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. 2020 Sep 4;6(36):eabb4696. doi: 10.1126/sciadv.abb4696

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Copyright © 2020 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. 1 — (A) Schematic illustration of the TEMPO-doped PDA with narrower bandgap and improved light absorption ability compared to conventional PDA. (B) Polymerization of dopamine and TEMPO, together with their molecular structures and powder photographs. (C) SEM image of PDA-3. (D) EELS mapping analysis of PDA-3 (Scale bars, 100 nm). (E) XPS survey spectra of PDA-i (i = 0 to 3). a.u., arbitrary units. (F) C 1s peaks, (G) N 1s peaks, and (H) O 1s peaks in XPS spectra of PDA-3.