Fig. 1 XRD and sp2/sp3 component of compressed GCs (Com

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Fig. 1 XRD and sp2/sp3 component of compressed GCs (Com Fig. 1 XRD and sp2/sp3 component of compressed GCs (Com.GCs) measured at ambient conditions. XRD and sp2/sp3 component of compressed GCs (Com.GCs) measured at ambient conditions. The Com.GC numbers (1 to 4) and Diamond + Com.GC represent the samples recovered after compressing GCs at 25 GPa and temperatures of 400°, 600°, 800°, 1000°, and 1200°C, respectively. (A) The graphite-like interlayer distances for compressed GCs gradually reduced with the increase of synthesis temperatures. The S(q) data are unscaled but successively shifted from the raw GC data by 0.6 units in the vertical axis. The insets show Franklin’s model of nongraphitizing carbon (11), ordered graphite structure with standard interlayer distance of 3.35 Å, and the bulk morphology of recovered sample rods. (B) EELS change showing the decreased sp2 component in the compressed GCs relative to the raw material. The pink and light blue regions represent 1s-π* and 1s-σ* transitions of carbon, respectively. Meng Hu et al. Sci Adv 2017;3:e1603213 Copyright © 2017, The Authors