Chemical structures of hydrazine-treated graphene oxide and generation of aromatic nitrogen doping

Sungjin Park (), Yichen Hu, Jin Ok Hwang, Eui-Sup Lee, Leah B. Casabianca, Weiwei Cai, Jeffrey R. Potts, Hyung-Wook Ha, Shanshan Chen, Junghoon Oh, Sang Ouk Kim, Yong-Hyun Kim, Yoshitaka Ishii and Rodney S. Ruoff
Additional contact information
Sungjin Park: Inha University
Yichen Hu: University of Illinois at Chicago
Jin Ok Hwang: KAIST, Daejeon 305-701, Korea.
Eui-Sup Lee: Graduate School of Nanoscience and Technology (WCU) and KAIST Institute for the NanoCentury, KAIST
Leah B. Casabianca: University of Illinois at Chicago
Weiwei Cai: University of Texas at Austin, One University Station C2200
Jeffrey R. Potts: University of Texas at Austin, One University Station C2200
Hyung-Wook Ha: University of Texas at Austin, One University Station C2200
Shanshan Chen: University of Texas at Austin, One University Station C2200
Junghoon Oh: Inha University
Sang Ouk Kim: KAIST, Daejeon 305-701, Korea.
Yong-Hyun Kim: Graduate School of Nanoscience and Technology (WCU) and KAIST Institute for the NanoCentury, KAIST
Yoshitaka Ishii: University of Illinois at Chicago
Rodney S. Ruoff: University of Texas at Austin, One University Station C2200

Nature Communications, 2012, vol. 3, issue 1, 1-8

Abstract: 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 13C and 15N solid-state nuclear magnetic resonance spectroscopy and X-ray photoelectron spectroscopy to study the chemical structure of 15N-labelled hydrazine-treated 13C-labelled graphite oxide and unlabelled hydrazine-treated graphene oxide, respectively. These experiments suggest that hydrazine treatment of graphene oxide causes insertion of an aromatic N2 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 N2 structures at the edges and help to elucidate the influence of the aromatic N2 moieties on the electronic structure of chemically modified graphene platelets.

Date: 2012
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DOI: 10.1038/ncomms1643

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