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. 2020 Oct 22;10:18047. doi: 10.1038/s41598-020-74821-3

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© The Author(s) 2020

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/.

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(a) Vial containing hexadecane (top), water (bottom), and graphite. Although denser than water, the graphitic material is pinned at the oil/water interface; (b) illustration of graphite initially at the oil/water interface; (c) overlapping graphene sheets at the solvent interface after the spontaneous spreading (exfoliation) of the graphite; (d) conductive ink consisting of graphene stabilized water-in-oil emulsion; (e) optical microscopy image of the ink showing graphene stabilized water droplets; (f) illustration of water-in-oil emulsion with graphene stabilizing the interface; (g) TEM image of graphene prepared by interfacial trapping showing overlapped exfoliated sheets; (h) magnified image showing the moiré pattern on graphene formed by re-stacked exfoliated graphene sheets; (i) UCONN (University of Connecticut) logo printed on paper using graphene emulsion ink; (j) A cross-section of graphene emulsion ink printed on paper.