Sequential Implantation Of Ag Research Articles

Formation of Au−Ag Core−Shell Nanostructures in Silica Matrix by Sequential Ion Implantation

Formation of Au core-Ag shell bimetallic nanoparticles in silica matrix is demonstrated through sequential implantation of Ag and Au ions and subsequent thermal annealing. Formation of core-shell structures is verified through optical absorption spectroscopy, high-resolution transmission electron microscopy, electron energy loss spectroscopy, and simulated optical extinction spectra. A mechanism for the formation of such unusual structures in ion-implanted silica is proposed. By controlling the implantation energy of the two ions properly and keeping the implantation sequence Ag first and then Au, it is possible to create Au core-Ag shell nanoparticles in the silica matrix with homogeneous distribution.

Formation of metal nanoparticles in silica by the sequential implantation of Ag and Cu

Spherical-like nanoparticles have been formed by sequentially ion-implanting Ag/Cu into silica glasses. During sequential Ag/Cu ion implantation, the diameter of Cu nanoparticles is increased and the average Ag nanoparticle diameter is decreased with increasing Cu ion dose. The evolution of nanoparticles is characterized by grazing incidence X-ray diffraction, extended X-ray absorption fine structure spectroscopy and transmission electron microscopy. Nanovoids in the nanoparticles are formed by sequential ion implantation.

Fabrication of Cu-coated Ag nanocrystals in silica by sequential ion implantation

Metal nanocrystal glass composites were fabricated by single and sequential element implantations of Ag + and Cu + ions into high purity silica. Implantation doses (×10 16 ions/cm 2) were 3Ag, 9Cu and 3Ag/9Cu. Composites were analyzed using Rutherford backscattering techniques (RBS), transmission electron microscopy (TEM), energy dispersive spectroscopy (EDS), and optical spectroscopy. An optical density spectrum based on the size distribution observed in the sequentially implanted sample for Cu shell and Ag core nanocrystals has been calculated using the dipole and quadrupole terms in a Mie series summation and is compared with the observed absorption spectrum. Results from TEM and EDS as well as the optical simulations demonstrate that Cu shell and Ag core nanocrystals are formed by the sequential implantation of Ag and Cu.

AG:CD and CD:AG implantations into high purity silica

Silica composites containing nanometer dimension colloids were fabricated by implantation of Ag ions followed by Cd ions, and by implantation of Cd ions followed by Ag ions. These samples were characterized using transmission electron microscopy and optical spectroscopy. Doses used for the sequential implantations were 6×10 16 ions/cm 2 of Ag and Cd in a 1 to 1 ratio. Single element colloids were also fabricated by implantation of Ag or Cd using the same nominal dose and implantation energy as the sequential implantations. Sequential implantation of Ag and Cd leads to the formation of multi-component metal nanoclusters and elemental nanoclusters. Different microstructures were obtained depending on the order of implantation. Optical responses are consistent with results expected from effective medium theory.

Formation and optical characterization of multi-component Ag−Sb nanometer dimension colloids formed by sequential ion implantation in silica

The optical properties of nanometer dimension metal colloids formed by the sequential implantation of Ag then Sb in silica are characterized as a function of the relative concentrations of Ag and Sb implanted. The doses used were in ratios, Ag to Sb, of 9:3, 6:6 and 3:9. Energy of implantation was 305 keV for the Ag and 320 keV for the Sb. Nominal total doses as determined by current integration for the three samples were 12 × 10 16 (Ag + Sb) ions/cm 2 Single element colloids were also made by implantation using the same nominal doses as the sequentially implanted samples. Sequential in plantation of Ag and Sb leads to the formation of multi-component metal nanoclusters. Changes in the composition of the colloids from sequential implantation result in significantly different optical responses for these Samples compared to the single element implanted samples. The optical responses are consistent with results expected from effective medium theory.

Optical properties of multicomponent nanometer dimension metal colloids formed in silica by sequential ion implantation of in and Ag and In and Cu

A series of nanometer dimension colloids in silica have been fabricated by sequential implantation of Ag and In, and a series by sequential implantation of In and Cu. Energies of implantation were chosen using TRIM 89 to overlay the depth distributions of the sequentially implanted ions. The implanted layers were characterized using Rutherford backscattering spectroscopy, transmission electron microscopy, and optical spectroscopy. Nanometer dimension metal multicomponent colloids were formed. The depth distribution, particle size, and optical response of the composites were found to depend strongly on the ion species implanted and the relative ratio of the ion species. The optical responses are correlated with composition of the multicomponent nanoclusters.

Linear and Nonlinear Optical Properties of Metal Nanocluster-Silica Composites Formed by Sequential Implantation of Ag And Cu

AbstractMetal nanocluster-glass composites demonstrate unique optical properties and significant nonlinear response. In this work nanometer dimension metal colloids were formed in silica by sequential implantation of Ag and Cu ions. The Ag and Cu were implanted with relative ratios of Ag to Cu of 9:3,6:6, and 3:9 at a total nominal dose of 12xl016 ions/cm2. TEM techniques were used to examine colloid size and size distributions. The linear optical response was measured from 200 to 900 nm, while the nonlinear optical properties were measured using the z-scan technique at a wavelength of 570 nm. The linear and nonlinear optical properties were found to be dependent upon the ratio of sequentially implanted Ag to Cu and are consistent with effective medium theory.