title: Electrical and optical percolations of polystyrene latex-multiwalled carbon nanotube composites.
abstract: Electrical conductivity and optical transmittance properties of polystyrene (PS)-multiwalled carbon nanotube (MWCNT) composite films were investigated. Composite films were prepared by mixing of various mass fractions of MWCNT in PS-water dispersions. After water evaporates, powder composite films were annealed at 175 degrees C above the glass transition of PS for 20 min. Photon transmission and two point probe resistivity techniques were employed to determine the variations of the optical and the electrical properties of composites. Transmitted light intensity, I(tr) and surface resistivity, R(s) were monitored as a function of MWCNT mass fraction (M). It was observed that, both the surface resistivity and the optical transparency were decreased by increasing the amount of MWCNT added to the polymeric system. Conductivity and optical results were interpreted according to the classical and site percolation theory, respectively. The electrical (sigma) and the optical (op) percolation threshold values and critical exponents were calculated as M(sigma)=1.8 wt.%, M(op)=0-0.13 wt.% and beta(sigma)=2.25, beta(op)=0.32, respectively.
authors.affiliation: Department of Physics, Trakya University, 22030 Edirne, Turkey. skara@trakya.edu.tr
authors.forename: Selim
authors.initials: S
authors.lastname: Kara
authors.forename: Ertan
authors.initials: E
authors.lastname: Arda
authors.forename: Fahrettin
authors.initials: F
authors.lastname: Dolastir
authors.forename: Onder
authors.initials: O
authors.lastname: Pekcan
mesh_terms: D004553:Electric Conductivity; D008567:Membranes, Artificial; D037742:Nanotubes, Carbon / Q000737:chemistry*; D055095:Optics and Photonics; D010316:Particle Size; D011137:Polystyrenes / Q000737:chemistry*; D013499:Surface Properties
chemical_list: D008567:Membranes, Artificial; D037742:Nanotubes, Carbon; D011137:Polystyrenes