Figure 2From: Surface-enhanced Raman spectra of medicines with large-scale self-assembled silver nanoparticle films based on the modified coffee ring effectAbsorption spectra and particle size distribution of nanoparticles. (a) Absorption spectra of silver nanoparticles. The inset shows the image of silver nanoparticles obtained by transmission electron microscopy; the scale of the image is 20 nm. (b) The particle size distribution of 500 nanoparticles.Back to article page