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

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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