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A kind of liquid sensor and its preparation method and application

A liquid sensor, organic solvent technology, applied in the direction of material resistance, etc., can solve the problem of inability to detect liquids

Active Publication Date: 2021-03-09
BEIHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The traditional device used to monitor whether the liquid is leaking is a liquid sensor. The working principle of most current liquid sensors is to make the functional material of the sensor expand and the resistance change, so as to achieve the purpose of detecting organic solvents, which requires the sensor to be soaked in organic solvents , therefore, cannot detect trace liquid

Method used

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  • A kind of liquid sensor and its preparation method and application
  • A kind of liquid sensor and its preparation method and application
  • A kind of liquid sensor and its preparation method and application

Examples

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preparation example Construction

[0037] The present invention also provides a method of preparing a liquid sensor according to the above technical scheme, comprising the steps of:

[0038] Laser irradiation is carried out on both sides of polyimide paper to obtain graphene paper;

[0039] A silver paste is applied to both ends of the graphinyl paper, and the silver coating is formed, and the liquid sensor is obtained.

[0040] The present invention performs laser irradiation to both sides of the polyimide paper to obtain graphe paper. In the present invention, the polyimide (PI) paper is a commercially available product well known to those skilled in the art, and the polyimide paper is preferably 10 cm × 10 cm.

[0041] In the present invention, the laser light is preferably a carbon dioxide laser, preferably 9.3 to 12 μm, more preferably 9.5 to 11.5 μm; the irradiation method is preferably a filling scan mode; the image density of the laser irradiation is preferably from 100 to 1000 ppi, More preferably, 200 to ...

Embodiment 1

[0052] Polyimide (PI) paper is purchased in the commercial market. Equipped with a wavelength of 10.6μm CO 2 The laser laser irradiation system (DLS 2.3, Universal Laser Systems, INC) is illuminated by filling scan mode, and the laser irradiation parameter is: the image density is fixed to 500ppi, the scan rate is 7inch / s, and the area of ​​the PI paper is 10 × 10 cm. 2 Single-sided scan time is 8 minutes, single sheet 100cm 2 The total LIGP has a total time of 16 min, the scanning power is 10W, and the parameters of the two sides are the same.

[0053] The resulting graphe paper was cut into a sample of 1 cm × 1 cm, and the silver slurry layer was coated between the two pairs, forming a silver coating having a width of 0.1 mm, length of 1 cm, resulting in figure 1 The liquid sensor shown. Add the organic solvent to the graphe paper, adopted figure 2 Expressive diagram showing the infiltration: figure 2 The above figure shows the structural schematic structural view of the gr...

Embodiment 2～5

[0055] The graphe paper was prepared according to the first embodiment, and the power difference was different, and the power of Example 2 was 11 W, and the power of Example 3 was 12 W, Example 4 is 13 W, and Example 5 is 15W.

[0056] The graphe paper obtained in Example 1, Example 3 and Example 5 was used as an example, and the resulting graphene paper line SEM was characterized to study the change of the microstructure of the graphite paper obtained at different power, characterized image 3 Indicated. image 3 The SEM map of the graphe paper obtained by the left to right is shown in Example 1, Example 3 and Example 5, respectively, by the figure, as the power increases, the microstructure of graphene paper from more small hole structures Gradually transition to the middle hole, then transform to the large pore structure consisting of the fibrous shape, which directly affects the specific surface area of ​​the stone insert.

[0057] The specific surface area of ​​the Si-MP mode...

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Abstract

The invention belongs to the technical field of liquid detection, and in particular relates to a liquid sensor and its preparation method and application. The liquid sensor provided by the invention comprises graphene paper and silver coating, and the silver coating is coated on the surfaces of opposite ends of the graphene paper; the specific surface area of ​​the graphene paper is 60-200m 2 / g. The liquid sensor provided by the invention has the advantages of being able to realize trace detection of organic solvents, having excellent cycle stability characteristics, and being able to identify components of trace organic solvents in combination with vapor pressures of different solvents. The results of the examples show that when the liquid sensor provided by the present invention is used to detect acetone, the minimum detection amount can reach 0.3 μL, and the variation of the resistance response is 0.1%.

Description

Technical field [0001] The present invention belongs to the field of liquid detection, and more particularly to a liquid sensor and a preparation method thereof. Background technique [0002] In industrial production process, liquid materials are widely used, and liquid materials, especially organic liquid materials are leaked in process production, not only affect the normal process of process, but also bring great harm to staff and the environment. It is necessary to use the equipment to leak monitoring of liquid materials. Traditional devices for monitoring whether liquids leaked are liquid sensors. Most of the liquid sensor work principle is to expand and resist the functional material of the sensor, thereby achieving the purpose of detecting organic solvents, which requires soaking sensors in an organic solvent Therefore, the micro liquid cannot be detected. Inventive content [0003] It is an object of the present invention to provide a liquid sensor and a preparation meth...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N27/06
CPCG01N27/06
Inventor 罗斯达王亚楠
Owner BEIHANG UNIV
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