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P-type metal oxide gas sensor and its preparation and use method

A gas sensor and oxide technology, applied in the direction of material resistance, can solve the problems of measuring gas range and performance limitations

Active Publication Date: 2021-04-20
HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this product can determine the type of gas combined with the previous calibration work, it also has shortcomings. First, the product is an N-type metal oxide gas sensor, which is restricted by its N-type composition, and the range and performance of the gas can be measured. There are certain restrictions; secondly, the variable temperature thermal modulation voltage signal measured during the calibration process not only includes the characteristic information of the gas molecules to be measured, but also includes the resistance-temperature characteristics of the N-type metal oxide gas sensor itself and Electrical noise, and the latter two signals are likely to cover up the intrinsic characteristic information of the gas molecules to be measured

Method used

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  • P-type metal oxide gas sensor and its preparation and use method
  • P-type metal oxide gas sensor and its preparation and use method
  • P-type metal oxide gas sensor and its preparation and use method

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Experimental program
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Embodiment 1

[0048] The concrete steps of preparation are:

[0049] Step 1, first according to the weight ratio of 0.14wt% bacterial cellulose hydrogel and 1mmol / L metal salt solution is 20:22, immerse the bacterial cellulose hydrogel in the metal salt solution and let it stand for 12h, take out Finally, it is washed with deionized water; wherein, the bacterial cellulose in the bacterial cellulose hydrogel is cellulose of the genus Acetobacter, and the metal salt solution is nickel acetate solution in the acetate metal salt solution. Then it was freeze-dried at -50° C. for 2 days to obtain a cellulose xerogel with metal ions adsorbed thereon.

[0050] In step 2, the cellulose xerogel on which the metal ions are adsorbed is first calcined at 400° C. for 5 hours to obtain flocculent metal oxide particles. Then grind the mixture of the flocculent metal oxide particles and the volatile reagent; wherein the volatile reagent is water to obtain the metal oxide nano particle slurry.

[0051] In ...

Embodiment 2

[0053] The concrete steps of preparation are:

[0054] Step 1, according to the weight ratio of 0.145wt% bacterial cellulose hydrogel and 0.75mmol / L metal salt solution is 65:21, immerse the bacterial cellulose hydrogel in the metal salt solution and let it stand for 21h, After being taken out, it is rinsed with deionized water; wherein, the bacterial cellulose in the bacterial cellulose hydrogel is cellulose of the genus Acetobacter, and the metal salt solution is nickel acetate solution in the acetate metal salt solution. Then it was freeze-dried at -53°C for 1.8 days to obtain a cellulose xerogel with metal ions adsorbed thereon.

[0055] In step 2, the cellulose xerogel on which the metal ions are adsorbed is first calcined at 500° C. for 4 hours to obtain flocculent metal oxide particles. Then grind the mixture of the flocculent metal oxide particles and the volatile reagent; wherein the volatile reagent is water to obtain the metal oxide nano particle slurry.

[0056] ...

Embodiment 3

[0058] The concrete steps of preparation are:

[0059] Step 1, according to the weight ratio of 0.15wt% bacterial cellulose hydrogel and 0.5mmol / L metal salt solution of 110:20, immerse the bacterial cellulose hydrogel in the metal salt solution and let it stand for 30h, After being taken out, it is rinsed with deionized water; wherein, the bacterial cellulose in the bacterial cellulose hydrogel is cellulose of the genus Acetobacter, and the metal salt solution is nickel acetate solution in the acetate metal salt solution. Then it was freeze-dried at -55°C for 1.5 days to obtain a cellulose xerogel with metal ions adsorbed thereon.

[0060] In step 2, the cellulose xerogel on which the metal ions are adsorbed is first calcined at 600° C. for 3 hours to obtain flocculent metal oxide particles. Then grind the mixture of the flocculent metal oxide particles and the volatile reagent; wherein the volatile reagent is water to obtain the metal oxide nano particle slurry.

[0061] I...

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Abstract

The invention discloses a P-type metal oxide gas sensor and its preparation and use methods. The sensor consists of a ceramic substrate with test and heating electrodes covered with P-type metal oxide nanoparticles; the method is to first immerse the bacterial cellulose hydrogel in a metal salt solution and then rinse it, freeze-dry it, and then , firstly calcining the obtained cellulose xerogel adsorbed with metal ions, then grinding the obtained mixture of flocculent metal oxide particles and volatile reagents, and finally, coating the obtained metal oxide nanoparticle slurry After aging on the ceramic substrate, the target product is obtained; it is calibrated in advance, and then according to the measured signal belongs to the envelope of the volatile organic compound in the calibration result, or from the envelope of the volatile organic compound. The distance is the closest, and the volatile organic compound of the gas measured this time is obtained. It is easily and widely commercialized for accurate identification and detection of a variety of volatile organic compounds.

Description

technical field [0001] The invention relates to a gas sensor and its preparation and use method, in particular to a P-type metal oxide gas sensor and its preparation and use method. Background technique [0002] Metal oxide semiconductor gas sensors with the advantages of small size, low power consumption, high sensitivity, and good silicon process compatibility have been widely used in various industries of the national economy, military, scientific research and other fields. However, its poor selectivity is the biggest obstacle restricting its application: the traditional constant temperature test - static or dynamic acquisition of characteristic parameters (sensitivity, response / recovery time) of adsorbed gas molecules are too few to distinguish the types of gas molecules. In order to solve this problem, people try to perform thermal modulation on a single gas sensor under variable temperature. By analyzing the thermal modulation signal of a single sensor to different gas...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N27/12
Inventor 孟钢刘弘禹方晓东邓赞红王时茂
Owner HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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