Synthesis of copper nanoparticles in polycarbonate by ion implantation

Abstract

Copper nanoparticles have been synthesized in polycarbonate by 75 KeV Cu -ion implantation with various doses ranging from 6⋅4 × 10 15 to 1⋅6 × 10 17 ions/cm 2 with a beam current density of 800 nA/cm 2 . The composites formed were structurally characterized using Ultraviolet-Visible (UV-Visible) absorption spectroscopy. The appearance of particle plasmon resonance peak, characteristic of copper nanoparticles at 603 nm in absorption spectra of polycarbonate implanted to a dose of 1⋅6 × 10 17 ions/cm 2 , indicates towards the formation of copper nanoparticles in polycarbonate. Transmission electron microscopy further confirms the formation of copper nanoparticles having size ~ 3⋅15 nm. The formation of copper nanoparticles in the layers carbonized by Cu -implantation has been discussed. The synthesized copper-polycarbonate nanocomposite has been found to be more conducting than polycarbonate as ascertained using current-voltage characteristics.

Effect of interparticle plasmon coupling and temperature on the optical properties of bimetallic composite nanoparticles with a core-shell structure

“…5 When the CNPs are subjected to radiation they exhibit strong peaks in the absorption spectra at a specific wavelength called the SPR wavelength. 13 Since nanoparticles have dimensions much smaller than the wavelength of light, thus by solving of Laplace's equation with the boundary conditions at the interfaces, the electric field distribution in different regions of cylindrical and spherical core-shell nanoparticles can be obtained. The dependence of the SPR on nanoparticle dimensions can be found in the polarizability, which a is determined byp ¼ e 0 e h aðxÞẼ because the electric field induces a dipole moment inside the nanoparticle.…”