The electrical conductivity of poly-p-xylylene + CdS nanocomposites |
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Authors: | I A Misurkin S V Titov T S Zhuravleva I V Klimenko S A Zav’yalov E I Grigor’ev and S N Chvalun |
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Institution: | (1) Karpov Research Institute of Physical Chemistry, ul. Vorontsovo pole 10, Moscow, 105064, Russia;(2) Emanuel Institute of Biochemical Physics, Russian Academy of Sciences, ul. Kosygina 4, Moscow, 117977, Russia |
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Abstract: | The dependence of electrical conductivity on the concentration of CdS (c) and temperature (T) over the temperature range 10–300 K was studied for poly-p-xylylene-CdS (PPX + CdS) nanocomposites prepared by solid-state cryochemical synthesis. The results were discussed in terms
of the heterogeneous conductivity model including various charge transfer mechanisms in various nanocomposite regions. Under
the illumination of a film with c > 11 vol % by a daylight lamp, the conductivity increased, and the σ(T) dependence was metallic in character at low temperatures. The photoconductivity of films at larger concentrations c was caused by the appearance of photoexcited electrons in CdS nanoparticles, the separation of charges at the nanoparticle-matrix
boundary, and percolation effects in films. The PPX matrix was shown to actively participate in electrical conductivity; electrons
in this matrix jumped between phenyl rings. The experimental dependence of dark conductivity σ(T) at temperatures from 150 to 300 K was analyzed using the Mott hopping conductivity model with variable jump lengths. The
main points of the Mott theory of hopping conductivity were discussed.
Original Russian Text ? I.A. Misurkin, S.V. Titov, T.S. Zhuravleva, I.V. Klimenko, S.A. Zav’yalov, E.I. Grigor’ev, S.N. Chvalun,
2009, published in Zhurnal Fizicheskoi Khimii, 2009, Vol. 83, No. 3, pp. 534–540. |
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