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Bulletin of the Korean Chemical Society (BKCS)

ISSN 0253-2964(Print)
ISSN 1229-5949(Online)
Volume 33, Number 5
BKCSDE 33(5)
May 20, 2012 

Syntheses and Characterizations of Serine and Threonine Capped Water-Dispersible ZnS:Mn Nanocrystals and Comparison Study of Toxicity Effects on the growth of E. coli by the Methionine, Serine, Threonine, and Valine Capped ZnS:Mn Nanocrystals
Eunju Lim, Sanghyun Park, Jonghoe Byun, Cheong-Soo Hwang*
ZnS:Mn nanocrystal, Amino acid capping, Water-dispersible nanocrystal, Orange emitting nanophosphor, Toxicity of nanocrystal
Water-dispersible ZnS:Mn nanocrystals were synthesized by capping the surface of the nanocrystals with conventional aminoacids ligands: serine and threonine. The aminoacids capped ZnS:Mn nanocrystal powders were characterized by XRD, HR-TEM, EDXS, ICP-AES and FT-IR spectroscopy. The optical properties were also measured by UV/Vis and solution photoluminescence (PL) spectroscopies in aqueous solvents. The solution PL spectra showed broad emission peaks around 600 nm with PL efficiencies of 9.7% (ZnS:Mn-Ser) and 15.4% (ZnS:Mn-Thr) respectively. The measured particle sizes for the aminoacid capped ZnS:Mn nanocrystals by HR-TEM images were about 3.0-4.0 nm, which were also supported by Debye-Scherrer calculations. In addition, cytotoxic effects of four aminoacids capped ZnS:Mn nanocrsystals over the growth of wild type E. coli were investigated. Although toxicity in the form of growth inhibition was observed with all the aminoacids capped ZnS:Mn nanocrystals at higher dose (1 mg/mL), ZnS:Mn-Met and ZnS:Mn-Thr appeared non-toxic at doses less than 100 μg/mL. Low biological toxicities were seen at doses less than 10 μg/ mL for all nanocrystals.
1741 - 1747
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