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. 2019 May 7;24(5):055001. doi: 10.1117/1.JBO.24.5.055001

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© The Authors. Published by SPIE under a Creative Commons Attribution 4.0 Unported License. Distribution or reproduction of this work in whole or in part requires full attribution of the original publication, including its DOI.

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Fig. 2 — (a) TEM image of AuNPs. (b) UV–-vis spectra for bare AuNP and DNA oligomer (left and right) conjugated AuNPs in $1 \times$ PBS. (c) Fluorescence spectra of free Cy5-tagged-left DNA oligomers (green line) and the standard solutions of five different molar ratios of Cy5-tagged-left DNA oligomer to Au NPs (blue 130:1, yellow 87:1, gray 43:1, red 9:1, and sky 0). (d) SERS spectra of free MGITC (yellow line) and their standard solutions of MGITC dye ratio to AuNPs from 120:1 to 20:1.