title: Chemical structures of hydrazine-treated graphene oxide and generation of aromatic nitrogen doping.
abstract: Chemically modified graphene platelets, produced via graphene oxide, show great promise in a variety of applications due to their electrical, thermal, barrier and mechanical properties. Understanding the chemical structures of chemically modified graphene platelets will aid in the understanding of their physical properties and facilitate development of chemically modified graphene platelet chemistry. Here we use (13)C and (15)N solid-state nuclear magnetic resonance spectroscopy and X-ray photoelectron spectroscopy to study the chemical structure of (15)N-labelled hydrazine-treated (13)C-labelled graphite oxide and unlabelled hydrazine-treated graphene oxide, respectively. These experiments suggest that hydrazine treatment of graphene oxide causes insertion of an aromatic N(2) moiety in a five-membered ring at the platelet edges and also restores graphitic networks on the basal planes. Furthermore, density-functional theory calculations support the formation of such N(2) structures at the edges and help to elucidate the influence of the aromatic N(2) moieties on the electronic structure of chemically modified graphene platelets.
authors.affiliation: Department of Chemistry, Inha University, Incheon 402-751, Korea. sungjinpark@inha.ac.kr
authors.forename: Sungjin
authors.initials: S
authors.lastname: Park
authors.forename: Yichen
authors.initials: Y
authors.lastname: Hu
authors.forename: Jin Ok
authors.initials: JO
authors.lastname: Hwang
authors.forename: Eui-Sup
authors.initials: ES
authors.lastname: Lee
authors.forename: Leah B
authors.initials: LB
authors.lastname: Casabianca
authors.forename: Weiwei
authors.initials: W
authors.lastname: Cai
authors.forename: Jeffrey R
authors.initials: JR
authors.lastname: Potts
authors.forename: Hyung-Wook
authors.initials: HW
authors.lastname: Ha
authors.forename: Shanshan
authors.initials: S
authors.lastname: Chen
authors.forename: Junghoon
authors.initials: J
authors.lastname: Oh
authors.forename: Sang Ouk
authors.initials: SO
authors.lastname: Kim
authors.forename: Yong-Hyun
authors.initials: YH
authors.lastname: Kim
authors.forename: Yoshitaka
authors.initials: Y
authors.lastname: Ishii
authors.forename: Rodney S
authors.initials: RS
authors.lastname: Ruoff
mesh_terms: D002247:Carbon Isotopes / Q000737:chemistry; D002621:Chemistry / Q000379:methods; D006108:Graphite / Q000737:chemistry*; D006358:Hot Temperature; D006834:Hydrazines / Q000737:chemistry*; D009682:Magnetic Resonance Spectroscopy / Q000379:methods; D008956:Models, Chemical; D009584:Nitrogen / Q000737:chemistry*; D010087:Oxides / Q000737:chemistry*; D056951:Photoelectron Spectroscopy / Q000379:methods; D014867:Water / Q000737:chemistry
chemical_list: D002247:Carbon Isotopes; D006834:Hydrazines; D010087:Oxides; D014867:Water; C029424:hydrazine; D006108:Graphite; D009584:Nitrogen