Optical properties of metallic nanoparticles in Ni-ion-implanted α-Al2O3 single crystals

Abstract

64 keV Ni ion implantation was performed at room temperature up to a dose of 1ϫ10 17 cm Ϫ2 in ␣-Al 2 O 3 single crystals. The charge states, structure, and optical properties of metallic embedded Ni nanoparticles were studied by using x-ray photoelectron spectroscopy ͑XPS͒, transmission electron microscopy, and optical spectroscopy, respectively. XPS analysis showed that implanted Ni ions are mainly in charge state of metallic Ni 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.

Ceramic/metal biocidal nanocomposites for bone-related applications

“…A remarkable new approach to try to solve this problem has focused on ceramic matrix composites with metal particles embedded as a second phase, which have been proved to present mechanical and functional features which are useful for a wide range of applications [5][6][7][8][9][10]. It deals specifically with a hydroxyapatite matrix [HA, Ca 10 (PO 4 ) 6 (OH) 2 ] with embedded silver nanoparticles (HA/Ag) [11,12].…”

Effects of annealing on optical properties of Zn-implanted ZnO thin films

“…It is known that the formation of nanoparticles/clusters during highdose ion implantation may effectively affect optical absorption. Several authors [11,12] have observed evident surface plasmon peaks in optical absorption spectra after high-dose ion implantation, which is attributed to the effect of nanoparticles/clusters formed during ion implantation. In our experiment, there is no clear evidence of plasmon peaks in the optical absorption spectra.…”

Chemical synthesis of self-assembled Ni nanoparticles and understanding of nonmagnetic layer inside their surface

“…Compared to physical methods, chemical methods are advantageous because high yields of metal nanoparticles are obtained and the diameter and shape are easily controlled by changing the chemical conditions. We focused on Ni nanoparticles to promote the application of magnetic nanoparticles to a variety of fields because they have both a high magnetic potential and high surface plasmon resonance absorption [3]. Although Ni nanoparticles have been synthesized by various chemical methods [4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20], few studies of the diameter dependence of the magnetic properties for Ni nanoparticles have systematically been investigated in detail.…”