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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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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The process enables the production of NGPs in large quantities at lower costs, with electronic, thermal, and mechanical properties comparable to carbon nanotubes, making them suitable for various engineering applications.

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

Experimental program
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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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