Flexible graphene composite film and preparation method thereof

A flexible graphite and composite thin film technology, applied in chemical instruments and methods, carbon compounds, inorganic chemistry, etc., can solve the problems that limit the smooth transport of electrons and holes in graphene, the difficulty of graphene electrodes to be used alone, and the difficulty in large-scale production, etc. problems, to achieve the effect of easy control of experimental conditions, good uniformity of surface structure and low cost

Active Publication Date: 2013-04-03
SHANGHAI JIAO TONG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, since the work function of graphene itself is between 4.3 and 4.6, there is often a large energy level width between the hole and electron transport layer, which limits the smooth transmission of graphene electrons and holes, making graphene difficult. Used alone as an electrode
At present, the more commonly used modification methods are surface treatment of substrates [Joohyun Hwang, Hong Kyw Choi, et al. APPLIED PHYSICS LETTERS100, 133304 (2012)], doping of hole or electron transport layers [Tae-Hee Han, Youngbin Lee, et al.NATURE PHOTONICS6,105-110(2012)], etc., these methods can achieve good results, but their processing methods are relatively complicated and difficult to meet the needs of large-scale production

Method used

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  • Flexible graphene composite film and preparation method thereof
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  • Flexible graphene composite film and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Preparation of graphene / small molecule composite films with electron-withdrawing groups

[0040] 1) The PET substrate is ultrasonically cleaned 4-5 times in advance with deionized water, acetone and isopropanol to remove oil and impurities on the surface, and then the surface is treated with oxygen plasma to improve the adhesion of the substrate.

[0041] 2) After treating the 1mg / mL graphene oxide solution with a small amount of isocyanate, add 0.1mg / mL SOCl 2 The solution was stirred for 24h in a nitrogen atmosphere, and the reaction process was as follows figure 1 shown.

[0042] 3) Spin-coat the obtained mixed solution on the surface of the PET substrate to form a uniform film, control the speed at 3000 rpm, rotate for 15 seconds, dry in a vacuum oven, and repeat the above steps 5-6 times.

[0043] 4) Immerse the obtained substrate in a hydrazine hydrate solution for full reduction, then take out the substrate, heat it to 100-150°C at a rate of 10°C / min under a ni...

Embodiment 2

[0046] Preparation of graphene / polymer composite films with electron-withdrawing groups

[0047] 1) The PET film substrate is ultrasonically cleaned 4-5 times in advance with deionized water, acetone and isopropanol to remove oil and impurities on the surface, and then treated with oxygen plasma to improve the adhesion of the substrate.

[0048] 2) Fully reduce 1 mg / mL graphene with hydrazine hydrate at a volume ratio of 100:1, vacuum filter the obtained graphene reduction solution, wash it repeatedly with deionized water and acetone for 5-10 times, and then put it in a vacuum oven Fully dry at 100°C for 5 hours to obtain reduced graphene powder; dissolve the reduced graphene powder in DMF solution for ultrasonic treatment, after the solution is treated with a small amount of isocyanate, add a small amount of epoxy acrylic resin, and stir under nitrogen atmosphere More than 36 hours.

[0049] 3) Immerse the substrate in the above mixture, pull it out after 5 seconds at a pull...

Embodiment 3

[0053] Preparation of Graphene / Small Molecule Composite Films with Electron Donating Groups

[0054] 1) The PET film substrate is ultrasonically cleaned 4-5 times in advance with deionized water, acetone and isopropanol to remove oil and impurities on the surface, and then treated with oxygen plasma to improve the adhesion of the substrate.

[0055] 2) After the 1 mg / mL graphene oxide solution was treated with a small amount of isocyanate, it was passivated with 70% nitric acid, and then 0.1 mg / mL isopropanol aqueous solution was added and stirred in a nitrogen atmosphere for 48 h.

[0056] 3) Spin-coat the obtained mixed solution on the surface of the PET substrate to form a uniform film, control the speed at 3000 rpm, rotate for 15 seconds, dry in a vacuum oven, and repeat the above steps 5-6 times.

[0057] 4) Immerse the obtained substrate in the ethylenediamine solution for 1 hour, then take out the substrate, and heat it to 100-300° C. at a speed of 10° C. / min under a ni...

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Abstract

The invention discloses a flexible graphene composite film and a preparation method thereof. The preparation method comprises the following steps of: based on oxidized or reduced graphene and organic polymer or micromolecule with a special functional group as raw materials, forming a uniform composite material by utilizing the interaction of a surface functional group of graphene and an organic molecule group, and preparing the graphene composite film on the surfaces of different substrates through methods of spin coating, spraying and the like. According to the preparation method disclosed by the invention, by utilizing an electron withdrawing group, an electron-donating group or a conjugate group in the organic polymer or micromolecule, the hole or electron concentration on the surface of a graphene electrode is increased, the work function of the electrode is controlled, the conductivity of the graphene electrode is improved, and the application range of a device is widened. According to the flexible graphene composite film disclosed by the invention, because the interaction among the groups is utilized, the compatibility of the prepared composite film is better, the structure is uniform, and the flexible graphene composite film is suitable for the photoelectric field of solar batteries, sensors, organic light-emitting diodes, touch screens and the like.

Description

technical field [0001] The invention relates to a flexible graphene composite film and a preparation method thereof, belonging to the field of preparation of composite films, in particular to the field of photoelectric devices using graphene as an electrode. Background technique [0002] Since its discovery, graphene has caused revolutionary changes in many research fields due to its excellent optical, electrical, mechanical and thermodynamic properties, among which the research on optoelectronic devices is the most significant. At present, common optoelectronic devices such as solar cells, sensors, and organic light-emitting diodes (OLEDs) mostly use indium tin oxide (ITO) as the electrode material. However, due to the limitation of indium reserves on the earth, the price and prospect of indium are not optimistic. Moreover, the ITO film itself is brittle and easily corroded by acid, so choosing a suitable electrode replacement material has become a research hotspot for scie...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/04C01B32/194
CPCY02P20/133
Inventor 吴欣凯何谷峰王经刘俊黄赛君石鑫栋
Owner SHANGHAI JIAO TONG UNIV
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