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Doped sensitive material for improving performance of hydrogen sensor, and preparation method and application thereof

A sensitive material and doping technology, which is applied in the field of semiconductor metal oxide gas sensors, can solve the problems of low gas sensitivity and hinder development, and achieve the effects of no need for high-temperature calcination, good stability, and simple synthesis process

Active Publication Date: 2022-01-14
GUANGZHOU MARITIME INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

α-Fe 2 o 3 Environmental friendliness, low price and excellent thermodynamic stability are considered to be very promising gas-sensing materials, but the low gas-sensing performance seriously hinders its further development.

Method used

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  • Doped sensitive material for improving performance of hydrogen sensor, and preparation method and application thereof
  • Doped sensitive material for improving performance of hydrogen sensor, and preparation method and application thereof
  • Doped sensitive material for improving performance of hydrogen sensor, and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] Prepare Mn / α-Fe as follows 2 o 3 Sensitive materials and Mn / α-Fe 2 o 3 Hydrogen sensor:

[0046] Add 4.4g of ferric chloride, 0.6g of manganese chloride and 20mL of N,N-dimethylformamide into 160mL of deionized water in sequence, stir for 20min under a magnetic stirrer to obtain a uniformly mixed solution, and then mix them The formed mixed solution was put into a 250mL high-temperature stirred reactor with a polytetrafluoroethylene liner (rotating speed: 600rmp / min), and kept at 120°C for 18h. After the reaction kettle is cooled to room temperature, the obtained material is centrifuged (5000rpm / min), washed with a mixed solution of ethanol and deionized water (ethanol / deionized water=1:3), and then dried at 80°C , to get Mn / α-Fe 2 o 3 sensitive material. The resulting Mn / α-Fe 2 o 3 The sensitive material and the binder are mixed and stirred in the mortar to obtain a uniform mixed slurry and then evenly coated on the Al 2 o 3 plate surface until the mixed slu...

Embodiment 2

[0048] Prepare Ni / α-Fe as follows 2 o 3 Sensitive materials and Ni / α-Fe 2 o 3 Hydrogen sensor:

[0049] Add 4.4g of ferric chloride, 0.15g of nickel chloride and 20mL of N,N-dimethylformamide into 160mL of deionized water in sequence, stir for 20min under a magnetic stirrer to obtain a uniformly mixed solution, and then mix them The formed mixed solution was put into a 250mL high-temperature stirred reactor with a polytetrafluoroethylene liner (rotating speed: 600rmp / min), and kept at 120°C for 18h. After the reaction kettle is cooled to room temperature, the obtained material is centrifuged (5000rpm / min), washed with a mixed solution of ethanol and deionized water (ethanol / deionized water=1:3), and then dried at 80°C , to get Ni / α-Fe 2 o 3 sensitive material. The resulting Ni / α-Fe 2 o 3 The sensitive material and the binder are mixed and stirred in the mortar to obtain a uniform mixed slurry and then evenly coated on the Al 2 o 3 plate surface until the mixed slurr...

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Abstract

The invention discloses a preparation method of a doped sensitive material for improving the performance of a hydrogen sensor. The preparation method comprises the following steps: S1, adding a precipitant into deionized water, and fully and uniformly mixing to obtain a colorless and transparent mixed solution A; S2, adding ferric trichloride and transition metal salt into the mixed solution A obtained in the step S1, and fully and uniformly mixing to obtain a clear and transparent precursor solution B; S3, putting the precursor solution B obtained in the step S2 into a high-temperature stirring reaction kettle with a polytetrafluoroethylene lining, and performing stirring and heat preservation at 120 DEG C for 12-24 hours; and S4, centrifuging, washing and drying the material obtained in the step S3 to obtain the doped alpha-Fe2O3-based sensitive material. The preparation method is simple in synthesis process, high in repeatability and low in cost, and high-temperature calcination and use of a surfactant are not needed. The sensitivity, the stability and the selectivity of the hydrogen sensor made of the sensitive material are remarkably improved.

Description

technical field [0001] The invention belongs to the field of semiconductor metal oxide gas sensors, and in particular relates to a doped sensitive material for improving the performance of a hydrogen sensor, a preparation method and application thereof. Background technique [0002] Hydrogen is a renewable, sustainable and clean energy, and it is regarded as one of the substitutes for traditional fossil fuels. At present, hydrogen fuel has attracted extensive attention and in-depth research, and is widely used in aircraft, rocket engines, automobiles, metallurgy and fuel cells and other fields. However, hydrogen gas is a small, colorless, odorless molecule with high diffusivity, high heat of combustion and low explosive concentration (>4%) in air at the same time. For the sake of safety, rapid detection of hydrogen leakage during hydrogen production, transportation, storage, and use is crucial, so research on hydrogen sensors has been ongoing. [0003] Semiconductor met...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/30G01N27/416C01G49/00C01G49/06
CPCG01N27/304G01N27/4162C01G49/0009C01G49/06Y02A50/20
Inventor 路金林艾天宇尹衍升滕宪斌张怡
Owner GUANGZHOU MARITIME INST
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