Foldable electrothermal film device based on graphene

A technology of graphene and electric heating film, which is applied in the direction of graphene, electrical components, electric heating devices, etc., can solve the problems of insufficient size of graphene oxide, unclear flexibility, and inability to meet the rapid development of science and technology, so as to improve the electrical and thermal conductivity, wide The effect of applying potential

Active Publication Date: 2016-07-13
ZHEJIANG TANGUSHANGXI MATERIAL SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] But at present, the size of graphene oxide itself is insufficient, and it contains a lot of fragments, so that it has not been developed enough in thermal conductivity, and its thermal conductivity is limited to 1400W / mK, which cannot meet the needs of rapid technological development.
Moreover, the lack of film structure design makes its flexibility unclear, which limits its application in flexible devices.

Method used

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  • Foldable electrothermal film device based on graphene
  • Foldable electrothermal film device based on graphene
  • Foldable electrothermal film device based on graphene

Examples

Experimental program
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Effect test

Embodiment 1

[0027] Example 1: A super-flexible graphene electrothermal film is prepared by using non-fragmented super-large graphene oxide.

[0028] Graphene oxide with an average size larger than 100um was formulated into a graphene oxide aqueous solution with a concentration of 6mg / mL, and ammonium bicarbonate with a mass fraction of 0.1 was added to the solution, and after ultrasonic dispersion, it was poured on a mold plate and dried to form a graphene oxide film, and then Reduction with hydrazine hydrate reducing agent; the reduced graphene film was gradually heated up to 500°C in an inert gas atmosphere and kept for 2 hours; gradually raised to 1000°C in an inert gas atmosphere and kept for 3 hours; gradually heated to 2500°C, heat preservation for 4 hours, and the porous graphene film can be obtained after natural cooling. After the graphene film is pressed under high pressure, the PDMS insulating protective layer is coated on both sides to form an electric heating film, and electr...

Embodiment 2

[0035] Graphene oxide with an average size greater than 100um was formulated into a graphene oxide aqueous solution with a concentration of 30mg / mL, 5% urea was added to the solution, and after ultrasonic dispersion, it was poured on a mold plate and dried to form a graphene oxide film, and then used The hydrogen iodide reducing agent is used for reduction; the reduced graphene film is subjected to three-step heat treatment in an inert gas atmosphere according to the heat treatment methods shown in Table 1 to Table 3; the porous graphene film can be obtained after natural cooling. After the graphene film is pressed under high pressure, the PDMS insulating protective layer is coated on both sides to form an electric heating film, and electrodes are respectively fixed on both ends of the electric heating film, and the electrodes are connected to the graphene electric heating film. The pressure of the pressing process is 200MP, and the time is 300h.

[0036] Table 1: The heating ...

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Abstract

The invention discloses a foldable electrothermal film device based on graphene.The foldable electrothermal film device comprises a heating element, protecting films and current intercepting bodies, wherein the heating element is a super-flexible graphene film obtained by subjecting large-piece even graphene oxide to solution film formation, chemical reduction, high-temperature reduction, high-pressure pressing and the like.The graphene film is formed by macroscopic multilayer-fold graphene with micro-scale folds through physical crosslinking, every two lamellas of the graphene film can slide relative to each other, and high flexibility is achieved.The graphene lamellas have few defects and are perfect in structure, extremely large in lamella crystalline area (about 100 micrometers) and compact in structure after the high-pressure pressing, and the electrothermal film prepared by the graphene film is super-high in conductivity and thermal conductivity.The super-flexible graphene electrothermal film can be repeatedly bent for more than 1200 times, the elongation at break of the electrothermal film is 12-18%, the conductivity of the electrothermal film is 8000-10600S/cm, and the thermal conductivity of the electrothermal film is 1800-2600W/mK.

Description

technical field [0001] The invention relates to a novel heat conduction device, in particular to a graphene-based foldable electrothermal film device. 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 worldwide wave of research on graphene. 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 metals i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/04H05B3/36
CPCC01B2204/22H05B3/36
Inventor 高超王冉彭蠡孙海燕杨清
Owner ZHEJIANG TANGUSHANGXI MATERIAL SCI & TECH
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