Abstract
Novel bifunctional nitrogen-doped carbon dots (N-CDs) were prepared through solid-phase thermal treatment of melamine and citric acid monohydrate (CA) as precursors. The N-CDs displayed uniform size distribution, excellent photostability and bright fluorescence emission with the fluorescence quantum yield of 24 %. The N-CD-based fluorescence “on–off-on” sensing platform exhibited rapid, selective and sensitive detection of TCs (tetracycline hydrochloride and doxycycline) and Al3+. The fluorescence at 472 nm can be quenched by TCs through the internal filtration effect (IFE) and can also be recovered with the addition of Al3+ by the stronger affinity between Al3+ and TCs than that of CDs. The fluorescent sensor exhibits excellent selectivity and high sensitivity toward TCs and Al3+ detection with low detection limits for tetracycline hydrochloride: 91.8 nM, doxycycline: 78 nM and Al3+: 163.5 nM. Moreover, the proposed sensing platform is utilized for detecting TCs and Al3+ in tap water and milk samples. In addition, the N-CD probe can be used for cell imaging based on its low toxicity and good biocompatibility, implying the potential applications in the fields of biomarkers and bioanalysis in vivo imaging studies.
Published Version
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