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Optical and electrical properties of the copper-carbon nanocomposites

Ghodselahi, T ; Sharif University of Technology | 2008

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  1. Type of Document: Article
  2. DOI: 10.1117/12.780873
  3. Publisher: 2008
  4. Abstract:
  5. We prepared copper-carbon nanocomposite films by co-deposition of RF-Sputtering and RF-PECVD methods at room temperature. These films contain different copper concentration and different size of copper nanoparticles. The copper content of these films was obtained from Rutherford Back Scattering (RBS) analyze. We studied electrical resistivity of samples versus copper content. A metal-nonmetal transition was observed by decreasing of copper content in these films. The electrical conductivity of dielectric and metallic samples was explained by tunneling and percolation models respectively. In the percolation threshold conduction results from two mechanisms: percolation and tunneling. In the early stage of nonmetal-metal transition a reverse effect of metallic to nonmetallic state occurs by increasing metal content. We also study the effect of percolation on Surface Plasmon Resonance (SPR) peak of Cu nanoparticles in visible spectra. The width of this peak is raised by increasing number of percolated nanoparticles. Also position of this peak is shifted to the larger wavelength by decreasing resistivity of film. Mie theory was used for the dielectric sample. Using Mie theory, the size of copper core and copper oxide shell, the dielectric constant of shell and carbon host are estimated from SPR peak. The activation tunneling energy that was obtained from estimated value of Mie theory is consistent with that one obtained from temperature dependence of electrical resistivity. Atomic Force Microscopy (AFM) image shows particle size and coalescence of the nanoparticles
  6. Keywords:
  7. Activation energy ; Atomic force microscopy ; Carbon ; Carbon films ; Chemical activation ; Cobalt ; Cobalt compounds ; Copper ; Electric conductivity ; Electric properties ; Electric resistance ; Energy resources ; Estimation ; Excavation ; Imaging techniques ; Metal analysis ; Microscopic examination ; Nanocomposites ; Nanoparticles ; Nanostructured materials ; Nanostructures ; Numerical methods ; Percolation (fluids) ; Percolation (solid state) ; Photoacoustic effect ; Photonics ; Plasma enhanced chemical vapor deposition ; Scanning probe microscopy ; Shells (structures) ; Solvents ; Sputter deposition ; Surface plasmon resonance ; Thermoelectricity ; Tunneling (excavation) ; (O-sec.-butyldithiocarbonatio-S ,S') copper ; Atomic force microscopy (AFM) ; carbon nanocomposites ; Co-deposition ; copper concentrations ; Copper contents ; Copper core ; Copper nano-particles ; Cu nano-particles ; Dielectric constants ; Different sizes ; Electrical conductivity ; Electrical resistivities ; metal contents ; Metal nonmetal transition ; Metal transitions ; Metallic samples ; Mie theory ; Nano-composite films ; Nano-photonics ; Optical and electrical properties ; Oxide shells ; Percolation models ; Percolation thresholds ; RF PECVD ; Rf-Sputtering ; Room-temperature (RT) ; Rutherford backscattering (RBS) ; Surface plasmon resonance (SPR) ; Temperature dependences ; Tunneling energies ; Visible spectrum (VIS) ; Copper oxides
  8. Source: Nanophotonics II, Strasbourg, 7 April 2008 through 9 April 2008 ; Volume 6988 , 2008 ; 0277786X (ISSN); 9780819471864 (ISBN)
  9. URL: https://www.spiedigitallibrary.org/conference-proceedings-of-spie/6988/1/Optical-and-electrical-properties-of-the-copper-carbon-nanocomposites/10.1117/12.780873.full?SSO=1