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. 2021 Aug 14;9(7):nwab147. doi: 10.1093/nsr/nwab147

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© The Author(s) 2021. 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 2. — Characterization of PCG prepared via aqueous exfoliation. (a) Scheme of the ultrasound-assisted mechanical exfoliation of graphite in the presence of self-assembling Py-GAGAGY peptides. (b) AFM topographic image (top) and height profile (bottom) of the self-assembled peptide fibers on an exfoliated graphene surface. (c) TEM image (top), electron diffraction pattern (middle) and diffracted intensity (bottom) taken along the 110 to 210 axis of the graphene after removing the peptide using dialysis. (d) C 1s XPS spectrum of the graphene. The peak areas of C=C, C−OH and C=O are 9436, 918 and 606 a.u., respectively. The low oxygen content indicates the high quality of the produced graphene. (e) Representative Raman spectroscopy of PCG and graphite (excited at 532 nm). (f) Distributions of D/D’ and width of PCG based on Raman spectroscopy. Low D/D’ ratios indicate that the produced graphene only contains a few edge defects and no vacancy or sp³ defects.

Inline graphic — Characterization of PCG prepared via aqueous exfoliation. (a) Scheme of the ultrasound-assisted mechanical exfoliation of graphite in the presence of self-assembling Py-GAGAGY peptides. (b) AFM topographic image (top) and height profile (bottom) of the self-assembled peptide fibers on an exfoliated graphene surface. (c) TEM image (top), electron diffraction pattern (middle) and diffracted intensity (bottom) taken along the 110 to 210 axis of the graphene after removing the peptide using dialysis. (d) C 1s XPS spectrum of the graphene. The peak areas of C=C, C−OH and C=O are 9436, 918 and 606 a.u., respectively. The low oxygen content indicates the high quality of the produced graphene. (e) Representative Raman spectroscopy of PCG and graphite (excited at 532 nm). (f) Distributions of D/D’ and width of PCG based on Raman spectroscopy. Low D/D’ ratios indicate that the produced graphene only contains a few edge defects and no vacancy or sp³ defects.