Abstract
AbstractHerein, a simple bottom‐up method for producing nitrogen and chlorine co‐doped graphene quantum dots (N, Cl‐GQDs) was proposed by utilizing citric acid and 3,4‐dichloroaniline via hydrothermal treatment, and a fluorescent sensor for the detection of tetracycline was demonstrated. These synthesized N, Cl‐GQDs consist mostly of 1–3 layers with a uniform size of about 4.5 nm. Strong blue fluorescence with a quantum yield of 23.2 % was observed from the obtained N, Cl‐GQDs when irradiated with a 365 nm UV light. Systematic studies indicate that N, Cl‐GQDs have several superior features, including excitation‐independent emission, high monodispersity, good stability and water solubility. Moreover, the fluorescence intensity of N, Cl‐GQDs could be significantly quenched by the addition of a small amount of tetracycline. Finally, a fluorescent probe for the detection of tetracycline with a detection limit of 68 nM was proved, which exhibits great potentials for biosensors and biological imaging.
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