title: Synthesis and spectroscopic characterization of water-soluble Mn-doped ZnO(x)S(1-x) quantum dots.
abstract: A non-cadmium and water-soluble Mn-doped ZnO(x)S(1-x) QDs was synthesized with denatured bovine serum albumin (dBSA) as stabilizer under nitrogen atmosphere, and the as-prepared products were characterized by X-ray powder diffraction (XRD), UV-vis absorption spectroscopy, fluorescence (FL) emission spectroscopy, high resolution transmission electronmicroscopy (HRTEM) and Raman spectrum. XRD patterns indicate that the Mn-doped ZnO(x)S(1-x) QDs have a zinc-blende structure, and that manganese emerges in the form of divalent manganese (Mn(2+)) and trivalent manganese (Mn(3+)) (the intermediate of the reaction). The size of Mn-doped ZnO(x)S(1-x) QDs is about 3.2±0.7 nm according to HRTEM imaging. The FL spectra reveal that the Mn-doped ZnO(x)S(1-x) QDs have two distinct emission bands: the defect-related emission and the Mn(2+)-related emission, which exhibit a competing process. A good FL signal of the transition of Mn(2+) ((4)T(1)-(6)A(1)) is observed when the doping amounts are 1.0% and 20% respectively, and the as-prepared solutions are stable for more than 6 months at 4°C. This method has the advantages of good stability and environment-friendly stabilizer, for involving no heavy metal ions or toxic reagents.
authors.affiliation: College of Science, State Key Laboratory of Agricultural Microbiology, Institute of Chemical Biology, Huazhong Agricultural University, Wuhan, People's Republic of China.
authors.forename: Fangfang
authors.initials: F
authors.lastname: Xue
authors.forename: Jiangong
authors.initials: J
authors.lastname: Liang
authors.forename: Heyou
authors.initials: H
authors.lastname: Han
mesh_terms: D000818:Animals; D002417:Cattle; D008345:Manganese / Q000737:chemistry*; D011489:Protein Denaturation; D045663:Quantum Dots; D012710:Serum Albumin, Bovine / Q000737:chemistry*; D013057:Spectrum Analysis; D013457:Sulfur Compounds / Q000737:chemistry*; D014961:X-Ray Diffraction; D015034:Zinc Oxide / Q000737:chemistry*
chemical_list: D013457:Sulfur Compounds; D012710:Serum Albumin, Bovine; D008345:Manganese; D015034:Zinc Oxide