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Rapid synthesis of thin amorphous carbon films by sugar dehydration and dispersion

Chemistry Division, U. S. Naval Research Laboratory, Washington D. C., 20375, United States

Topical Section: 2D Materials

We have prepared amorphous carbon films with variable thicknesses down to <5 nm using a simple procedure which takes minutes and employs no special equipment. We prepare a carbonaceous suspension by the dehydration reaction of sulfuric acid with glucose and show that adding this mixture dropwise into water creates a thin carbon film on the water’s surface which can be transferred to an arbitrary substrate. This transparent brown film is non-conductive and has a chemical makeup, excluding hydrogen, of CS0.0213O0.4563. After brief annealing under 10% H2 in argon at 800 °C, the film has a high optical contrast and increased conductivity, with a chemical makeup of CO0.0828, suggesting that the material has at least short-range graphitic order. We repeat the experiment with chitosan replacing glucose and show using Raman spectroscopy and X-ray photoelectron spectroscopy (XPS) that it is likely that nitrogen incorporates into the graphitic lattice.
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Copyright Info: © 2016, Keith E. Whitener Jr, licensee AIMS Press. This is an open access article distributed under the terms of the Creative Commons Attribution Licese (http://creativecommons.org/licenses/by/4.0)

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