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. 2020 Nov 7;8(7):nwaa274. doi: 10.1093/nsr/nwaa274

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© The Author(s) 2020. 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 (http://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 3. — Calcium near-edge X-ray absorption fine structure spectra (NEXAFS) of the regular calcium metal, the regular CaCl₂ crystal and the CaCl crystals in rGO membranes.