Preparation method of aluminum-titanium codoped ZnO-based acetone gas sensor

A gas sensor and co-doping technology, which is applied in the direction of instruments, scientific instruments, measuring devices, etc., can solve the problems of affecting the stability and service life of components, low detection sensitivity and selectivity, increasing power consumption of components, etc., and achieve shortening Effects of response recovery time, increase in specific surface area, and increase in sensitivity

Inactive Publication Date: 2018-03-20
HEBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although some commercially available gas sensors can also be used to detect acetone, most of them have low detection sensitivity and selectivity and cannot meet the needs of various aspects.
And generally require a higher operating temperature, greater than 300 ° C, which not only increases the power consumption of the component, but also affects the stability and service life of the component

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] 1. Measure deionized water and absolute ethanol at a volume ratio of 1:1, mix them evenly, and use them as a solvent; prepare a zinc acetate solution with a concentration of 0.8 mol / L and a NaOH solution with a concentration of 1.6 mol / L; press Al , Zn molar ratio 1:11, add Al(NO 3 ) 3 ·9H 2 O, add CTAB to the zinc acetate solution according to the molar ratio of CTAB to Zn 1:4; add the NaOH solution dropwise to the zinc acetate solution, and stir, the dropping rate is 0.1ml / min, the stirring speed is 90r / min, and the PH value is When it reaches 7, the dripping is stopped, and stirring is continued for 0.5 hours to obtain a milky white sol. Place the sol in a fume hood and let it stand for 12 hours at room temperature to obtain uniform and stable Zn(OH) 2 colloid.

[0024] 2. Measure the amount of absolute ethanol and glacial acetic acid at a volume ratio of 10:1, and mix them evenly; add a quantitative amount of butyl titanate to the mixed solution at a volume ratio of 1:...

Embodiment 2

[0030] 1. Measure deionized water and absolute ethanol at a volume ratio of 1:1.5, mix them evenly, and use them as a solvent; prepare a zinc acetate solution with a concentration of 0.9mol / L and a NaOH solution with a concentration of 1.8mol / L; press Al , Zn molar ratio 1:13 is added to the zinc acetate solution with Al(NO 3 ) 3 ·9H 2 O, add CTAB to the zinc acetate solution according to the molar ratio of CTAB to Zn 1:4.5; add the NaOH solution dropwise to the zinc acetate solution, and stir, the dropping rate is 0.3ml / min, the stirring speed is 100r / min, and the PH value is When it reaches 7, the dripping is stopped, and stirring is continued for 45 minutes to obtain a milky white sol. Place the sol in a fume hood and let stand for 18 hours at room temperature to obtain uniform and stable Zn(OH) 2 colloid.

[0031] 2. Measure the amount of absolute ethanol and glacial acetic acid at a volume ratio of 8:1, and mix them evenly; add a quantitative amount of butyl titanate to the ...

Embodiment 3

[0037] 1. Measure deionized water and absolute ethanol in a volume ratio of 1:2, mix them evenly, and use them as a solvent; prepare a zinc acetate solution with a concentration of 1mol / L and a NaOH solution with a concentration of 2mol / L; press Al, Zn The molar ratio of 1:15 was added to the zinc acetate solution with Al(NO 3 ) 3 ·9H 2 O, add CTAB to the zinc acetate solution according to the molar ratio of CTAB to Zn 1:5; add the NaOH solution dropwise to the zinc acetate solution, and stir, the dropping rate is 0.5ml / min, the stirring speed is 120r / min, and the pH is When it reaches 7, the dropping is stopped, and stirring is continued for 1 hour to obtain a milky white sol. Put the sol in a fume hood and let stand for 24 hours at room temperature to obtain uniform and stable Zn(OH) 2 colloid.

[0038] 2. Measure the amount of absolute ethanol and glacial acetic acid in a volume ratio of 5:1, and mix them evenly; add a quantitative amount of butyl titanate to the mixed solutio...

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PUM

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Abstract

The invention relates to a preparation method of an aluminum-titanium codoped ZnO-based acetone gas sensor. The preparation method is applicable to the field of preparation of gas sensor device with high selectivity characteristic on acetone steam. The preparation method comprises the following steps: preparing Zn(OH)2 sol by adopting a sol-gel method, quantitatively adding dopants, namely aluminum nitrate and hexadecyl trimethyl ammonium bromide, and additionally preparing Ti(OH)4 sol as a titanium doping agent; respectively drying, grinding and cleaning the two kinds of colloids, mixing thetitanium doping agent and Zn(OH)2 powder according to a molar ratio of aluminum to titanium of 1:(1-3), then annealing, mixing a powder material with hexadecyl trimethyl ammonium bromide, coating theceramic tube, and annealing again, so that a side heating type thick film gas-sensitive element is obtained; and ageing the element for 5-7 days. The preparation method provided by the invention is simple, the obtained element has good selectivity on acetone, and effective detection on trace amount of acetone is realized.

Description

Technical field [0001] The invention belongs to a method for preparing a gas sensor, and particularly relates to a method for preparing an aluminum-titanium co-doped zinc oxide-based acetone gas sensor by a sol-gel method. Background technique [0002] Today, the world is vigorously developing the Internet of Things technology, and the Internet of Things has become a research hotspot. As one of the key technologies of the Internet of Things, sensors are the towers of the "Pyramid" of the Internet of Things and constitute the basic unit of the Internet of Things. It plays an irreplaceable role and is the largest and most basic link in the entire chain of total demand. [0003] Gas sensor is an important branch of sensor, which is of great significance in protecting the safety of human life and property. Among them, metal oxide semiconductor gas sensors with high sensitivity, fast response, simple structure, and low price have attracted much attention. ZnO, due to its abundant mater...

Claims

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Application Information

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IPC IPC(8): G01N27/04
CPCG01N27/041
Inventor 潘国峰郭学海高宝红何平
Owner HEBEI UNIV OF TECH
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