Monolithic graphene oxide sheets with controllable composition

Jae Hwan Chu, Jinsung Kwak, Sung-Dae Kim, Mi Jin Lee, Jong Jin Kim, Soon-Dong Park, Jae-Kyung Choi, Gyeong Hee Ryu, Kibog Park, Sung Youb Kim, Ji Hyun Kim, Zonghoon Lee, Young-Woon Kim and Soon-Yong Kwon ()
Additional contact information
Jae Hwan Chu: School of Materials Science and Engineering, Ulsan National Institute of Science and Technology (UNIST)
Jinsung Kwak: School of Materials Science and Engineering, Ulsan National Institute of Science and Technology (UNIST)
Sung-Dae Kim: Seoul National University
Mi Jin Lee: School of Materials Science and Engineering, Ulsan National Institute of Science and Technology (UNIST)
Jong Jin Kim: School of Mechanical and Nuclear Engineering, Ulsan National Institute of Science and Technology (UNIST)
Soon-Dong Park: School of Mechanical and Nuclear Engineering, Ulsan National Institute of Science and Technology (UNIST)
Jae-Kyung Choi: School of Materials Science and Engineering, Ulsan National Institute of Science and Technology (UNIST)
Gyeong Hee Ryu: School of Materials Science and Engineering, Ulsan National Institute of Science and Technology (UNIST)
Kibog Park: School of Electrical and Computer Engineering, Ulsan National Institute of Science and Technology (UNIST)
Sung Youb Kim: School of Mechanical and Nuclear Engineering, Ulsan National Institute of Science and Technology (UNIST)
Ji Hyun Kim: School of Mechanical and Nuclear Engineering, Ulsan National Institute of Science and Technology (UNIST)
Zonghoon Lee: School of Materials Science and Engineering, Ulsan National Institute of Science and Technology (UNIST)
Young-Woon Kim: Seoul National University
Soon-Yong Kwon: School of Materials Science and Engineering, Ulsan National Institute of Science and Technology (UNIST)

Nature Communications, 2014, vol. 5, issue 1, 1-10

Abstract: Abstract Graphene oxide potentially has multiple applications and is typically prepared by solution-based chemical means. To date, the synthesis of a monolithic form of graphene oxide that is crucial to the precision assembly of graphene-based devices has not been achieved. Here we report the physical approach to produce monolithic graphene oxide sheets on copper foil using solid carbon, with tunable oxygen-to-carbon composition. Experimental and theoretical studies show that the copper foil provides an effective pathway for carbon diffusion, trapping the oxygen species dissolved in copper and enabling the formation of monolithic graphene oxide sheets. Unlike chemically derived graphene oxide, the as-synthesized graphene oxide sheets are electrically active, and the oxygen-to-carbon composition can be tuned during the synthesis process. As a result, the resulting graphene oxide sheets exhibit tunable bandgap energy and electronic properties. Our solution-free, physical approach may provide a path to a new class of monolithic, two-dimensional chemically modified carbon sheets.

Date: 2014
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DOI: 10.1038/ncomms4383

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