Optical properties of metallic nanoparticles in Ni-ion-implanted α-Al[sub 2]O[sub 3] single crystals

Xiang, X.; Zu, X. T.; Zhu, S.; Wang, L. M.
January 2004
Applied Physics Letters;1/5/2004, Vol. 84 Issue 1, p52
Academic Journal
64 keV Ni ion implantation was performed at room temperature up to a dose of 1×10[sup 17] cm[sup -2] in α-Al[sub 2]O[sub 3] single crystals. The charge states, structure, and optical properties of metallic embedded Ni nanoparticles were studied by using x-ray photoelectron spectroscopy (XPS), transmission electron microscopy, and optical spectroscopy, respectively. XPS analysis showed that implanted Ni ions are mainly in charge state of metallic Ni[sup 0]. Nanoparticles distributed from the surface to 30 nm below the surface were observed in a high-angle annular dark-field image. The size of nanoparticles ranges from 1 to 5 nm in diameter. A high-resolution electron microscopy image indicated the Ni-implanted area had been entirely amorphized. A new broad absorption band centered at 400 nm appeared in the optical absorption spectrum of the as-implanted crystal, due to surface plasma resonance of Ni nanoparticles. We did not find any emission band in the as-implanted sample under a Xe lamp excitation wavelength of 250–430 nm in a spectrophotometer. © 2004 American Institute of Physics.


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