Fig. 1From: A Widely Applicable Silver Sol for TLC Detection with Rich and Stable SERS FeaturesUV–Vis spectroscopy and SEM image characterization of a UV–Vis spectra of AgNPs-DMF obtained at different heating times and b corresponding R6G SERS spectra. All spectra were normalized to the 865-cm−1 peak. c SEM image of AgNPs-DMF obtained at a 1-min heating timeBack to article page