Fig. 3
The uniformity, reproducibility, and durability tests of AgNP/AAO surface-enhanced Raman scattering (SERS) substrate. a SERS spectra of adenine (10−4 M) obtained at seven spots separated by about 10–15 mm on the SERS substrate. b SERS spectra of adenine (10−4 M) obtained at seven different SERS substrates. c SERS spectra of adenine (10−4 M) obtained at delays of 1, 4, 12, and 28 days after production