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. 2020 Mar 24;10(3):597. doi: 10.3390/nano10030597

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© 2020 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 (http://creativecommons.org/licenses/by/4.0/).

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Characterization of the designed nanocomposites. (A) Fourier-transform infrared spectroscopy (FTIR) spectra exploring various chemical functionalities of Cu-MSNs and their successive samples, (i) pristine Cu-MSNs, (ii) surfactant template-extracted Cu-MSNs, (iii) Cu-MSN-TET, and (iv) PEI-SNP@Cu-MSN-TET. (B) Electron spin resonance (ESR) spectra of (i) Cu-MSNs, (ii) Cu-MSN-TET, (iii) PEI-SNP@Cu-MSN-TET, and (iv) the spectrum of PEI-SNP@Cu-MSN-TET, recorded after the release study in the buffered saline (pH-5.5).