Chloride ion (cl-) 1 Chloride ions 1 Chlorine compounds 1 Cl- ions 1 Cystic fbrosis 1 Cystic fibrosis 1 Fluorescence quenching 1 Graphene 1 Graphene quantum dot 1 Ion chromatography 1 Ion detection 1 Ion exchange 1 Ions 1 Nanocrystals 1 Optical bio-sensors 1 Semiconductor quantum dots 1 Synthesised 1 chloride ions (Cl-) 1 citric acid 1 cystic fbrosis 1 fluorescence quenching 1 graphene quantum dot (GQD)