Fig. 6. Spectral responses of gold particles in different regions of both cell lines (outside or periphery and inside).

a HepG2 cells with sphere-shaped particles showing a plasmonic shift from 693 nm to 756 nm for outside and inside particles. b HepG2 cells with nanostars, showing a plasmonic shift from 783 nm to 840 nm for outside and inside particles. c HepG2 cells with SB particles and the plasmonic shift from 753 nm to 817 nm. d Spectra of three different morphologies of particles in different regions of HepG2. e A549 cells with sphere-shaped particles showing a plasmonic shift from 680 nm to 724 nm for outside and inside particles. f A549 cells with nanostars, showing a plasmonic shift from 760 nm to 801 nm. g A549 cells with SB particles and the plasmonic shift from 760 nm to 850 nm. h Spectra of three different morphologies of particles in different regions of A549 cells. Scale bar is 20 µm