Fabrication and Magnetotransport Properties of Carbon Films with Embedded Metal Nanoclusters

V.K. Ksenevicha, I.A. Bashmakovb, A.A. Melnikovc and A.D. Wieckc aLaboratory of Physics of Electronic Materials, Department of Physics, Belarus State University, F. Skaryna av. 4, 220050 Minsk, Belarus bDepartment of Chemistry, Belarus State University, F. Skaryna av. 4, 220050 Minsk, Belarus cDepartment of Physics and Astronomy, Bochum Ruhr-University, Universitaetstr., 150, 44780 Bochum, Germany

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Received: 22 08 2004;

2-dimensional arrays of Co- and Pd-clusters embedded in carbon films were fabricated by means of heat-treatment method of carboxylated cellulose films after the exchange of COOH-group protons by Co- and Pd-cations. The sizes of metal clusters within range 10 nm-1μm were obtained in dependence on the heat-treatment temperature. The dependencies of the resistance on temperature and magnetic field for the samples annealed at T=700ºC and 900ºC were measured. The R(T) dependencies both for carbon films with Co- and Pd-clusters can be fitted by expression R=R0 exp(T0/T)1/n inherent for variable-range hopping. In the whole range of investigated magnetic field and temperature magnetoresistance was negative and can be related to quantum interference in the variable range hopping transport along neighboring alternative paths.

DOI: 10.12693/APhysPolA.107.356 PACS numbers:61.46.+w, 73.63.-b, 75.47.-m