Preparation method of flower type indium oxide gas-sensitive material with hierarchical structure

A hierarchical structure, indium gas-sensing technology, applied in the field of sensing materials

Inactive Publication Date: 2014-12-24
UNIV OF JINAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004]However, the above synthetic techniques are complex, high cost, relatively weak gas-sensing performance and other disadvantages

Method used

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  • Preparation method of flower type indium oxide gas-sensitive material with hierarchical structure
  • Preparation method of flower type indium oxide gas-sensitive material with hierarchical structure
  • Preparation method of flower type indium oxide gas-sensitive material with hierarchical structure

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0024] (1) Mixing and stirring: Prepare a mixed solution of dimethylformamide and deionized water with a volume ratio of 1:1, the total volume is 30 ml, and the molar ratio is 2: Add 1% sodium citrate and indium chloride into the mixed solution respectively, stir well, the molar ratio of urea is 5:1, add urea as precipitant, stir for 30 minutes, mix well.

[0025] (2) Solvothermal reaction and solid-liquid separation: transfer the mixed solution obtained in step (1) into a 50-milliliter inner polytetrafluoroethylene reaction kettle, and place the reaction kettle in a precision constant temperature electric drying oven for 170 After reacting at ℃ for 10 hours, it was cooled to room temperature. The resulting solution was poured off the supernatant, and the precipitate was transferred to a beaker, washed with distilled water and absolute ethanol several times, and centrifuged.

[0026] (3) Drying and calcination: the solid product obtained in step (2) was placed in a drying ove...

example 2

[0029] (1) Mixing and stirring: Prepare a mixed solution of dimethylformamide and deionized water with a volume ratio of 0.7:1, the total volume is 30 ml, and the molar ratio is 3: Add 1% sodium citrate and indium chloride into the mixed solution respectively, stir well, the molar ratio of urea is 5:1, add urea as precipitant, stir for 30 minutes, mix well.

[0030] (2) Solvothermal reaction and solid-liquid separation: transfer the mixed solution obtained in step (1) into a 50-milliliter inner Teflon reaction kettle, and place the reaction kettle in a precision constant temperature electric drying oven for 180 After reacting at ℃ for 13 hours, it was cooled to room temperature. The resulting solution was poured off the supernatant, and the precipitate was transferred to a beaker, washed with distilled water and absolute ethanol several times, and centrifuged.

[0031] (3) Drying and calcination: the solid product obtained in step (2) was placed in a drying oven, dried at 60 ...

example 3

[0033] (1) Mixing and stirring: prepare a mixed solution of dimethylformamide and deionized water with a volume ratio of 0.5:1, the total volume is 30 ml, and the molar ratio is 2: Add 1% sodium citrate and indium chloride into the mixed solution respectively, stir well, the molar ratio of urea is 5:1, add urea as precipitant, stir for 30 minutes, mix well.

[0034] (2) Solvothermal reaction and solid-liquid separation: transfer the mixed solution obtained in step (1) into a 50-milliliter inner polytetrafluoroethylene reaction kettle, and place the reaction kettle in a precision constant temperature electric drying oven for 160 After reacting at ℃ for 15 hours, it was cooled to room temperature. The resulting solution was poured off the supernatant, and the precipitate was transferred to a beaker, washed with distilled water and absolute ethanol several times, and centrifuged.

[0035] (3) Drying and calcination: the solid product obtained in step (2) was placed in a drying o...

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Abstract

The invention provides a method of preparing a flower type indium oxide gas-sensitive material with a hierarchical structure by adopting a solvothermal method. The preparation method concretely comprises the following steps: respectively adding a certain amount of indium oxide and a certain amount of sodium citrate into a dimethylformamide and deionized water mixed solution of certain mole ratio, fully mixing, then adding a certain amount of urea as a precipitator, evenly dispersing, sealing the mixed solution into an autoclave, performing hydrothermal reaction for certain time at specific temperature, centrifugally separating, washing and drying, placing the dried product in the air in a muffle furnace for calcinating, and thus obtaining the flower type indium oxide gas-sensitive material with the hierarchical structure. The method is simple in production technology, high in yield, low in cost and pollution-free, and mass production can be conducted. The prepared flower type indium oxide gas-sensitive material with the hierarchical structure is regular in shape, obvious in hierarchical structure of flower petals, smooth in surfaces of flower petals, large in specific surface, and mainly applied in the field of gas sensors.

Description

technical field [0001] The invention belongs to the technical field of sensing materials, and in particular relates to a preparation method of a flower-shaped indium oxide gas-sensitive material with a hierarchical structure. Background technique [0002] In 2 o 3 It is an n-type wide bandgap semiconductor material with low resistivity and high catalytic activity. In 2 o 3 Gas sensors based on nanomaterials have the characteristics of low power consumption and high sensitivity, and have been widely used in solar cells, flat panel displays, optoelectronic devices, especially gas sensors. [0003] In recent years, gas-sensing materials with different morphologies and porous structures have attracted extensive attention from researchers because of their higher specific surface area, which is more conducive to gas adsorption. Such as Lou Xiangdong et al. (Li Pei, Wang Xiaodong, Qin Nan, Wang Xuefeng. Surfactant-hydrothermal method to prepare nano-In 2 o 3 Gas-sensitive mat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G15/00
Inventor 韩丹宋鹏王琦杨中喜张慧慧
Owner UNIV OF JINAN
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