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. 2019 Apr 3;9(4):529. doi: 10.3390/nano9040529

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© 2019 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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(a) Comparison of Fourier transform infrared (FT-IR) spectra of the b-CDs and g-CDs; (b) Comparison of FT-IR spectra of the y-CDs and r-CDs; (c) Comparison of high resolution of C 1s X-ray photoelectron spectroscopy (XPS) spectra of the b-CDs and g-CDs; (d) Comparison of high-resolution C 1s XPS spectra of the y-CDs and r-CDs.