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Gas-sensitive nano material and preparing method thereof

A nano-material and gas-sensing technology, applied in the field of sensing materials, can solve the problems of low optimal working temperature, high optimal working temperature, and weak gas-sensing selectivity, achieving low operating temperature, strong selectivity, and high preparation The effect of simple process

Inactive Publication Date: 2004-09-15
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to solve the disadvantages of low sensitivity, weak gas sensitivity selectivity and high optimum working temperature in the prior art, the present invention designs a The gas sensitive material and the preparation method are given

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] Get x=0.32, according to the composition molecular formula La 0.68 Pb 0.32 FeO 3 Weigh out 2.52 grams of lanthanum nitrate, the content of lanthanum oxide is 44%, 1.06 grams of lead nitrate, 2.41 grams of ferric nitrate, calculated as anhydrous salt, dissolve in deionized water, add 2.1 grams of citric acid, put the solution Heat in a water bath at 40°C, stir and add 0.6 g of polyethylene glycol (molecular weight: 6000), and continue stirring until it reaches a gel state. Put the obtained gel in an oven to dry, the temperature is controlled at 60°C, and then burn at 200°C to obtain the original powder, grind the original powder, and anneal at 600°C for 0.5 hours to obtain the gas-sensitive nanomaterial La 0.68 Pb 0.32 FeO 3 . In the 100ppm ethanol atmosphere, the sensitivity can reach 51; in the 1000ppm ethanol atmosphere, the sensitivity can reach 522.

Embodiment 2

[0015] Get x=0.32, according to the composition molecular formula La 0.68 Pb 0.32 FeO 3 Weigh out 2.52 grams of lanthanum nitrate, the content of lanthanum oxide is 44%, 1.06 grams of lead nitrate, 2.41 grams of ferric nitrate, calculated as anhydrous salt, dissolve in deionized water, add 3.2 grams of citric acid, put the solution Heat in a water bath at 50° C., stir and add 0.8 g of polyethylene glycol (molecular weight: 8000), and continue stirring until gel state. Put the obtained gel in an oven to dry, the temperature is controlled at 60°C, and then burn at 200°C to obtain the original powder, grind the original powder, and anneal at 800°C for 2.5 hours to obtain the gas-sensitive nanomaterial La 0.68 Pb 0.32 FeO 3 . In 100ppm ethanol atmosphere, the sensitivity can reach 101.

Embodiment 3

[0017] Get x=0.33, according to the composition molecular formula La 0.67 Pb 0.33 FeO 3 Weigh out 2.48 grams of lanthanum nitrate, the content of lanthanum oxide is 44%, 1.09 grams of lead nitrate, 2.41 grams of iron nitrate, calculated as anhydrous salt, dissolve in deionized water, add 4.2 grams of citric acid, put the solution Heat in a water bath at 70° C., stir and add 1 gram of polyethylene glycol (molecular weight: 10,000), and continue stirring until it reaches a gel state. Put the obtained gel in an oven to dry, the temperature is controlled at 70°C, and then burn at 300°C to obtain the original powder, grind the original powder, and anneal at 800°C for 2 hours to obtain the gas-sensitive nanomaterial La 0.67 Pb 0.33 FeO 3 . In 1000ppm ethanol atmosphere, the sensitivity can reach 100.

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Abstract

The invention relates to a gas sensitive nano material and its preparing method. It is composed of La, Pb, Fe and O, where its molecular formula is La1-xPbxFeO3, where x is 0.32-0.5. It can be made by the sol-gel method. It has advantages of high sensitivity, strong selectivity, low working temperature, simple making technique, etc.

Description

(1) Technical field [0001] The invention relates to a gas-sensitive nanometer material and a preparation method thereof, belonging to the technical field of sensing materials. (2) Technical background [0002] Gas-sensitive materials are important functional materials, which can detect the existence and concentration of special gases, and have broad application prospects. The gas sensitive materials used earlier mainly include ZnO, SnO 2 They play an important role in the detection and control of toxic and harmful gases. However, ZnO, SnO 2 There are still many deficiencies in the selectivity, sensitivity, stability and other aspects of metal oxides such as metal oxides, and the best working temperature of this kind of metal oxide gas-sensitive materials is generally higher than 200 ° C, the best working temperature is too high for the The stability of the material is disadvantageous. Perovskite Oxide ABO 3 (A site is the rare earth element La, Pr, etc., and B site is t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B13/14G01N27/04
Inventor 胡季帆张玲秦宏伟宋鹏
Owner SHANDONG UNIV