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Electrochemical method of producing nano-scaled graphene platelets

United States Patent

September 3, 2013
View the Complete Patent at the US Patent & Trademark Office
A method of producing nano-scaled graphene platelets with an average thickness smaller than 30 nm from a layered graphite material. The method comprises (a) forming a carboxylic acid-intercalated graphite compound by an electrochemical reaction; (b) exposing the intercalated graphite compound to a thermal shock to produce exfoliated graphite; and (c) subjecting the exfoliated graphite to a mechanical shearing treatment to produce the nano-scaled graphene platelets. Preferred carboxylic acids are formic acid and acetic acid. The exfoliation step in the instant invention does not involve the evolution of undesirable species, such as NO.sub.x and SO.sub.x, which are common by-products of exfoliating conventional sulfuric or nitric acid-intercalated graphite compounds. The nano-scaled platelets are candidate reinforcement fillers for polymer nanocomposites. Nano-scaled graphene platelets are much lower-cost alternatives to carbon nano-tubes or carbon nano-fibers.
Zhamu; Aruna (Centerville, OH), Jang; Joan (Centerville, OH), Jang; Bor Z. (Centerville, OH)
Nanotek Instruments, Inc. (Dayton, OH)
11/ 881,388
July 27, 2007
GOVERNMENT GRANT INFORMATION Based on the research result of a US Department of Energy (DoE) Small Business Innovation Research (SBIR) project. The US government has certain rights on this invention.