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. 2018 Dec 29;12(1):103. doi: 10.3390/ma12010103

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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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(a) SEM images of facet ${CeO}_{2}$ films with gold nanoparticles (AuNP); scale bars are $1 μ$ m and $200$ nm for the top and bottom images, respectively; (b) SERS intensity for four Raman shifts from conjugate of DTNB/AuNP on ${CeO}_{2}$ films as function of the film thickness (after normalization that is the Raman signal is divided into the number of AuNP in the spot, where the signal is collected from).