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Adsorption type gas detector

A gas detector and adsorption technology, which is applied in the field of gas detection, can solve the problems of low detection limit and insufficient gas detection sensitivity, and achieve the effect of high gas detection sensitivity and multiple types of detection molecules

Inactive Publication Date: 2022-02-08
于孟今
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Traditional semiconductor sensors, solid electrolyte sensors, catalytic combustion sensors, electrochemical gas sensors, and infrared sensors have the disadvantages of insufficient gas detection sensitivity and low detection limit.

Method used

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Experimental program
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Effect test

Embodiment 1

[0020] The invention provides an adsorption gas detector, such as figure 1 As shown, it includes an antiferromagnetic layer 1 , a pinning layer 2 , a barrier layer 3 , a free layer 4 , and a porous material part 6 . The material of the antiferromagnetic layer 1 is a hard magnetic antiferromagnetic material. Specifically, the material of the antiferromagnetic layer 1 is IrMn, PtMn, FeMn. The pinning layer 2 is placed on the antiferromagnetic layer 1 . The material of the pinning layer 2 is a metal or semi-metal with high spin polarizability, specifically, the material of the pinning layer 2 is Co, Fe, CoFe, CoFeB, CoFeAl alloy. The barrier layer 3 is placed on the pinning layer 2 . The material of the barrier layer 3 is aluminum oxide or magnesium oxide. The free layer 4 is placed on the barrier layer 3 . The material of the free layer 4 is soft magnetic material with weak magnetic anisotropy, specifically, the material of the free layer 4 is NiFe alloy, CoFe alloy, CoFeB ...

Embodiment 2

[0025] On the basis of Example 1, such as figure 2 As shown, the shape of the porous material part 6 is a pointed cone. In this way, on the one hand, the porous material portion 6 is less in contact with the sidewall of the hole 5, that is, the porous material portion 6 is less in contact with the free layer 4, so as to reduce the heat transfer generated by the porous material portion 6. To the free layer 4, the heat lost to the outside through the free layer 4 is reduced; on the other hand, the tapered porous material part 6 has more surface area, so that the porous material part 6 can absorb more gas. The effects of these two aspects are beneficial to the barrier layer 3 to absorb more heat, thereby changing the temperature of the barrier layer 3 more, thereby changing the quantum tunneling characteristics of the barrier layer 3 more, thereby changing the temperature of the barrier layer 3 more. The magnetoresistance of the magnetic tunnel junction, enabling higher sensiti...

Embodiment 3

[0027] On the basis of Embodiment 2, the porous material part 6 protrudes from the hole 5 . In this way, the porous material part 6 has more surface area and more volume, and the porous material part 6 can absorb more gas molecules, thereby generating more heat, changing its own weight more, thereby more Change the temperature of the barrier layer 3 and the stress of the barrier layer 3, thereby changing the quantum tunneling characteristics of the barrier layer 3 more, thereby changing the magnetoresistance of the magnetic tunnel junction more, thereby achieving higher sensitivity gas detection .

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Abstract

The invention relates to the field of gas detection, and particularly provides an adsorption type gas detector. A pinning layer is arranged on an antiferromagnetic layer, a barrier layer is arranged on the pinning layer, a free layer is arranged on the barrier layer, holes are formed in the free layer, and a porous material part is arranged on the barrier layer in the holes. In the invention, the pinning layer, the barrier layer and the free layer form a magnetic tunnel junction. During application, a fixed magnetic field is applied to act on the adsorption type gas detector; meanwhile, the adsorption type gas detector is placed in a to-be-tested environment, the porous material part adsorbs gas and releases heat, and the magnetoresistance of the magnetic tunnel junction is changed. The concentration of the gas in the to-be-tested environment is determined according to the change of the magnetoresistance of the magnetic tunnel junction. The magnetoresistance of the magnetic tunnel junction is very sensitive to the quantum tunneling characteristic of the barrier layer, so that the adsorption type gas detector has the advantage of high gas detection sensitivity.

Description

technical field [0001] The invention relates to the field of gas detection, in particular to an adsorption gas detector. Background technique [0002] Gas detection belongs to conventional material detection. The highly sensitive detection of gas plays a very important role in many fields such as industrial production control, environmental protection detection and protection, and medical monitoring. Traditional semiconductor sensors, solid electrolyte sensors, catalytic combustion sensors, electrochemical gas sensors, and infrared sensors have the disadvantages of insufficient gas detection sensitivity and low detection limit. Exploring gas sensors based on new principles will not only help improve the sensitivity of gas detectors, but also help expand the application range of gas detectors. Contents of the invention [0003] In order to solve the above problems, the present invention provides an adsorption gas detector, comprising an antiferromagnetic layer, a pinning ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/74
CPCG01N27/74
Inventor 于孟今
Owner 于孟今
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