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. 2021 Jun 4;7(23):eabf0614. doi: 10.1126/sciadv.abf0614

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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. 1 — (A) Sketch map of the PDLLA-Zn-nitrided Fe BRS with a nanoscale Zn sacrificial layer intercalated between the sirolimus-eluting PDLLA coating and the nitrided Fe platform. (B and C) SEM images of the strut cross section. (D) XPS spectrum and (E) XRD pattern of the sample after nanoscale Zn sacrificial layer deposition. (F) FTIR spectrum of the PDLLA coating. a.u., arbitrary unit.