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. 2016 Apr 19;11:212. doi: 10.1186/s11671-016-1425-6

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© Zhang 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. 3 — UV-Vis absorption spectra of MB during the reduction catalyzed by Au@void@C composite (a) and the recyclability of the Au@void@C as the catalyst for the reduction of MB with NaBH₄ (b)