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. 2017 Jun 30;7:4452. doi: 10.1038/s41598-017-04073-1

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© The Author(s) 2017

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 license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license 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 license, visit http://creativecommons.org/licenses/by/4.0/.

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(A) Transmission electron microscopy (TEM) image of egg yolk oil carbon quantum dots (EYO CDs). (magnification 145,000x), the accelerating voltage was 100 kV. (B) Histograms of particle size distribution of EYO CDs. (magnification 880,000x), the accelerating voltage was 200 kV. (C and D) High-resolution TEM (HRTEM) images of individual EYO CDs. (E) The line profiles of the corresponding HRTEM images of EYO CDs. The lattice fringe (d = 0.267 nm) induced from the inplane diffraction of graphene.