NDLI: Scalable enhancement of graphene oxide properties by thermally driven phase transformation.

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Scalable enhancement of graphene oxide properties by thermally driven phase transformation.

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Scalable enhancement of graphene oxide properties by thermally driven phase transformation.

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Kumar, Priyank V. Bardhan, Neelkanth M. Tongay, Sefaattin Wu, Junqiao Belcher, Angela M. Grossman, Jeffrey C.
Description	Author Affiliation: Kumar PV ( 1] Department of Materials Science and Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA [2].); Bardhan NM ( 1] Department of Materials Science and Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA [2] The David H. Koch Institute for Integrative Cancer Research, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA [3].); Tongay S ( Department of Materials Science and Engineering, University of California, Berkeley, California 94704, USA.); Wu J ( Department of Materials Science and Engineering, University of California, Berkeley, California 94704, USA.); Belcher AM ( 1] Department of Materials Science and Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA [2] The David H. Koch Institute for Integrative Cancer Research, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA [3] Department of Biological Engi); Grossman JC ( Department of Materials Science and Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA.)
Abstract	Chemical functionalization of graphene is promising for a variety of next-generation technologies. Although graphene oxide (GO) is a versatile material in this direction, its use is limited by the production of metastable, chemically inhomogeneous and spatially disordered GO structures under current synthetic protocols, which results in poor optoelectronic properties. Here, we present a mild thermal annealing procedure, with no chemical treatments involved, to manipulate as-synthesized GO on a large scale to enhance sheet properties with the oxygen content preserved. Using experiments supported by atomistic calculations, we demonstrate that GO structures undergo a phase transformation into prominent oxidized and graphitic domains by temperature-driven oxygen diffusion. Consequently, as-synthesized GO that absorbs mainly in the ultraviolet region becomes strongly absorbing in the visible region, photoluminescence is blue shifted and electronic conductivity increases by up to four orders of magnitude. Our thermal processing method offers a suitable way to tune and enhance the properties of GO, which creates opportunities for various applications.
File Format	HTM / HTML
ISSN	17554330
Issue Number	2
Volume Number	6
e-ISSN	17554349
Journal	Nature Chemistry
Language	English
Publisher	Nature Publishing Group
Publisher Date	2014-02-01
Publisher Place	Great Britain (UK)
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Discipline Chemistry Graphite Chemistry Oxides Diffusion Electric Conductivity Electronics Oxidation-reduction Oxygen Phase Transition Spectroscopy, Fourier Transform Infrared Temperature Journal Article Research Support, U.s. Gov't, Non-p.h.s.
Content Type	Text
Resource Type	Article
Subject	Chemistry Chemical Engineering

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