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Preparation methods of lanthanum-doped cobalt nickel ferrite gas-sensitive powder and gas sensor

A technology of cobalt-nickel ferrite and gas sensor, applied in the direction of material resistance, can solve problems such as low sensitivity, and achieve the effects of high sensitivity, good selectivity and simple preparation method

Inactive Publication Date: 2012-06-20
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Studies have shown that cobalt ferrite and cobalt nickel ferrite have become a promising gas sensing material due to their high selectivity and good chemical stability, but their low sensitivity still limits their application. key

Method used

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  • Preparation methods of lanthanum-doped cobalt nickel ferrite gas-sensitive powder and gas sensor
  • Preparation methods of lanthanum-doped cobalt nickel ferrite gas-sensitive powder and gas sensor
  • Preparation methods of lanthanum-doped cobalt nickel ferrite gas-sensitive powder and gas sensor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Weigh 1.8181g Fe(NO 3 ) 3 9H 2 O, 0.5821g Co(NO 3 ) 2 ·6H 2 O, 0.1454g Ni(NO 3 ) 2 ·6H 2 O, 0.2165g La(NO 3 ) 3 ·6H 2 O is added to a three-necked flask, and then 50ml of analytically pure ethylene glycol solution is added, and after fully stirring, Fe in the solution 3+ The molar concentration is 0.09mol / L; then add 3.6g of anhydrous sodium acetate and mechanically stir for 25min at a speed of 500rpm. 12h. After the reaction was completed, the product was washed with distilled water and absolute ethanol, and centrifuged three times, and then the product was dried at 80°C for 12 hours to obtain Co 0.8 Ni 0.2 La 0.2 Fe 1.8 o 4 Nano powder.

[0034] figure 2 It is the X-ray diffraction pattern of the powder synthesized in this embodiment, and the diffraction peaks in the figure show that the nanopowder is Co 0.8 Ni 0.2 La 0.2 Fe 1.8 o 4 , the Scherrer formula calculation shows that the grain size of the synthetic powder is about 5.4nm; image 3 It...

Embodiment 2

[0038] Weigh 1.9191g Fe(NO 3 ) 3 9H 2 O, 0.5821g Co(NO 3 ) 2 ·6H 2 O, 0.1454g Ni(NO 3 ) 2 ·6H 2 O, 0.1083g La(NO 3 ) 3 ·6H 2 0, add a three-necked flask, then add 55ml of analytically pure ethylene glycol solution, after fully stirring, Fe in the solution 3+ The molar concentration is 0.085mol / L; then add 4.42g of anhydrous sodium acetate and mechanically stir for 40min at a speed of 300 rpm. 8h; after the reaction was completed, the product was washed with distilled water and absolute ethanol, and centrifuged for 4 times, and then the product was dried at 60°C for 18h to obtain Co 0.8 Ni 0.2 La 0.1 Fe 1.9 o 4 Nano powder.

[0039] X-ray diffraction analysis shows that the nanopowder is Co 0.8 Ni 0.2 La 0.1 Fe 1.9 o 4 ; It can be seen from the scanning electron microscope photo of the synthetic powder that the Co in the powder 0.8 Ni 0.2 La 0.1 Fe 1.9 o 4 The particle size is about 100nm.

[0040] Weigh 0.08g of Co 0.8 Ni 0.2 La 0.1 Fe 1.9 o 4 T...

Embodiment 3

[0043] Weigh 1.5151g Fe(NO 3 ) 3 9H 2 O, 0.1455g Co(NO 3 ) 2 ·6H 2 O, 0.5816g Ni(NO 3 ) 2 ·6H 2 O, 0.5413g La(NO 3 ) 3 ·6H 2 0, add a three-necked flask, then add 50ml of analytically pure ethylene glycol solution, after fully stirring, Fe in the solution 3+ The molar concentration is 0.094mol / L; then add 4.62g of anhydrous sodium acetate, and mechanically stir for 35min at a speed of 400 rpm. 14h. After the reaction was completed, the product was washed with distilled water and absolute ethanol, and centrifuged for 5 times, and then the product was dried at 50°C for 22h to obtain Co 0.2 Ni 0.8 La 0.5 Fe 1.5 o 4 Nano powder.

[0044] X-ray diffraction analysis shows that the nanopowder is Co 0.8 Ni 0.2 La 0.1 Fe 1.9 o 4 ; It can be seen from the scanning electron microscope photo of the synthetic powder that the Co in the powder 0.2 Ni 0.8 La 0.5 Fe 1.5 o 4 The particle size is about 100nm.

[0045] Weigh 0.09g of Co 0.2 Ni 0.8 La 0.5 Fe 1.5 o ...

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Abstract

The invention relates to preparation methods of lanthanum-doped cobalt nickel ferrite gas-sensitive powder and a gas sensor. The preparation method of the gas-sensitive powder comprises the following steps: (1) soluble cobalt salt, nickel salt, lanthanum salt and ferric salt are mixed and dispersed into ethylene glycol, and sodium acetate anhydrous is added and stirred to form reaction solution; and (2) the reaction solution is heated and reacted, then is cooled to room temperature after the reaction, and washed, centrifugated and dried. The preparation method of the gas sensor comprises the following steps: the gas-sensitive powder and terpilenol solution of ethyl cellulose are mixed and ground to form gas-sensitive slurry; and then the gas-sensitive slurry is uniformly coated to an Al2O3 ceramic tube with an Au electrode, conducted to gas drying and calcination, and installed on a testing base, and then the gas sensor is obtained after ageing. The preparation methods are simple, the requirement on the production equipment is low, the industrial production is easy, and the prepared gas-sensitive powder has good selectivity, good chemical stability and good sensitivity.

Description

technical field [0001] The invention belongs to the field of preparation of gas-sensitive materials and gas-sensitive elements, in particular to a lanthanum-doped cobalt-nickel ferrite (Co 1-x Ni x La y Fe 2-y o 4 ) Gas-sensitive powder and a method for preparing a gas-sensitive element. Background technique [0002] Volatile organic compounds are a class of air pollutants that have an important impact on human production and life. Many building materials, daily cleaners, cosmetics, and pesticides used in agriculture will produce volatile organic compounds. Common toxic and harmful Volatile organic compounds include ammonia, benzene, toluene, and methanol. As people pay more and more attention to environmental protection, higher requirements are put forward for the monitoring of toxic and harmful gases in the fields of air pollution monitoring, food safety and living environment monitoring, which also makes the research and development of gas sensors more and more impor...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/04
Inventor 李耀刚唐亚王宏志张青红
Owner DONGHUA UNIV
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