Furthermore, we compared separate mono-equivalents of the GO-PEI-GQDs complex - GO and GQDs, in terms of cell imaging (diagnostics), photothermal, and oxidative stress response in breast cancer cells (MDA-MB-231).  GO-PEI-GQDs showed an excellent photothermal response (44-49 °C) upon 808 nm laser (0.5 W cm-2) exposure for 5 min at a concentration up to 50 μg/mL.  We report new synergistic properties of GO-PEI-GQDs such as stable fluorescence imaging and enhanced photothermal and cytotoxic activities on cancer cells. 
THERM