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. 2019 Mar 13;14:94. doi: 10.1186/s11671-019-2928-8

Fig. 8.

Fig. 8

a Raman spectra of the single-layer and dual-layer porous Au film structures and ultrathin Au film. b Intensity changes of several typical Raman peaks observed in the three Raman curves in a. The sputtering time for each layer of porous Au films and film is 75 s