Synthesis and Photoluminescent Properties of Wurtzite ZnS Nanorods by Hydrothermal and Co-precipitation Methods(Synthesis and Processing,<Special Issue>Guest Editors Dedicated to Prof. Gunter Petzow: Modern Trends in Advanced Ceramics)

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Nanorods of wurtzite ZnS were synthesized by a hydrothermal method at 200℃ and a co-precipitation method at room temperature in the presence of ethylenediamine (en) aqueous solutions. It was found that the wurtzite ZnS nanorods with uniform diameter around 80±20nm, length about 300±100 nanometer appears at a proper concentration of en, unit [Zn] : [S] ratio, and an appropriate duration by the hydrothermal method. Much longer wurtzite ZnS nanorods with length from 300 to 2000nm and diameter from 80 to 200nm were obtained via the co-precipitation method. A very minor undecomposed ZnS・0.5en phase coexisted with the wurtzite ZnS nanorods in the co-precipitation method was identified and arguably thought to be due to the low temperature used. ZnO coated ZnS core-shell structures were successfully fabricated by annealing the ZnS nanorods in an oxygen flow at 650℃ for 3-5min. The coating of ZnO layer on ZnS nanorods results in a significant increase of photoluminescence (PL) intensity (30 times) at 490-500nm visible regions for those of hydrothermal method and mild increase (double) for those of co-precipitation method.
社団法人日本セラミックス協会の論文
2006-11-01