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. 2022 Jul 14;12(14):2414. doi: 10.3390/nano12142414

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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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XPS spectra. (a) Full spectra of HNTs, NH₂-HNTs and Pd/NH₂-HNTs; (b) Pd spectra of Pd/HNTs; (c) Pd spectra of Pd/NH₂-HNTs; (d) Pd spectra of PdAg/NH₂-HNTs; (e) PdAu spectra of Pd/NH₂-HNTs.