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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 the SERS spectra of the R6G on the GO/AgNPs/PCu@Si and AgNPs/PCu@Si SERS substrate without and with the oxidation treatment. (c) The EDS result of the AgNPs/PCu@Si substrate after the expose of oxygen.