Figure 4From: Hybrid gold-iron oxide nanoparticles as a multifunctional platform for biomedical application Representative UV–vis absorbance spectra (arbitrary units, a.u.) of nanoparticles of Fe 3 O 4 -PEI, Au seeds, Fe 3 O 4 -PEI-Au seed , Fe 3 O 4 -PEI-Au coat and Fe 3 O 4 -PEI-Au-PEG. Back to article page