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Preparation method of Au-LaFeO3 nanocomposite material

A nanocomposite material and hydration technology, which is applied in the field of preparation of Au-LaFeO3 nanocomposite materials, can solve the problems of poor material selectivity, restricted detection performance, and low sensitivity

Inactive Publication Date: 2018-12-18
UNIV OF JINAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the current requirements for gas detection technology are getting higher and higher, and the range of gas detection is also expanding. 3 The study of gas-sensitive materials also poses new challenges
In the actual work of testing the gas sensor, the simple LaFeO 3 Poor material selectivity and low sensitivity restrict its detection performance

Method used

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  • Preparation method of Au-LaFeO3 nanocomposite material
  • Preparation method of Au-LaFeO3 nanocomposite material
  • Preparation method of Au-LaFeO3 nanocomposite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] (1) Weigh a certain amount of hydrated lanthanum nitrate, hydrated ferric nitrate and citric acid and dissolve them in 40 mL of deionized water. The concentration of acid is 0.1 mol / L, and the mol ratio of controlling hydrated lanthanum nitrate and hydrated ferric nitrate is 1:1, and the mol ratio of controlling hydrated lanthanum nitrate and citric acid is 1:5;

[0018] (2) Transfer the mixed solution obtained in step (1) to a magnetic heating stirrer and heat it in a water bath at 40 °C for 30 min and stir until the drug is completely dissolved. After the above solution is naturally cooled to room temperature, transfer it to a polystyrene liner. In the hydrothermal reaction kettle of vinyl fluoride, the hydrothermal reaction was carried out at 170 °C for 9 h, and then the product after the hydrothermal reaction was separated from the solid and liquid by a centrifuge, and the obtained solid product was subjected to multi-treatment with deionized water and ethanol. Afte...

Embodiment 2

[0022] (1) Weigh a certain amount of hydrated lanthanum nitrate, hydrated ferric nitrate and citric acid and dissolve them in 40 mL of deionized water. The concentration of acid is 0.15 mol / L, and the mol ratio of controlling hydrated lanthanum nitrate and hydrated ferric nitrate is 1:1, and the mol ratio of controlling hydrated lanthanum nitrate and citric acid is 1:5;

[0023] (2) Transfer the mixed solution obtained in step (1) to a magnetic heating stirrer and heat it in a water bath at 50 °C for 30 min and stir until the drug is completely dissolved. After the above solution is naturally cooled to room temperature, transfer it to a polystyrene liner. In the hydrothermal reaction kettle of vinyl fluoride, the hydrothermal reaction was carried out at 180 °C for 9 h, and then the product after the hydrothermal reaction was separated from the solid and liquid by a centrifuge, and the obtained solid product was subjected to multi-treatment with deionized water and ethanol. Aft...

Embodiment 3

[0027] (1) Weigh a certain amount of hydrated lanthanum nitrate, hydrated ferric nitrate and citric acid and dissolve them in 40 mL of deionized water. The concentration of acid is 0.3 mol / L, and the mol ratio of controlling hydrated lanthanum nitrate and hydrated ferric nitrate is 1:1, and the mol ratio of controlling hydrated lanthanum nitrate and citric acid is 1:6;

[0028] (2) Transfer the mixed solution obtained in step (1) to a magnetic heating stirrer and heat it in a water bath at 50 °C for 30 min and stir until the drug is completely dissolved. After the above solution is naturally cooled to room temperature, transfer it to a polystyrene liner. In the hydrothermal reaction kettle of vinyl fluoride, the hydrothermal reaction was carried out at 180 °C for 9 h, and then the product after the hydrothermal reaction was separated from the solid and liquid by a centrifuge, and the obtained solid product was subjected to multi-treatment with deionized water and ethanol. Afte...

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Abstract

The invention provides a preparation method of an Au-LaFeO3 nanocomposite material. The preparation method specifically comprises the following steps: carrying out a hydrothermal reaction on raw materials including lanthanum nitrate hydrate, ferric nitrate hydrate and citric acid, and calcining to obtain lanthanum ferrite nano-microspheres; and using L-lysine, HAuCl4 and trisodium citrate as raw materials to compound granular gold particles on the surface of the lanthanum ferrite nano-microspheres. The composite material of the invention shows high sensitivity and fast response and recovery toacetone, can be used in the field of acetone gas sensors to obtain novel gas sensitive materials with high sensitivity.

Description

technical field [0001] The present invention relates to a kind of Au-LaFeO 3 The invention relates to a method for preparing nanocomposite materials, which belongs to the technical field of preparation technology of advanced nanometer functional materials. Background technique [0002] With the intensification of environmental pollution, the qualitative and quantitative detection of toxic and harmful gases is becoming more and more important. Nowadays, the analysis of these gases usually uses some time-consuming and expensive test instruments, such as spectral analysis and chromatographic analysis. Since the semiconductor metal oxide gas sensor has the advantages of high sensitivity, high selectivity, fast response and low price, it will be an ideal and promising substitute for detecting toxic and harmful gases in the future. Perovskite composite oxide lanthanum ferrite (LaFeO 3 ) occupies an important position in many gas-sensitive materials. The reason is that the lant...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G49/00B22F9/24
CPCB22F9/24C01G49/0054C01G49/0081C01P2002/72C01P2002/85C01P2004/04
Inventor 宋鹏郝佩王琦位祺杨中喜
Owner UNIV OF JINAN
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