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A high-strength graphene film-based acoustic wave detector

A technology of graphene film and high-strength graphite, which is applied in the direction of measuring ultrasonic/sonic/infrasonic waves, instruments, measuring devices, etc. It can solve the problems of inability to detect high-frequency sound waves, insufficient strength, and low absolute mechanics

Active Publication Date: 2020-11-17
ZHEJIANG UNIV
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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 it is still not strong enough to detect high-frequency sound waves

Method used

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  • A high-strength graphene film-based acoustic wave detector
  • A high-strength graphene film-based acoustic wave detector
  • A high-strength graphene film-based acoustic wave detector

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] (1) Graphene oxide was prepared into a graphene oxide aqueous solution with a concentration of 0.5ug / mL, and a hydrophilic polytetrafluoroethylene membrane was used as a 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] (4) Slowly volatilize the solid transfer agent from the graphene film supported by the solid transfer agent obtained above at 40 degrees to obtain an independent self-supporting graphene film.

[0031] (5) Spraying a layer of metal titanium on the surface of the chemically reduced graphene film by mea...

Embodiment 2

[0037] (1) Graphene oxide was prepared into a graphene oxide aqueous solution with a concentration of 10ug / mL, and the PC film was used as the substrate to form a film by suction filtration.

[0038] (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.

[0039] (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.

[0040] (4) Slowly volatilize the graphene film supported by the solid transfer agent obtained above at 80 to obtain an independent self-supporting graphene film.

[0041] (5) Spraying a layer of metal titanium on the surface of the chemically reduced graphene film by means of magnetron sputtering. By controlling the sputtering parameters, the molar weight of the finally sputtered metal nanoparticles is 18.4% of the molar weight of carbon atoms...

Embodiment 3

[0047] (1) Graphene oxide is prepared into a graphene oxide aqueous solution with a concentration of 1 ug / mL, and the AAO membrane is used as the substrate to form a film by suction filtration.

[0048] (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.

[0049] (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.

[0050] (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.

[0051] (5) Spray one layer of metal cobalt on the graphene film surface of chemical reduction with the mode of magnetron sputtering, by controlling the sputtering parameter, the molar weight of the metal nanoparticle of final sputtering is the carbon a...

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Abstract

The invention discloses a high-strength graphene-film-based acoustic wave detector. The high-strength graphene-film-based acoustic wave detector uses a high-strength graphene film as a main detector,and forms a capacitor through assembly design. Acoustic vibration causes vibration of the graphene film, thus a distance between the graphene film and a substrate (another pole of the capacitor) changes, thereby causing a change in capacitance and generating a current signal. The high-strength graphene film is prepared by implementing the steps of vacuum filtration and film formation, chemical reduction, solid phase transfer, metal spraying, medium temperature carbonization, chlorination by using chlorine, high temperature graphitization and the like. The overall thin film is of a graphene structure, and a large number of interlayer cross-linked structures are formed between slice layers. The thickness of the overall thin film ranges from 20 to 50 nm. The graphene film has controllable conductivity and adjustable strength, and can be used as a high-strength acoustic detector.

Description

technical field [0001] The invention relates to a high-performance nanometer material and a preparation method thereof, in particular to a high-strength graphene film-based 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 d...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01H11/06
CPCG01H11/06
Inventor 高超彭蠡俞丹萍沈颖卡西克燕.戈坡塞米
Owner ZHEJIANG UNIV
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