A graphene film-based low-frequency acoustic wave detector

A graphene film, low-frequency sound wave technology, applied in graphene, measuring ultrasonic/sonic/infrasonic waves, instruments, etc., can solve the problems of unsuitable sound waves, insufficient strength, low absolute mechanics, etc., to easily withstand high-intensity sound waves, improve Strength and thermal stability, effect of increasing ultimate breaking strength

Active Publication Date: 2021-01-01
HANGZHOU GAOXI TECH CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] At present, graphene-based acoustic wave detectors are mainly based on single-layer graphene, but its absolute mechanics is low and it is easy to break; while the thickness of micron-thick graphene is too thick, it is not sensitive to sound waves, and its intensity is too low to be suitable for sound wave detection; nanometer-thick Graphene is between the two and has the advantages of both, but its strength is still insufficient
In addition, too high intensity can only detect high-frequency sound waves, and cannot produce obvious responses to low-frequency sound waves

Method used

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  • A graphene film-based low-frequency acoustic wave detector
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  • A graphene film-based low-frequency acoustic wave detector

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] (1) Configure a 4 mg / mL graphene oxide aqueous solution, add 10% volume fuming nitric acid, reflux at 100 degrees Celsius for 6 hours, and then centrifuge and wash to obtain porous graphene oxide. It is measured that its carbon atom content is 11.4% less than that before etching.

[0027] The porous graphene oxide was formulated into a graphene oxide aqueous solution with a concentration of 0.5ug / mL, and the hydrophilic polytetrafluoroethylene membrane was used as the substrate to form a membrane by suction filtration.

[0028] (2) Put the graphene oxide film attached to the hydrophilic polytetrafluoroethylene film in a closed container, and fumigate from the bottom to the top for 1 hour at a high temperature of 80 degrees HI.

[0029] (3) The melted solid transfer agent camphor is uniformly coated on the surface of the reduced graphene oxide film by evaporation, casting, etc., and slowly cooled at room temperature, and the film and the substrate are separated.

[0030...

Embodiment 2

[0037] (1) Configure a 2 mg / mL graphene oxide aqueous solution, slowly add 50% volume fuming nitric acid, reflux at 120 degrees Celsius for 1 hour, and then centrifuge and wash to obtain porous graphene oxide. It is measured that its carbon atom content is 36.8% less than that before etching.

[0038] (2) Porous graphene oxide was prepared into a graphene oxide aqueous solution with a concentration of 10ug / mL, and the PC membrane was used as the substrate to form a film by suction filtration.

[0039](2) Put the graphene oxide film attached to the PC film in a closed container, and fumigate from the bottom to the top at 100 degrees HI for 0.1 h.

[0040] (3) Uniformly coat the melted solid transfer agent naphthalene on the surface of the reduced graphene oxide film by evaporation, casting, etc., and slowly cool it at room temperature.

[0041] (4) Slowly volatilize the graphene film supported by the solid transfer agent obtained above at 80 to obtain an independent self-suppo...

Embodiment 3

[0048] (1) Configure a 3 mg / mL graphene oxide aqueous solution, slowly add 20% volume fuming nitric acid into it, reflux at 100 degrees Celsius for 5 hours, and then centrifuge and wash to obtain porous graphene oxide.

[0049] (2) Porous graphene oxide was prepared into a graphene oxide aqueous solution with a concentration of 1 ug / mL, and the AAO membrane was used as the substrate to form a film by suction filtration.

[0050] (2) Put the graphene oxide film attached to the AAO film in an airtight container, and fumigate from the bottom to the top for 0.5 h at a high temperature of 90 degrees HI.

[0051] (3) Uniformly coat the melted solid transfer agent sulfur on the surface of the reduced graphene oxide film by evaporation, casting, etc., and slowly cool it at room temperature.

[0052] (4) Slowly volatilize the graphene film supported by the solid transfer agent obtained above at 120 degrees to obtain an independent self-supporting graphene film.

[0053] (5) Spray one ...

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Abstract

The invention discloses a low-frequency sound wave detector for a graphene film substrate, and the detector can take a high-strength graphene film as a main detection device. Through the assembly design, a capacitor which takes graphene / conductive substrate as two electrodes is formed. The sound wave vibration causes the vibration of the graphene film to change the distance between the graphene film and the conductive substrate, thereby arousing the change of capacitance, and generate a current signal. The high-strength graphene is obtained through the steps of etching perforation, vacuum filtering film forming, chemical reduction, solid phase transfer, metal coating, medium temperature carbonization, chlorine chlorination and high-temperature graphitization. The film is of a graphene structure, and there are a large number of interlayer cross-linked structures between sheets. The overall thickness of the film is 20-50nm. The graphene film is controllable in conductivity, is adjustablein strength and can be used as a low-frequency sound wave detection device.

Description

technical field [0001] The invention relates to high-performance devices, in particular to a graphene film-based low-frequency acoustic wave detector. Background technique [0002] In 2010, two professors Andre GeiM and Konstantin Novoselov from the University of Manchester won the Nobel Prize in Physics for their first successful separation of stable graphene, which set off a wave of research on graphene around the world. Graphene has excellent electrical properties (electron mobility at room temperature can reach 2×10 5 m 2 / Vs), outstanding thermal conductivity (5000W / (MK), extraordinary specific surface area (2630M 2 / g), its Young's modulus (1100GPa) and breaking strength (125GPa). The excellent electrical and thermal conductivity of graphene completely exceeds that of metals. At the same time, graphene has the advantages of high temperature resistance and corrosion resistance, and its good mechanical properties and low density make it have the potential to replace m...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01H11/06C01B32/184C01B32/194
CPCC01B32/184C01B32/194G01H11/06
Inventor 高超彭蠡刘一晗郭燕
Owner HANGZHOU GAOXI TECH CO LTD
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