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. 2016 Feb 29;11:110. doi: 10.1186/s11671-016-1326-8

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© Sun 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 — The effect of pH for the CDs. a PL spectra for various pH in the range 1–14. b The PL intensity of pH variation. c The absorption spectra of CDs in aqueous solution under pH = 1 and 13. d The photographs of CDs under room light at pH = 1, 7, and 13