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http://dx.doi.org/10.5012/bkcs.2012.33.5.1741

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  

Lim, Eun-Ju (Department of Applied Physics, Dankook University, Center for Photofunctional Energy Materials (GRRC program), Institute of Nanosensor and Biotechnology)
Park, Sang-Hyun (Department of Chemistry, Dankook University, Center for Photofunctional Energy Materials (GRRC program), Institute of Nanosensor and Biotechnology)
Byun, Jong-Hoe (Department of Molecular Biology, Dankook University, Center for Photofunctional Energy Materials (GRRC program), Institute of Nanosensor and Biotechnology)
Hwang, Cheong-Soo (Department of Chemistry, Dankook University, Center for Photofunctional Energy Materials (GRRC program), Institute of Nanosensor and Biotechnology)
Publication Information
Abstract
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 ${\mu}g$/mL. Low biological toxicities were seen at doses less than 10 ${\mu}g$/ mL for all nanocrystals.
Keywords
ZnS:Mn nanocrystal; Amino acid capping; Water-dispersible nanocrystal; Orange emitting nanophosphor; Toxicity of nanocrystal;
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