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. 2022 Apr 4;10:862495. doi: 10.3389/fbioe.2022.862495

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Copyright © 2022 Yoo, Lee, Kim, Jeong, Park, Ahn, Jung, Lee, Kim, Lee, Cho and Kim.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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(A) HR-TEM image, (B) XRD patterns, and (C) UV-Raman spectra of the highly purified DND prepared by using HClO₄. The UV-Raman laser is 325 nm and the intensity ratio was calculated based on I _Dia /I _G = 1325 cm⁻¹/1590 cm⁻¹.