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Preparation method of rare earth doped zinc oxide nanowire for gas sensor

A zinc oxide nanowire and gas sensor technology, applied in the field of preparation of rare earth doped zinc oxide nanowires, can solve the problems of high cost, toxicity and price, and achieve the effects of low cost, easy regulation and uniform size distribution

Inactive Publication Date: 2013-10-23
SHANGHAI NAT ENG RES CENT FORNANOTECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Most noble metal dopants are catalytic metals such as Au, Ag, Pd, Pt, etc., but they are often toxic and expensive; rare earth elements have excellent magnetic and optical properties due to their special atomic shell structure Therefore, adjusting the physical properties of ZnO semiconductors doped with rare earth elements can improve the electrical properties of ZnO nanomaterials, which is expected to improve the sensitivity of gas sensors. It can also reduce the probability of electron-hole recombination and improve its photoelectricity when used in solar cell photoanodes. conversion properties
However, how to achieve effective doping in nanocrystals and how to overcome the self-purification effect of semiconductors and the destruction of surface dangling bonds and defect states caused by doping have always been a challenge.

Method used

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  • Preparation method of rare earth doped zinc oxide nanowire for gas sensor
  • Preparation method of rare earth doped zinc oxide nanowire for gas sensor
  • Preparation method of rare earth doped zinc oxide nanowire for gas sensor

Examples

Experimental program
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Effect test

Embodiment 1

[0024] Weigh 4 g of sodium hydroxide and place it in a three-necked flask, add 50 ml of deionized water, and add 2 ml of triethanolamine to the solution; weigh 15 g of zinc nitrate hexahydrate, add 50 ml of deionized water to make zinc nitrate Aqueous solution, weigh 1 g of dysprosium nitrate pentahydrate, and place it in the zinc nitrate solution; heat the three-necked flask to 80 °C, and after about 20 minutes, inject the zinc-rare earth precursor composite solution, and continue to maintain the temperature for about 30 minutes after injection. The sample was centrifuged to obtain a white powder. Dry it in a drying oven at 50° C. to obtain rare earth-doped zinc oxide nanowires.

[0025] figure 1 , figure 2 The SEM images and EDS energy spectrum images of the dysprosium-doped zinc oxide nanowires prepared in this example are given respectively. It can be seen from the SEM image that the size distribution of dysprosium-doped zinc oxide nanowires is uniform and the diameter...

Embodiment 2

[0027] Weigh 4 g of sodium hydroxide and place it in a three-necked flask, add 50 ml of deionized water, and add 2 ml of diethanolamine to the solution; weigh 14.3 g of zinc sulfate heptahydrate, add 50 ml of deionized water to make zinc sulfate aqueous solution, weigh 1 g of dysprosium nitrate pentahydrate, and place it in zinc sulfate solution; heat the three-necked bottle to 80 o C. After about 20 minutes, inject the zinc-rare earth precursor composite solution, continue to maintain the temperature for about 30 minutes after injection, and centrifuge the sample to obtain a white powder. at 50 o Dry in a drying oven at C to obtain rare earth-doped zinc oxide nanowires.

Embodiment 3

[0029] Weigh 2.8 g of potassium hydroxide and place it in a three-necked flask, add 50 ml of deionized water, and add 3 ml of diethanolamine to the solution; weigh 14.3 g of zinc sulfate heptahydrate, add 50 ml of deionized water to make zinc sulfate As an aqueous solution, weigh 1 g of dysprosium nitrate pentahydrate and place it in a zinc sulfate solution; heat the three-necked flask to 80°C, and after about 20 minutes, inject the zinc-rare earth precursor composite solution, and continue to maintain the temperature for about 30 minutes after injection. The sample was centrifuged to obtain a white powder. Dry it in a drying oven at 50° C. to obtain rare earth-doped zinc oxide nanowires.

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Abstract

The invention discloses a preparation method of a rare earth doped zinc oxide nanowire for a gas sensor. The zinc oxide nanowire is synthesized under a strong alkali condition by using a chemical solution method; the gas sensor is of a heater-type device structure; an aluminum oxide ceramic tube is used as a carrier and internally provided with a heating wire; a gas sensitive material of the rare earth doped zinc oxide nanowire is coated outside the ceramic tube. The gas sensor can be used for detecting ethanol within different working temperature ranges and is high in response ratio and short in response time. The preparation method of the rare earth doped zinc oxide nanowire is simple; the rare earth doping variety and concentration are easy to control; the obtained rare earth doped zinc oxide nanowire has the advantages such as uniformity in diameter distribution, good stability and the like; the rare earth doped zinc oxide nanowire prepared by the invention can be used for the gas sensor, a solar cell photoanode and the like.

Description

technical field [0001] The invention relates to a metal oxide gas-sensing material, in particular to a preparation method of a rare-earth-doped zinc oxide nanowire and its gas-sensing properties. Background technique [0002] Zinc oxide nanomaterials have high specific surface area and good photoelectric and photocatalytic properties, and have very broad application prospects in the fields of gas sensors, dye-sensitized solar cells, photocatalysts, chemical photosensitive and biomedical materials. ZnO nanomaterials have a large specific surface area, can load more catalyst active components, and have strong ion exchange performance, which is conducive to the reaction of reactants at the active site during the catalytic process, and is suitable for ethanol, acetone, formaldehyde and other gases. The detection aspect shows great application prospects, so ZnO nanostructure materials are widely used as sensitive materials for gas sensors. [0003] However, its working temperatu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/00B82Y30/00
Inventor 葛美英尹桂林姜来新汪元元何丹农
Owner SHANGHAI NAT ENG RES CENT FORNANOTECH
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