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. 2016 Mar 18;13(3):334. doi: 10.3390/ijerph13030334

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© 2016 by the authors; licensee MDPI, Basel, Switzerland.

This article is an open access article distributed under the terms and conditions of the Creative Commons by Attribution (CC-BY) license (http://creativecommons.org/licenses/by/4.0/).

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Characterizations of PEI-AgNCs and PEIs with PEI molecular weight from 0.6 kDa to 10 kDa. (a–c) The UV-Vis spectra of PEI-AgNCs and PEIs with PEI molecular weight of 0.6 kDa (a); 1.8 kDa (b) and 10 kDa (c). (d–f) The excitation and emmision spectra of PEI0.6k-AgNCs (d); PEI1.8k-AgNCs (e) and PEI10k-AgNCs (f), respectively.