Fig. 4
From: Sensitivity and Reusability of SiO2 NRs@ Au NPs SERS Substrate in Trace Monochlorobiphenyl Detection
a SERS spectra of 1 × 10−5, 5 × 10−5, and 1 × 10−6 M 4-CB measured with the substrate fabricated by sputtering Au for 240 s on SiO2 nanorods. b SERS spectra of 1 × 10−4 M 4-CB repeatedly detected and washed. c PCA score plot of SERS spectra of 4-CB repeatedly detected and washed. d SERS spectra of 1 × 10−4 M 2-CB, 3-CB, and 4-CB repeatedly detected and washed. All of the spectra were average data of spectra measured on three positions randomly selected on each SERS substrate