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Zn and ZnO nanoparticles fabricated by ion implantation combined with thermal oxidation, and the defect-free luminescence

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7 Author(s)
Amekura, H. ; Nanomaterials Laboratory, National Institute for Materials Science (NIMS), 3-13 Sakura, Tsukuba, Ibaraki 305-0003, Japan ; Umeda, N. ; Sakuma, Y. ; Plaksin, O.A.
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Silica glass implanted with Zn ions of 60 keV to 1.0×1017 ions/cm2 was annealed in oxygen gas to form ZnO nanoparticles (NPs). In as-implanted state, the implanted Zn atoms form Zn metallic NPs inside of the silica. After annealing at 600 °C, ZnO NPs form on the surface, while Zn metallic NPs still remain in the deep region. At 700 °C, most of Zn atoms move to the surface to form the droplet-shaped ZnO NPs which show two photoluminescence bands, i.e., an exciton band at 375 nm and a defect band at ∼500 nm. The defect band almost disappears in the samples annealed at 600 °C, which include both ZnO NPs and Zn NPs.

Published in:

Applied Physics Letters  (Volume:88 ,  Issue: 15 )

Date of Publication:

Apr 2006

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