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Co-doped ZnO gas-sensitive nano-material preparation method, product of nano-material and application of nano-material

A nano-material and gas-sensing technology, which is applied in the field of metal oxide nano-material preparation, can solve the problems of high working temperature and poor selectivity, and achieve the effect of simple preparation method, strong controllability, and improved selectivity and response speed

Inactive Publication Date: 2018-05-15
SHANGHAI NAT ENG RES CENT FORNANOTECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the single ZnO gas sensor still has disadvantages such as high working temperature and poor selectivity.

Method used

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  • Co-doped ZnO gas-sensitive nano-material preparation method, product of nano-material and application of nano-material
  • Co-doped ZnO gas-sensitive nano-material preparation method, product of nano-material and application of nano-material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] (1) Take 20g of ammonium bicarbonate and place it in the three-necked flask 1, and add 50mL of water;

[0026] (2) Weigh 0.4g of zinc acetate and 0.005g of cobalt chloride hexahydrate and place it in a three-necked flask 2, and add 50mL of water;

[0027] (3) After heating the three-necked flask from 2 to 80°C, heat the three-necked flask from 1 to 80°C, and pass the generated gas into the solution of the three-necked flask 2, and react for 30 minutes; filter the precipitate, wash and dry, and wait until the drying is completed , and then placed in a muffle furnace, fired at 500° C. for 180 min to obtain Co-doped ZnO gas-sensitive nanomaterials.

[0028] figure 1 It is a diagram of the reaction device for preparing Co-doped ZnO gas-sensitive nanomaterials in the present invention. The ammonium bicarbonate in the three-necked flask 1 is thermally decomposed to produce ammonia and carbon dioxide gas, and the generated gas is passed into the three-necked flask 2 through t...

Embodiment 2

[0030] (1) Take 25g of ammonium bicarbonate and place it in a three-necked flask 1, and add 50mL of water;

[0031] (2) Weigh 0.5g of zinc acetate and 0.006g of cobalt chloride hexahydrate and place it in a three-necked flask 2, and add 50mL of water;

[0032] (3) After heating the three-necked flask from 2 to 90°C, heat the three-necked flask from 1 to 80°C, and pass the generated gas into the solution of the three-necked flask 2, and react for 40 minutes; filter the precipitate, wash and dry, and wait until the drying is completed , and then placed in a muffle furnace, fired at 450° C. for 150 min to obtain Co-doped ZnO gas-sensitive nanomaterials.

Embodiment 3

[0034] (1) Take 23g of ammonium bicarbonate and place it in a three-necked flask 1, and add 50mL of water;

[0035] (2) Weigh 0.6g of zinc acetate and 0.006g of cobalt chloride hexahydrate and place it in a three-necked flask 2, and add 50mL of water;

[0036] (3) After heating the three-necked flask from 2 to 70°C, heat the three-necked flask from 1 to 60°C, and pass the generated gas into the solution of the three-necked flask 2, and react for 40 minutes; filter the precipitate, wash and dry, and wait until the drying is completed , and then placed in a muffle furnace, fired at 550° C. for 120 min to obtain Co-doped ZnO gas-sensitive nanomaterials.

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Abstract

The invention discloses a Co-doped ZnO gas-sensitive nano-material preparation method, a product of the nano-material and an application of the nano-material. Ammonium bicarbonate is placed into a three-mouth flask 1, and 50mL of water is added into the three-mouth flask 1. Zinc acetate and cobalt chloride hexahydrate are placed into a three-mouth flask 2, and 50mL of water is added into the three-mouth flask 2. The zinc acetate can be replaced by zinc chloride or zinc nitrate with equal molar weight. After the three-mouth flask 2 is heated to reach a certain temperature, the three-mouth flask1 is heated, generated gas is led into solution in the three-mouth flask 2, and reaction is performed to generate precipitates. The precipitates are filtered, washed, dried and then placed into a muffle furnace for roasting to obtain the Co-doped ZnO gas-sensitive nano-material. The preparation method has the advantages that the preparation method is simple, reaction temperature is low, Co dopingamount can be controlled, and the Co-doped ZnO gas-sensitive nano-material prepared by the preparation method is high in purity, uniform in size and short in gas-sensitive response and recovery time.

Description

technical field [0001] The invention belongs to the field of metal oxide nano-material preparation, and in particular relates to a preparation method of Co-doped ZnO gas-sensitive nano-material and its product and application. Background technique [0002] Zinc oxide (ZnO) is a multifunctional n-type inorganic semiconductor material with wide bandgap (3.37 eV) and high exciton binding energy (60 meV), which usually has a hexagonal wurtzite crystal structure, which is prone to defects and impurities. Doped. Since the resistivity of ZnO varies with the type and concentration of adsorbed gas on the surface, this property can be used to detect the composition and concentration of the gas. For oxidizing gases, reducing gases (such as H 2 S, H 2 etc.), toxic gases (such as NH 3 ) and so on have a certain sensitivity. However, the single ZnO gas sensor still has disadvantages such as high working temperature and poor selectivity. [0003] Doped metal elements can be used as ca...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/80B01J35/02B01J37/03B01J37/08G01N27/12B01J35/00
CPCG01N27/127B01J23/80B01J37/031B01J37/088B01J35/40
Inventor 何丹农孙健武葛美英尹桂林张芳金彩虹
Owner SHANGHAI NAT ENG RES CENT FORNANOTECH
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