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Graphene nano-sheets and methods for making the same

A graphene nanosheet and graphene technology, applied in graphene, nanocarbon, nanotechnology, etc., can solve problems such as defects

Inactive Publication Date: 2013-06-05
XEROX CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, oxidizing agents and toxic reducing agents must be used in the Hummer method, which creates defects in the final graphene sheet

Method used

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  • Graphene nano-sheets and methods for making the same
  • Graphene nano-sheets and methods for making the same
  • Graphene nano-sheets and methods for making the same

Examples

Experimental program
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Effect test

Embodiment 1

[0050] Thermally expandable graphite flakes were purchased from Asbury Carbon Inc. (Asbury, NJ). The graphite flakes were added to a tungsten vacuum evaporation boat, which was then placed in a vacuum chamber (Edwards Auto 306 evaporation system). The vacuum chamber was then evacuated to a pressure of approximately 2X10 -6 millibar. The boat was then heated using about 70% power (220V, 7Am input) for about 1 minute. The temperature reaches about 850°C. Graphite visibly expands into a black, distorted solid, forming exfoliated graphite.

Embodiment 2

[0052] Add a small amount of expanded graphite prepared in Example 1 into dichlorobenzene solvent, use a bath sonicator to sonicate for a few minutes, and then perform probe sonication (probe sonication) (about 50% power) for about 3 minutes to better Individual graphene layers exfoliate and separate. After the bath and probe sonication steps, the mixture was centrifuged at about 3500 rpm for about 10 minutes to remove large particles that did not exfoliate well. After centrifugation, a stable graphene dispersion comprising graphene nanosheets was obtained, indicated by a black or gray color of the solution. The concentration of graphene nanosheets in the solution was calculated from the UV-Vis absorption spectrum at a wavelength of about 660 nm, using the Lambert-Beer law and the extinction coefficient. UV-Vis spectroscopy (performed using a Casey UV-Vis-NIR spectrophotometer) indicated that the concentration of graphene nanosheets produced was up to about 0.017 mg / ml.

[0...

Embodiment 3

[0055] Exfoliated expanded graphite in a solvent containing one or more stabilizers. In this example, expanded graphite was added to a 0.03% by weight solution of poly(3,3"'-didodecylquatrathiophene) (PQT) in 1,2-dichlorobenzene as a solvent. The expanded Graphite has a PQT loading of about 50% by weight. After sonication and centrifugation, essentially no precipitation is observed. That is, the exfoliated graphite is exfoliated and stabilized in the graphene dispersion. The graphene will subsequently be included Graphene dispersions of nanosheets and PQTs were spin-casted (spin-cast) to form graphene-PQT composite films on silicon wafers. SEM images showed that the graphene-PQT composites contained particles dispersed in PQT aggregates Graphene nanosheets in substrates.

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Abstract

Various embodiments provide materials and methods for forming a graphene product by vacuum induction heating expandable graphite. The graphene product can include graphene nano-sheets with high purity and uniform thickness. The graphene nano-sheets can contain carbon of more than about 99% by weight. The graphene nano-sheets can be exfoliated or dispersed within a matrix of a semiconducting polymer to form a graphene-containing composite.

Description

technical field [0001] The invention relates to a method for preparing expanded graphite, a method for preparing graphene products and graphene nano sheets. Background technique [0002] In recent years, graphene has attracted considerable interest due to its excellent electronic, thermal, and mechanical properties. Potential applications of graphene include transparent electrodes and semiconductors, nanocomposites, batteries, supercapacitors, hydrogen storage, etc. [0003] Conventional methods for producing graphene sheets include the bottom-up method, which forms sp between carbon atoms in monoatomic layers. 2 -Bond. Chemical vapor deposition (CVD) and epitaxial growth from silicon carbide are used for the bottom-up approach. Another conventional method for producing graphene sheets involves the top-down method, which is carried out by chemical oxidation and reduction to exfoliate graphite. The top-down method is also known as the Hummer method. However, oxidizing ag...

Claims

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Application Information

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IPC IPC(8): C01B31/04C08L65/00C08K7/24C08K3/04
CPCC08K7/24C08G2261/3223C08L65/00C01B31/04C01B31/0469C08K3/04B82Y30/00B82Y40/00C01B32/19C08K3/042
Inventor 吴贻良S·J·加德纳
Owner XEROX CORP
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