Figure 4From: Intracellular ZnO Nanorods Conjugated with Protoporphyrin for Local Mediated Photochemistry and Efficient Treatment of Single Cancer CellFlorescence (Fl) spectra of ZnO NRs, without (a) and (b) with protoporphyrin, respectively. These spectra were taken using a laser line of wavelength of 240 nm as an excitation source from a PTI-Fluorescence systemBack to article page