Nano-scaled graphene platelets with a high length-to-width aspect ratio

Patent · Tue Sep 07 00:00:00 EDT 2010

OSTI ID:1017171

Zhamu, Aruna ^[1]; Guo, Jiusheng ^[1]; Jang, Bor Z ^[1]

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1. Centerville, OH

This invention provides a nano-scaled graphene platelet (NGP) having a thickness no greater than 100 nm and a length-to-width ratio no less than 3 (preferably greater than 10). The NGP with a high length-to-width ratio can be prepared by using a method comprising (a) intercalating a carbon fiber or graphite fiber with an intercalate to form an intercalated fiber; (b) exfoliating the intercalated fiber to obtain an exfoliated fiber comprising graphene sheets or flakes; and (c) separating the graphene sheets or flakes to obtain nano-scaled graphene platelets. The invention also provides a nanocomposite material comprising an NGP with a high length-to-width ratio. Such a nanocomposite can become electrically conductive with a small weight fraction of NGPs. Conductive composites are particularly useful for shielding of sensitive electronic equipment against electromagnetic interference (EMI) or radio frequency interference (RFI), and for electrostatic charge dissipation.

• Research Organization: Nanotek Instruments, Inc. (Dayton, OH)
• Sponsoring Organization: USDOE
• Assignee: Nanotek Instruments, Inc. (Dayton, OH)
• Patent Number(s): 7,790,285
• Application Number: 12/002,278
• OSTI ID: 1017171
• Country of Publication: United States
• Language: English