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. 2016 Sep 20;11:412. doi: 10.1186/s11671-016-1640-1

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© The Author(s). 2016

Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.

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Fig. 2 — Representative SEM images of the as-synthesized Ag NPs with different mass ratio of AgNO₃ and PVP. a Sample S1. 1:1.6. b S2, 1:1.3. c S3, 1:1. d S4, 1:0.7. e S5, 1:0.4. f S6, 1:0. aˊ–fˊ The corresponding histogram of particle size distribution (The result was statistically analyzed by JEOL Smile View software with more than 100 resoluble particles)