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. 2024 Jun 17;11(12):nwae211. doi: 10.1093/nsr/nwae211

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© The Author(s) 2024. Published by Oxford University Press on behalf of China Science Publishing & Media Ltd.

This is an Open Access article distributed under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0/), which permits unrestricted reuse, distribution, and reproduction in any medium, provided the original work is properly cited.

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Figure 1. — Structural and compositional characterization of few-layer graphene in the CE-5 lunar soil sample. (a) Laser scanning confocal microscopy image and height distribution. (b) Backscattered electron SEM image and (c) Raman spectra corresponding to different areas. (d) Representative low-magnification bright-field transmission electron microscopy (TEM) image, Cs-corrected high-angle annular dark-field (HAADF)-STEM image and the corresponding electron energy loss spectroscopy (EELS) Fe L-edge spectra for different areas. (e1–e3) Cs-corrected high-resolution TEM (HRTEM) images. (f) HAADF-STEM image of a core–shell structure with an abundance of few-layer graphene (upper left inset: bright-field TEM image of corresponding area), (g) EDS elemental maps showing spatial distributions of the elements and (h) Cs-corrected HRTEM images of (h1–h4) in the corresponding areas marked in (f). Both layer number and average interplanar spacing of few-layer graphene are labeled.