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. 2021 Dec 10;7(50):eabj7857. doi: 10.1126/sciadv.abj7857

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Copyright © 2021 The Authors, some rights reserved; exclusive licensee American Association for the Advancement of Science. No claim to original U.S. Government Works. Distributed under a Creative Commons Attribution NonCommercial License 4.0 (CC BY-NC).

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Fig. 2. — (A) Scheme of the preparation of NBG and CAG. APTMS, (3-aminopropyl) trimethoxysilane. (B) High-resolution x-ray photoelectron spectroscopy spectra of N1s in NBG particles. a.u., arbitrary units. (C) Zeta potential of AG, BG, and NBG. (D) Fourier transform infrared spectra of AG, BAG, and CAG. (E) X-ray diffractometer patterns of AG, BAG, and CAG. (F) Scanning electron microscopy (SEM) image of BG. (G) SEM image of synthesized NBG.