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. 2018 Apr 28;8(5):289. doi: 10.3390/nano8050289

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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) SERS mapping (step size is 1 μm) of one same Au/DW substrate. (B) Raman spectra of 10⁻⁶ M 4-ATP obtained from 36 randomly selected spots on Au/DW substrate.