Fig. 4From: New Immunosensing-Fluorescence Detection of Tumor Marker Cytokeratin-19 Fragment (CYFRA 21-1) Via Carbon Quantum Dots/Zinc Oxide NanocompositeSpectroscopic spectra of CQDs/ZnONPs a UV-Vis spectrum at absorption peak at 370 nm and b photoluminescence spectrum of CQDs/ZnONPs at λex = 470 and λem = 520 nmBack to article page