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Paper   IPM / Physic / 15072
School of Physics
  Title:   Electrical percolation threshold in Ag-DLC nanocomposite films prepared by RF-sputtering and RF-PECVD in acetylene plasma
1.  S. Abdolghaderi
2.  B. Astinchap
3.  A. Shafiekhani
  Status:   Published
  Journal: J. Mat. Sci.
  Vol.:  27
  Year:  2016
  Pages:   6713-6
  Supported by:  IPM
Silver-diamond like carbon (Ag-DLC) nanocomposite films were deposited on glass and silicon substrates by co-deposition of RF-sputtering and RF-PECVD method in acetylene plasma. The effects of deposition time on creation of conductive percolation pathway in Ag-DLC nanocomposite films were investigated. The films were characterized by XRD pattern, AFM images, UV-Vis and FTIR spectra. Pressure of chamber-s variation over time was illustrated the rate of carbon and silver deposition changing. The results showed that nanoparticles- size and surface roughness was increased by increasing deposition time. Surface plasmon resonance peak-s red shift in optical absorption spectra of samples could be depends on silver nanoparticles- scale up. Based on electrical measurements, electrical percolation threshold was observed only in the film with 35 min deposition time. Pathway was created for electric current by Ag nanoparticles- moving in carbon matrix due to sp3 bonds and silver content in the films. The aging effect was studied for sample #2 in the threshold of percolation, where obtained Ag nanoparticles memorize its previous pathway. This investigation provides a better understanding for electric properties of Ag-DLC nanocomposite based on the percolation theory.

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