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. 2019 Apr 17;9(4):622. doi: 10.3390/nano9040622

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© 2019 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 (CC BY) license (http://creativecommons.org/licenses/by/4.0/).

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Absorption spectra (A) and TEM images of samples collected after (B) 4 days, (C) 6 days, or (D) 8 days and passivated with thiol 2. The color of the line in the inset in each TEM image links it to the corresponding UV–Vis spectrum in A.