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. 2018 Aug 31;13:4977–4986. doi: 10.2147/IJN.S167996

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© 2018 Xue et al. This work is published and licensed by Dove Medical Press Limited

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(A) The scanning electron microscopy images of the gold nanoparticles. (B) The UV–visible absorption of the gold nanoparticles and the gold nanoparticles with serum. (C) SERS spectrum of serum, regular Raman spectrum of serum, and Raman spectrum of the gold nanoparticles. (D) Enlarged figure of regular Raman spectrum of serum. (E) Enlarged figure of Raman spectrum of the gold nanoparticles.

Abbreviations: Abs, absorbance; au, arbitrary unit; SERS, surface-enhanced Raman spectroscopy; SE (U), secondary electron (U); UV, ultraviolet.