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. 2015 Jan 27;13:5. doi: 10.1186/s12951-015-0065-9

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© Zou et al.; licensee BioMed Central. 2015

This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly credited. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.

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Characterization result of PVP coated Ag NPs using various analytical techniques. A) Transmission electron microscopy (TEM) image of NPs showing the polydispersity in size and shape of the PVP coated AgNPs. B) TEM particle size distribution of NPs (n = 200, mean = 21 ± 8 nm), C) X-ray diffraction pattern for Ag NPs indicating the presence of metallic silver (ICDD 004–0783). D-E) XPS analysis on Ag NPs without any sputtering indicating the presence of high amount of organic impurities (PVP used as a surfactant). Sputtered spectrum (E) confirms the presence of the organic components only on the surface. F) Hydrodynamic size of the NPs when suspended in deionized water, measured using dynamic light scattering.