“…The coordination of Cu 2+ to the inherent ligands (NH 2 /NH/N) results in PET from mpg ‐ CN to Cu 2+ , quenching the FL of mpg ‐ CN, and a detection limit of 12.3 × 10 −9 m . The same sensing mechanism was employed to detect other metal ions, including Hg 2+ , Fe 3+ , Ag + , and Cr 6+ , and analytes that attach to the surface of g‐CN via π−π stacking, hydrogen bonding, and electrostatic interactions (e.g., 2,4,6‐trinitrophenol, N ‐nitrosopyrrolidine, tetracycline, and heparin) . These FL sensors in which g‐CN plays dual roles as both recognition elements and signal reporters suffer from poor selectivity.…”