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. 2016 Dec 7;6:38539. doi: 10.1038/srep38539

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Copyright © 2016, The Author(s)

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(a) and (b) are respectively SERS spectra of the R6G with concentration of 10⁻¹⁵ M from 8 spots on the AgNPs/PCu@Si and GO/AgNPs/PCu@Si substrate. (c) and (d) are the Raman mapping at 613 cm⁻¹ of R6G molecules at 10⁻¹⁵ M dispensed on the GO/AgNPs/PCu@Si substrates and the AgNPs/PCu@Si substrates respectively.