3 years ago

Luminescent, low-toxic and stable gradient-alloyed Fe:ZnSe(S)@ZnSe(S) core:shell quantum dots as a sensitive fluorescent sensor for lead ions.

Reza Sahraei, Ehsan Soheyli, Fereshteh Nazari, Reza Tabaraki, Golamreza Nabiyouni, Behnaz Ghaemi
In this paper, an aqueous-based approach is introduced for facile, fast, and green synthesis of gradient-alloyed Fe-doped ZnSe(S)@ZnSe(S) core:shell QDs with intense and stable emission. Co-utilizing of co-nucleation and growth doping strategies, along with systematic optimization of emission intensity, provide a well-controllable/general method to achieve internally doped-quantum dots (d-dots) with intense emission. Results indicated that the alloyed ZnSe(S)@ZnSe(S) core:shell QDs have a gradient structure which consists of the Se-rich core and the S-rich shell. This gradient structure can not only passivate the core d-dots by means of the wider band gap S-rich shell, but also minimizes the lattice mismatch between alloyed core-shell structures. Using this novel strategy and utilizing the wider band gap S-rich shell can obviously increase the cyan emission intensity and also drastically improved the emission stability against chemical and optical corrosions. Furthermore, the MTT cytotoxicity experiments indicated that the obtained d-dots are non-toxic nanomaterials and thus, they can be considered as the promising alternative of conventional cadmium-based QDs for fluorescent probes in biological fields. Finally, it was demonstrated that the present low-toxic and gradient-alloyed core:shell d-dots can be used as a sensitive chemical detector for Pb2+ ions with excellent selectivity, small detection limit, and rapid response time.

Publisher URL: http://doi.org/10.1088/1361-6528/aada29

DOI: 10.1088/1361-6528/aada29

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