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. 2023 Mar 28;6:58. doi: 10.1038/s42004-023-00852-2

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© The Author(s) 2023

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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Fig. 3 — DNP-enhanced a {¹H}-¹³C CPMAS spectrum and b {¹⁵N}-¹³C TEDOR spectrum of ¹⁵N-enriched benzylamine functionalized onto CNF. The resonance at 170 ppm in (b) confirms the amide bond formation. Resonance at 175 ppm in (a) is assigned to the unreacted carboxylic acid groups. Asterisks indicate spinning sidebands.