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(a) Digital photograph of mussel shell, and the inset showing a water droplet on its surface. (b) CAs of mussel shell before and after the self-assembly of Au@AgNPs. (c) Optical absorption spectra of mussel shell before and after the self-assembly of Au@AgNPs. (d) SERS spectra of R6G solution recorded with two laser excitations. EDS spectra of mussel shell before (e) and after (f) the self-assembly of Au@AgNPs. Au@AgNPs with a 5 nm shell thickness were used in all cases.
