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. 2024 Jun 15;14(6):308. doi: 10.3390/bios14060308

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© 2024 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).

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The FESEM images of (a) Fe₃O₄ nanoparticles (FO), (b) Fe₃O₄ particles embedded in PDA (FO-PDA) and (c) Fe₃O₄-PDA nanoparticles functionalized with folic acid (FO-PDA-FA). (d) XRD spectra and (e) FTIR spectra of FO, FO-PDA and FO-PDA-FA.