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. 2010 Sep 8;3(9):4626–4638. doi: 10.3390/ma3094626

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© 2010 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution license (http://creativecommons.org/licenses/by/3.0/).

PMC Copyright notice

XRD patterns of (a) uncoated Cu NPs; (b) Cu/SiO₂ NPs; (c) Cu/SiO₂ NPs one month after preparation. (●) Metallic Cu, (▲) Cu₂O. Reprinted from reference [44] with permission from Elsevier.