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. 2018 May 17;8(5):339. doi: 10.3390/nano8050339

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© 2018 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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Catalytic activity of AuNP-MUA as function of MUA packing density on AuNPs. (A) Time-resolved UV-VIS spectra of 4-nitrophenol (4-NP) reduction reaction catalyzed by AuNPs functionalized with 0 µM MUA; (B) Time-resolved UV-VIS spectra of 4-nitrophenol reduction reaction catalyzed by AuNPs and functionalized with 10 µM MUA; and (C) The progress of the reaction tracked by the change in 4-NP absorbance peak at 400 nm over the time.