Nanoscale Biomolecular Detection Limit for Gold Nanoparticles Based on Near-Infrared Response

Figure 5

Plasmon resonance maximum red-shift for the absorption in a core/shell nanoparticle (BaTiO₃ 80 nm, Au 40 nm) with a different number of coating layers of BSA biomolecules (170 mg/mol). Black line represents the uncoated nanoshell, red line represents the coating with a uniform BSA layer, the green line represents two layers and, finally, the cyan line shows the effect of the third layer.