A general method for large-scale fabrication of Cu nanoislands/dragonfly wing SERS flexible substrates
Wang Yuhong1, Wang Mingli1, †, Shen Lin2, Zhu Yanying1, Sun Xin1, Shi Guochao1, Xu Xiaona1, Li Ruifeng1, Ma Wanli3
       

(color online) (a)–(d) Top-view SEM images of DW30, DW40, DW50, and DW70, respectively. (e) Side-view SEM image of the DW50 substrate.