High-sensitivity electric field sensor formed by polyamine molecule modified carbon fibers

An electric field sensor, high-sensitivity technology, used in instruments, scientific instruments, electrical/magnetic exploration, etc., can solve the problems of difficult to detect low-frequency weak signals, poor electrode stability, reduced sensitivity, etc., to achieve a wide range of applications, low cost, The effect of stabilizing physical and chemical properties

Inactive Publication Date: 2020-07-28
OCEAN UNIV OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this type of electrode generally has poor stability, high self-noise, and large low-frequency capacitive reactance, which reduces sensitivity, making it difficult for the electrode to detect low-frequency weak signals

Method used

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  • High-sensitivity electric field sensor formed by polyamine molecule modified carbon fibers
  • High-sensitivity electric field sensor formed by polyamine molecule modified carbon fibers
  • High-sensitivity electric field sensor formed by polyamine molecule modified carbon fibers

Examples

Experimental program
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Effect test

Embodiment 1

[0039] Such as figure 1 As shown, the present invention prepares a carbon fiber rich in nitrogen groups: first, a certain amount of carbon fiber is added to the nitric acid solution (the concentration of nitric acid is 8 mol / L ~ 16 mol / L), and the temperature is oscillated at 85 ℃ ~ 95 ℃ React for 2 h to 4 h, wash with water several times until the washing solution is neutral, and dry in a blast drying oven at 60 °C to 80 °C to obtain carbon oxide fibers. Then put a certain amount of oxidized carbon fiber into the aqueous solution of triethylenetetramine (TETA) (the concentration of TETA is 0.5 g / L ~ 1 g / L) and ultrasonic for 30 min ~ 60 min, so that the carbon fiber and triethylenetetramine Fully contact; then take out the carbon fiber coated with triethylenetetramine molecule (TETA) solution and put it in a box-type resistance furnace heated to 350 ℃ ~ 450 ℃ for 10 min ~ 15 min; finally put the carbon fiber after heat treatment in boiling water The clean carbon fiber was ob...

Embodiment 2

[0041] Such as figure 1 As shown, the present invention prepares a carbon fiber rich in nitrogen groups: first, a certain amount of carbon fiber is added to the nitric acid solution (the concentration of nitric acid is 8 mol / L ~ 16 mol / L), and the temperature is oscillated at 85 ℃ ~ 95 ℃ React for 2 h to 4 h, wash with water several times until the washing solution is neutral, and dry in a blast drying oven at 60 °C to 80 °C to obtain carbon oxide fibers. Then put a certain amount of oxidized carbon fiber into the aqueous solution of polyethylene polyamine (HEPA) (the concentration of HEPA is 0.5 g / L ~ 1 g / L) and sonicate for 30 min ~ 60 min to make the carbon fiber and polyethylene polyamine Fully contact; then take out the carbon fiber coated with polyethylene polyamine molecule (HEPA) solution and put it into a box-type resistance furnace heated to 550 ℃ ~ 650 ℃ for 2 min ~ 5 min; finally heat treated carbon fiber with Clean carbon fibers were obtained by washing with boil...

Embodiment 3

[0043]The present invention prepares a carbon fiber rich in nitrogen groups: first, a certain amount of carbon fiber is added to a nitric acid solution (the concentration of nitric acid is 8 mol / L ~ 16 mol / L), and the reaction is carried out at a constant temperature of 85 ℃ ~ 95 ℃ for 2 h ~ 4 h, washed with water several times until the washing solution is neutral, and dried in a blast drying oven at 60 ℃ ~ 80 ℃ to obtain carbon oxide fibers. Then put a certain amount of carbon oxide fiber into the ethanol suspension of melamine (the mass ratio of melamine to ethanol is 1:5~10), stir at room temperature for 5~10 hours, and then boil the mixture to completely evaporate the ethanol; The remaining carbon fibers were heat-treated (300 °C ~ 600 °C) for a period of time (0.5 h ~ 3 h); finally, the heat-treated carbon fibers were rinsed with boiling water several times to obtain clean carbon fibers, which were dried and used as electrode materials for electric field sensors.

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Abstract

The invention discloses a high-sensitivity carbon fiber electric field sensor. The sensor has high-sensitivity response to an electric field signal in water. According to the sensor, carbon fibers aretaken as an electrode material; grafting and modifying are performed through a polyamine molecular substance; cutting and fixing, lead leading out and sealing are performed, so that the sensor can beprepared. The surfaces of the carbon fibers contain rich active nitrogen-containing groups, and surface double-electric-layer change caused by external electric field change can be converted into electric signals. The carbon fiber electric field sensor has the advantages of high sensitivity, small potential drift and low noise, and can be effectively used for measuring low-frequency weak electricfield signals in waters such as oceans or rivers.

Description

technical field [0001] The invention relates to a carbon fiber sensor, in particular to a structural design and preparation method of a high-sensitivity carbon fiber electric field sensor for detecting underwater electric fields. Background technique [0002] The ocean not only contains rich oil, gas and mineral resources, but also provides a vast space for human beings. [0003] With the emphasis on the ocean and the development of marine and earth science and technology, human beings are increasingly exploiting seabed resources, and marine electromagnetic methods have also become an important means for human exploration and development of the seabed. However, due to the special environment of the ocean, the electromagnetic field in the ocean is dominated by extremely low-frequency weak signals. Therefore, preparing a high-sensitivity, high-stability, and low-noise marine electric field sensor for low-frequency weak signals has become one of the important research contents...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V3/08
CPCG01V3/08Y02A90/30
Inventor 宰学荣郭满付玉彬杨志伟赵鸿浩刘昂
Owner OCEAN UNIV OF CHINA
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