Fig. 5From: SERS Detection of Biomolecules by Highly Sensitive and Reproducible Raman-Enhancing Nanoparticle Array a SERS spectra of adenine, thymine, cytosine, and guanine (10−4 M). b SERS spectra of adenine at different concentrations (from 10−4 to 104 ppm). c Integrated area of 732.8 cm−1 peak of adenine (\( {I}_{732.8}^{*} \)) as a function of concentrationBack to article page