P-type metal oxide gas sensor and preparation and application method thereof

A gas sensor and oxide technology, applied in the direction of material resistance, can solve the problems of measuring gas range and performance limitations, and achieve the effect of improving accuracy and scientific preparation method

Active Publication Date: 2019-05-03
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 preparation and application method thereof
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  • P-type metal oxide gas sensor and preparation and application method thereof

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Experimental program
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Effect test

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 a preparation and application method thereof. The sensor consists of a ceramic base which is attached with test and heating electrodes and coated with P-type metal oxide nano particles. The method is characterized in that bacterial cellulose hydrogel is first immersed in the metal salt solution, is then subjected to standing, rinsed and then lyophilized, the obtained cellulose xerogel attached with metal ions is first calcined, mixture of the obtained flocculent metal oxide particles and volatile reagent is further ground, and lastly, the obtained metal oxide nanoparticle slurry is coated on a ceramic substrate and aged, and a desired product is obtained; The method is advantaged in that calibration processing is performed in advance, according to what kind of volatile organic compound (VOC) envelope the measured signal belong to in the calibration result, or from what kind of volatile organic compound (VOC) envelope the distance is the shortest, what kind of volatile organic compound the gas measured at the time is obtained. The method is advantaged in that the method is extremely easy to be widely commercialized for accurate identification 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 Applications(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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