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. 2022 Dec 6;12(23):4330. doi: 10.3390/nano12234330

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© 2022 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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TEM images of the HNT/Fe₃O₄ and magnetite samples. HNT/Fe₃O₄-C at magnifications of (a) 150 kX and (b) 50 kX: Fe₃O₄-C (c) at 150 kX; HNT/Fe₃O₄-H at (d) 100 kX and (e) 200 kX; Fe₃O₄-H (f) at 200 kX; HNT/Fe₃O₄-SG at (g) 50 kX and (h) 200 kX; Fe₃O₄-SG (i) at 150 kX.

TEM images of the HNT/Fe₃O₄ and magnetite samples. HNT/Fe₃O₄-C at magnifications of (a) 150 kX and (b) 50 kX: Fe₃O₄-C (c) at 150 kX; HNT/Fe₃O₄-H at (d) 100 kX and (e) 200 kX; Fe₃O₄-H (f) at 200 kX; HNT/Fe₃O₄-SG at (g) 50 kX and (h) 200 kX; Fe₃O₄-SG (i) at 150 kX.