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1. (US20160225538) Covalently-grafted polyaniline on graphene oxide sheets and its application in electrochemical supercapacitors
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Claims

1. A method for synthesizing a graphene-polyaniline hybrid composite, comprising:
a) functionalizing the surface of a graphene substrate with aniline groups; and
b) polymerizing the aniline groups to yield a graphene-polyaniline hybrid material;
wherein the graphene-polyaniline hybrid composite has a specific surface area of 127 m 2/g, a pore volume of 0.56 cm 3/g, and an average pore size of 37.5 nm,
wherein during a), a thin film of aniline is formed on the graphene body; and
wherein during b), a plurality of vertically aligned polyaniline rods are formed.
2. The method of claim 1 and further comprising:
c) before a), oxidatively exfoliating natural graphite flakes to yield a graphene body;
wherein during a), the surface of the graphene body is functionalized with aniline groups via a diazonium reaction; and
wherein during b), covalently-grafted polyaniline-graphene composites are formed by in-situ polymerization of aniline in the presence of aniline-functionalized graphene oxide, an oxidant, and an acid dopant.
3. The method of claim 2 wherein the covalently-grafted polyaniline-graphene composites have aniline-to-graphene oxide weight ratios between about 1:1 and about 10:1.
4. A method for synthesizing a graphene-polyaniline hybrid composite, comprising:
a) oxidatively exfoliating natural graphite flakes to yield a graphene substrate;
b) functionalizing the surface of the graphene substrate with aniline groups;
c) polymerizing the aniline groups to yield a graphene oxide-polyaniline hybrid material; and
d) forming a plurality of vertically aligned polyaniline nanorods extending from the graphene oxide-polyaniline hybrid material;
wherein the graphene oxide-polyaniline hybrid composite has a specific surface area of at least about 127 m 2/g, a pore volume of at least about 0.56 cm 3/g, and an average pore size of about 37.5 nm;
wherein during c), covalently-grafted polyaniline-graphene composites are formed by in-situ polymerization of aniline in the presence of aniline-functionalized graphene oxide, an oxidant, and an acid dopant.
5. The method of claim 4 wherein the plurality of nanorods is uniformly distributed about the graphene oxide-polyaniline hybrid composite.