Fig. 4
From: Graphene quantum dot nanocomposites: electroanalytical and optical sensor technology perspective
a Schematic showing the modification of GCE with the CuNC@N-GQDs and the resultant enhanced sensing of DA, SER, and NIC; b the oxidation mechanisms of DA, SER, and NIC on CuNC@N-GQD/GCE; c a diagrammatic representation of the enhanced release of DA and SER in the brain during NIC intake; d a flowchart showing the functional correlation between DA, SER, and NIC; and e the interactions among CuNC@N-GQDs and the analytes DA, SER, NIC, EP, and NEP based on the structural and functional features (Reproduce with permission from Ref. Saisree et al. 2022, Copyright 2022, Royal Society of Chemistry)