Biomass-derived nitrogen doped graphene quantum dots with color-tunable emission for sensing, fluorescence ink and multicolor cell imaging

Dansyl-modified carbon dots with dual-emission for pH sensing, Fe3+ ion detection and fluorescent ink

“…It indicates the CSCDs@DC ink is satisfactorily stable and retains the FL property for a long time. 67 Herein, this study proved that the CSCDs@DC can be used as an alternative of uorescent ink in anti-counterfeiting, information storage and information encryption elds.…”

Graphene Quantum Dots as Flourishing Nanomaterials for Bio-Imaging, Therapy Development, and Micro-Supercapacitors

“…In this case, the Ag + ion detection was enabled via N-GQDs with an LOD of 1.2 nM via ‘turn-off’ principle. The quantification of Ag + ions in water samples is significant for environmental analysis, since excess Ag + ions may cause toxic effect in skeletal system and liver as indicated by the World Health Organization (WHO) [ 143 ]. Due to this reason, it was shown in sensing experiments that N-GQDs were extremely sensitive for the Ag + ions compared to the other metal ions.…”

“…In this study, the PL intensity was in correlation with the pH levels of the medium where the optimum quenching value was obtained at pH 7.0 while the different wavelengths generated multicolor emissions to enable cell imaging. Moreover, when N-GQDs were incubated with fibroblast cells, it was observed that there was almost no toxicity in the system [ 143 ].…”

“…Blue, green, and yellow emissions were obtained under 472, 509, and 565 nm, respectively. ( c ) The correlation between the increasing amounts of N-GQDs and fibroblast cell viability [ 143 ].…”

Do amino acid functionalization stratagems on carbonaceous quantum dots imply multiple applications? A comprehensive review

“…The synthetic sources include coal, 14 carbon black, graphite, 15 graphene oxide, 16 reduced graphene oxide, CNT, biological entities, 17 rice husk, 18 organic compounds (benzene, diamine benzene, 1,3,5-trimethyl benzene, etc. ), 19,20 biomass, humus, 21,22 carbon black, 23 biomolecules, 24 as well as amino acids, [25][26][27][28] chitosan, 29 and kitchen sources (fenugreek, fennel seeds, garlic, egg yolk oil, orange juice, lemon peel, peanut shell, tea, etc.). [30][31][32] For the synthesis of QDs, the source is very important as it can affect the size, purity, and luminescence behavior of the QDs synthesized.…”