Departmental Bulletin Paper 水中レーザーアブレーション法によるMn添加TiO2ナノ粒子の合成

金丸, 峻士

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Crystalline TiO2 nanoparticles(NPs) were synthesized by laser ablation in water and H2O2 aqueous solutions.Rutile NPs were prepared in pure water. H2O2 addition increased the oxygen partial pressure in a gas phase of nucleation stage, and induced anatase formation. While Mn doping suppressed formation of anatase phase. This caused by substitution of Mn which has lower valence than Ti4+ and resultant increase of oxygen vacancyconcentration. NPs synthesized in H2O2 aqueous from non-doped target were well dispersed, while from Mndoped target mesh shaped structures were formed. Zeta- potential of suspensions containing these NPs show relatively large negative values.Key Words : nanoparticles, TiO2, morphology
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