Process for nano-scaled graphene plates

a graphene plate and nano-scale technology, applied in the direction of nano-carbon, material nanotechnology, carbon compounds, etc., can solve the problems of increasing cost, complicated, slow and expensive purification process, and only about 15% yield of pure carbon nanotubes with respect to the end product, so as to reduce cost, wide property range, and process ease

Inactive Publication Date: 2006-09-28
JANG BOR Z
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  • Application Information

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Problems solved by technology

This technique still remains to be the most commonly used technique for producing carbon nanotubes; however, yield of pure carbon nanotubes with respect to the end product is only about 15%.
Thus, a complicated, slow and expensive purification process must be carried out for particular device applications.
In this case, the carbon nanotubes are produced from graphite at about 1,200° C. or more and from silicon carbide at about 1,600 to 1,700° C. However, this method also requires multiple stages of purification which increases the cost.
In addition, this method has difficulties in large-device applications.
For example, a methane (CH4) gas cannot be used to produce carbon nanotubes by this technique.
In summary, carbon nano-tubes are extremely expensive due to the low yield and low production and purification rates commonly associated with all of the current carbon nano-tube preparation processes.
The high material costs have significantly hindered the widespread application of nano-tubes.

Method used

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  • Process for nano-scaled graphene plates

Examples

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Effect test

example 1

[0038] One hundred grams of polymeric carbon, prepared by oxidation of PAN fibers at 250° C. and partial carbonization of the oxidized PAN at 500° C., were treated in a mixture of sulfuric and nitric acids at concentrations to yield the desired intercalation compound. The product was water washed and dried to approximately 1% by weight water. The dried fibers were introduced into a furnace at 1,250° C. to effect extremely rapid and high expansions of nano-scaled graphite crystallites. The exfoliated carbon sample, chopped into a short fiber form (<1 mm length), was then ball-milled in a high-energy plenary ball mill machine for 24 hours to produce nano-scaled particles.

example 2

[0039] Same as in Example 1, but the carbonization temperature was 1,000° C.

example 3

[0040] A phenol formaldehyde resin was heat treated in an inert atmosphere at a HTT in the range of 350-900° C. to obtain polymeric carbon, which was ground to mm-sized particles and then subjected to solution treatments to obtain exfoliated polymeric carbons. Samples containing exfoliated graphite crystallites were then ball-milled to become nanometer-sized powder.

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Abstract

A process for producing a nano-scaled graphene plate. The material comprises a sheet of graphite plane or a multiplicity of sheets of graphite plane. The graphite plane is composed of a two-dimensional hexagonal lattice of carbon atoms and the plate has a length and a width parallel to the graphite plane and a thickness orthogonal to the graphite plane with at least one of the length, width, and thickness values being 100 nanometers or smaller. The process for producing nano-scaled graphene plate material comprises the steps of: a). partially or fully carbonizing a precursor polymer or heat-treating petroleum or coal tar pitch to produce a polymeric carbon containing micron- and / or nanometer-scaled graphite crystallites with each crystallite comprising one sheet or a multiplicity of sheets of graphite plane; b). exfoliating the graphite crystallites in the polymeric carbon; and c). subjecting the polymeric carbon containing exfoliated graphite crystallites to a mechanical attrition treatment to produce the nano-scaled graphene plate material.

Description

[0001] This is a divisional application from a prior application Ser. No. 10 / 274,473 (filing date Oct. 21, 2002).FIELD OF THE INVENTION [0002] The present invention relates to a nano-scaled thin-plate carbon material, hereinafter referred to as nano-scaled graphene plate (NGP), and a process for producing the NGP material. BACKGROUND [0003] Carbon is known to have four unique crystalline structures, including diamond, graphite, fullerene and carbon nano-tubes. The carbon nano-tube refers to a tubular structure grown with a single wall or multi-wall, which can be conceptually obtained by rolling up a graphite sheet (a sheet of graphene plane or basal plane) or several graphite sheets to form a concentric hollow structure. A graphene plane is characterized by having a network of carbon atoms occupying a two-dimensional hexagonal lattice. Carbon nano-tubes have a diameter on the order of a few nanometers to a few hundred nanometers. [0004] Carbon nano-tubes can function as either a con...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C01B31/02
CPCB82Y30/00B82Y40/00C01B31/0206C01B31/04Y10S977/778C01B31/0423Y10S977/755Y10S977/773Y10S977/783C01B31/0415C01B32/15C01B32/22C01B32/225
Inventor JANG, BOR Z.
Owner JANG BOR Z
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