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, Mw = 10,000 g/mol) and O-(2-Carboxyethyl)polyethylene glycol(PEG-COOH, Mw = 10,000 g/mol) molecules. The modified PEG capped ZnS:Mn nanocrystal powders werethoroughly characterized by XRD, HR-TEM, EDXS, ICP-AES and FT-IR spectroscopy. The optical propertieswere also measured by UV/Vis and photoluminescence (PL) spectroscopies. The PL spectra showed broademission peaks at 600 nm with similar PL efficiencies of 7.68% (ZnS:Mn-PEG-NH2) and 9.18% (ZnS:Mn-PEG-COOH) respectively. The measured average particle sizes for the modified PEG capped ZnS:Mnnanocrystals by HR-TEM images were 5.6 nm (ZnS:Mn-PEG-NH2) and 6.4 nm (ZnS:Mn-PEG-COOH),which were also supported by Debye-Scherrer calculations. In addition, biological toxicity effects of thenanocrystals over the growth of wild type E. coli were investigated. They showed no biological toxicity toE. coli until very high concentration dosage of 1 mg/mL of the both nanocrystal samples.Key Words : ZnS:Mn nanocrystal, Polyethylene glycol derivatives capping, Water-dispersible nanocrystal,Biological toxicity IntroductionNanosized semiconductor materials have gained signi-ficant attention over the past decade.

bulletin of the korean chemical society

Syntheses of Biologically Non-Toxic ZnS:Mn Nanocrystals by Surface Capping with O-(2-aminoethyl)polyethylene Glycol and O-(2-carboxyethyl)polyethylene Glycol Molecules