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Evidence of nanocrystalline semiconducting graphene monoxide during thermal reduction of graphene oxide in vacuum

by Eric C. Mattson, Haihui Pu, Shumao Cui, Marvin A. Schofield, Sonny Rhim, Ganhua Lu, Michael J. Nasse, Rodney S. Ruoff, Michael Weinert, Marija Gajdardziska-Josifovska, Junhong Chen, Carol J. Hirschmugl show all authors
ACS Nano ()

Abstract

As silicon-based electronics are reaching the nanosize limits of the semiconductor roadmap, carbon-based nanoelectronics has become a rapidly growing field, with great interest in tuning the properties of carbon-based materials. Chemical functionalization is a proposed route, but syntheses of graphene oxide (G-O) produce disordered, nonstoichiometric materials with poor electronic properties. We report synthesis of an ordered, stoichiometric, solid-state carbon oxide that has never been observed in nature and coexists with graphene. Formation of this material, graphene monoxide (GMO), is achieved by annealing multilayered G-O. Our results indicate that the resulting thermally reduced G-O (TRG-O) consists of a two-dimensional nanocrystalline phase segregation: unoxidized graphitic regions are separated from highly oxidized regions of GMO. GMO has a quasi-hexagonal unit cell, an unusually high 1:1 O:C ratio, and a calculated direct band gap of ∼0.9 eV.

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