Designing Gold Nanoparticle-Ensembles as Surface Enhanced Raman Scattering Tags inside Human Retinal Cells

Figure 1

Normalized extinction spectra of individual gold nanoparticles (spectrum a) and of PEGylated gold nano-ensembles obtained by the addition of: 20 μL (spectrum b), 50 μL (spectrum c) and 100 μL (spectrum d), of mPEG-SH polymer into the colloidal solution.