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Liquid sensor, and preparation method and application thereof

A technology of liquid sensor and graphene paper, applied in the direction of material resistance, etc., can solve the problem of inability to detect liquid

Active Publication Date: 2019-07-30
BEIHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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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  • Liquid sensor, and preparation method and application thereof
  • Liquid sensor, and preparation method and application thereof
  • Liquid sensor, and preparation method and application thereof

Examples

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preparation example Construction

[0037] The present invention also provides a method for preparing the liquid sensor described in the above technical solution, comprising the following steps:

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

[0039] Coating silver paste on opposite ends of the graphene paper, forming a silver coating after drying, and obtaining a liquid sensor.

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

[0041] In the present invention, the laser irradiation is preferably carbon dioxide laser, the wavelength is preferably 9.3-12 μm, more preferably 9.5-11.5 μm; the irradiation method is preferably a fill-scan mode; the image density of the laser irradiation is preferably 100-1000PPI,...

Embodiment 1

[0052] Polyimide (PI) paper was purchased commercially. Equipped with CO with a wavelength of 10.6 μm 2 The laser irradiation system of the laser (DLS 2.3, Universal Laser Systems, Inc) adopts the filling and scanning mode irradiation, and the laser irradiation parameters are: the image density is fixed at 500PPI, the scanning rate is 7inch / s, and the area of ​​PI paper for one scan is 10×10cm 2 , single-sided scanning time is 8min, single-sided 100cm 2 The total preparation time of LIGP was 16min, the scanning power was 10W, and the scanning parameters on both sides were the same.

[0053] Gained graphene paper is cut into the sample of 1cm * 1cm, is coated with silver paste layer at two opposite sides, and the formation width is 0.1mm, and length is the silver coating of 1cm, obtains as figure 1 The liquid sensor shown. Add the organic solvent dropwise on the graphene paper, using figure 2 Indicates the schematic diagram of infiltration: figure 2 The upper picture is ...

Embodiment 2～5

[0055] Prepare graphene paper in the manner of Example 1, the difference is that the power is different, the power of Example 2 is 11W, the power of Example 3 is 12W, Example 4 is 13W, and Example 5 is 15W.

[0056] Taking the obtained graphene paper of embodiment 1, embodiment 3 and embodiment 5 as example, the SEM characterization of the obtained graphene paper is carried out, to study the change situation of the microstructure of the obtained graphene paper under different powers, the characterization result is as follows image 3 shown. image 3 Among them, from left to right are the SEM pictures of the graphene paper obtained in embodiment 1, embodiment 3 and embodiment 5 respectively, as can be seen from the figure, with the increase of power, the microstructure of graphene paper changes from more small hole structure Gradually transform to mesoporous knots, and then transform to macroporous structures composed of fibers, which directly affects the specific surface area ...

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Abstract

The invention belongs to the technical field of liquid detection, and in particular to a liquid sensor, and a preparation method and application thereof. The liquid sensor provided by the invention comprises graphene paper and silver coating, and the silver coating is coated on the surfaces of two opposite ends of the graphene paper; and the specific surface area of the graphene paper is 60-200 m2 / g. The liquid sensor provided by the invention has various advantages of realizing the micro-detection of organic solvents, having excellent cycle stability characteristic, and being capable of combining vapor pressures of different solvents to identify the components of trace amount of organic solvents. The results of embodiments show that when acetone is detected by the liquid sensor provided by the invention, the minimum detection amount can reach 0.3 mu L, and the resistance response change amount is 0.1%.

Description

technical field [0001] The invention belongs to the technical field of liquid detection, and in particular relates to a liquid sensor and its preparation method and application. Background technique [0002] In industrial production processes, liquid materials are widely used. Once liquid materials, especially organic liquid materials, leak during process production, it will not only affect the normal progress of the process, but also bring great harm to the staff and the environment. Therefore, , It is necessary to use equipment to monitor the leakage of liquid materials. 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, trace amounts of liquid cannot be detected. Conte...

Claims

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Application Information

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IPC IPC(8): G01N27/06
CPCG01N27/06
Inventor 罗斯达王亚楠
Owner BEIHANG UNIV
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