06g NaOH were respectively dissolved in 20ml of absolute ethanol, under magnetic stirring at a rotational speed of 200rpm, slowly added the prepared NaOH-ethanol solution into the above Zn salt solution, so that the pH value of the mixed solution was about 12 , continue stirring for 1h. Accurately weigh 0.09 g of oleic acid, add it into the above reaction solution, and stir magnetically for 1 h. The obtained white jelly liquid was centrifuged at a speed of 3000r / s, and washed 2 to 3 times with absolute ethanol, and the white jelly obtained by centrifugation was dried at 50°C for 5 hours, and the temperature was raised to 200°C at a heating rate of 10°C / min. ℃, kept for 60 minutes, to obtain zinc oxide powder with quantum size.

[0024] According to the above experiment, except that oleic acid is not added, the prepared zinc oxide is very easy to agglomerate, and the particle size increases significantly.

[0025] The zi...

Embodiment 2

[0028] Accurately weigh 0.1785g Zn(NO 3 ) 2 ·6H 2 O and 0.12g NaOH were respectively dissolved in 20ml of absolute ethanol, under magnetic stirring at a rotational speed of 200rpm, slowly added the prepared NaOH-ethanol solution into the above Zn salt solution, so that the pH value of the mixed solution was about 12 , continue stirring for 1h. Accurately weigh 0.09 g of oleic acid and add it to the above reaction solution, and magnetically stir for 1 h. The obtained white jelly liquid was centrifuged at a speed of 3000r / s, and washed 2 to 3 times with absolute ethanol, and the white jelly obtained by centrifugation was dried at 50°C for 5 hours, and the temperature was raised to 400°C at a heating rate of 10°C / min. ℃ and kept for 60 min, a sample with a diameter of about 7 nm was obtained. PL from quantum-sized ZnO ( figure 2 b) The fluorescence effect of baking at 400°C can be seen. From the XRD of quantum size zinc oxide ( image 3 b) The degree of crystallization of...

Embodiment 3

[0030] Confirm that 0.191g ZnCl and 0.09g NaOH are dissolved in 20ml absolute ethanol respectively, and under magnetic stirring at 200rpm, the NaOH-ethanol solution prepared is slowly added dropwise to the above-mentioned Zn salt solution to make the mixed solution The pH value is about 12, continue to stir for 1h. Accurately weigh 0.09 g of oleic acid and add it to the above reaction solution, and magnetically stir for 1 h. The obtained white jelly liquid was centrifuged at a speed of 3000r / s, and washed 2 to 3 times with absolute ethanol, and the white jelly obtained by centrifugation was dried at 50°C for 5 hours, and the temperature was raised to 600°C at a heating rate of 10°C / min. ℃, kept for 60min, and a sample with a diameter of about 25nm was obtained. PL from quantum-sized ZnO ( figure 2 c) The fluorescence effect of baking at 600°C can be seen. From the XRD of quantum size zinc oxide ( image 3 c) The degree of crystallization of quantum-sized zinc oxide at 600...

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Abstract

The invention provides quantum size zinc oxide, a preparation method thereof and application of the quantum size zinc oxide used as a gas-sensitive material. The method comprises the following steps of: performing an ethanol heat reaction of solution of zinc salt and solution of sodium hydroxide, and successfully preparing a zinc oxide quantum dot material with high crystallinity by adding a surface modification agent and controlling reaction conditions. The dimensions of quantum dots of the zinc oxide are 1 to 10nm. Compared with the conventional method for preparing the quantum dots of the zinc oxide, the method has the advantages of low cost, low energy consumption, high product crystallinity and the like and is easy to operate. A prepared nanometer zinc oxide material has excellent gas sensitivity to nitrogen dioxide gas, and is a good gas-sensitive material.

Description

Technical field: [0001] The invention relates to a quantum-sized oxide, its preparation method and its use as a gas-sensing material. Background technique [0002] Zinc oxide is an N-type semiconducting metal oxide, which can show special uses in many aspects such as gas sensing, lasers, high-density memory, piezoelectric devices, catalysis and bioluminescence labeling. The preparation process of metal oxides currently used in gas sensing is relatively complicated, which is not conducive to industrial production. This largely limits the application of these metal oxides in gas sensing. Zinc oxide is a relatively high-performance, low-cost gas-sensing material. At present, there are mainly physical and chemical methods for the preparation of quantum-sized zinc oxide, and the chemical method is currently the most convenient and commonly used method. However, the current chemical preparation methods have certain limitations, and the main problem is the aggregation growth and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G9/02G01N27/00
Inventor 白守礼徐小艳胡景伟罗瑞贤李殿卿
Owner BEIJING UNIV OF CHEM TECH
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