Fig. 1From: New Immunosensing-Fluorescence Detection of Tumor Marker Cytokeratin-19 Fragment (CYFRA 21-1) Via Carbon Quantum Dots/Zinc Oxide Nanocompositea High-resolution transmission electron microscope (HRTEM) image of CQDs with diameter 5 nm and b size distribution graph of the CQDs based on the TEMBack to article page