Fabrication of valine-functionalized graphene quantum dots and its use as a novel optical probe for sensitive and selective detection of Hg2.

摘要: The functionalization of graphene quantum dots has become a powerful method to modulate its chemical, electronic and optical properties for various applications. In the study, we reported facile synthesis valine-functionalized (Val-GQDs) use as novel fluorescent probe detection Hg2+. Herein, Val-GQDs was synthesized by thermal pyrolysis citric acid valine. resulting an average size 3nm edge sheets contains rich hydrophilic groups, leading high water-solubility. Compared GQDs prepared acid, exhibits stronger fluorescence (>10-fold) better photostability (>4-fold). Interestingly, existence valine moieties in results more sensitive response signal will linearly decrease with increase Hg2+ concentration range from 0.8nM 1μM correlation coefficient 0.992. limit is 0.4nM (S/N=3), which sensitivity >14-fold that GQDs. analytical provides prominent advantage sensitivity, selectivity stability. It been successfully applied real water samples. study also promising approach design functionalized meet needs further applications sensing catalysis.