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) SERS spectra of 10−3 M R6G on different SERS substrates (DW30, DW40, DW50, DW60, and DW70). (b) A comparison of the intensity of Raman characteristic peak in image (a) at 1649 cm−1 between different SERS-active substrates. (c) SERS spectrum of 10−4 M 4-ATP on the DW50 substrate (A) and Raman spectrum of solid 4-ATP (B). (d) SERS spectra of 4-ATP for different concentrations on the substrate of DW50. (e) SERS spectra of 4-ATP at the concentration of 10−3 M on 25 randomly selected positions of the DW50 substrates. (f) SERS mapping (, step size) of the characteristic peak of 4-ATP at 1380 cm−1 on the DW50 substrates.