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. 2016 Apr 12;11:187. doi: 10.1186/s11671-016-1417-6

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© Ramanery et al. 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. 4 — XPS spectra of Bi₂S₃ nanoconjugate (QD_CHI0.67_3.5): Bi 4f region (a) before and (c) after Ar⁺ etching and S 2s region (b) before and (d) after Ar⁺ etching. A two-column figure