[16p-P08-1~5] 9.2 Nanoparticles, Nanowires and Nanosheets

[16p-P08-3] ZnO NPs aggregation suppressed by surface modification

〇Masatoshi Fujii¹, Mari Iitsuka¹ (1.Shimane Univ.)

Keywords:zinc oxide

Zinc oxide (ZnO) is used as ultraviolet light emitters and are widely used as safety white pigment for baby powder. Thus, ZnO has a potential to use as light emitter for medical field. ZnO NPs, however, have surface activity. ZnO NPs dispersion cannot keep dispersive stabilization. In this study, ZnO NPs were prepared in MeOH solution by a precipitation method, and the relationship between their optical absorption and emission profiles and their preparation and surface modified conditions were investigated. UV-vis absorption edge wavelengths of ZnO NPs as-prepared were observed at around 340 nm. Exciton emission peak wavelengths were also observed at around 335 nm. After modification by silane coupling agent, APTES, for the ZnO NPs, both UV-vis absorption edge wavelengths and exciton emission peak wavelengths show little red-shift. This small shift indicates that the ZnO NPs scarcely grow and keep dispersive stabilization. In addition, relationship between area-strength of defect emission and amount of APTES addition suggests that the surface coverage ratio of APTES has a important role for suppress the NPs aggregation.