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Metal-to-nonmetal transition in copper nanoshells grown on copper oxide nanoparticles

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4 Author(s)
Chatterjee, K. ; Indian Association for the Cultivation of Science, Kolkata-700 032, India ; Satpati, B. ; Satyam, P.V. ; Chakravorty, D.

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Copper oxide nanoparticles of median diameter 17 nm were synthesized by a chemical method. By subjecting these to a reduction treatment at 373 K for a duration extending to 1 h copper shells of thicknesses in the range 2–6.5 nm were grown. Optical absorption measurements were carried out on these core-shell structured nanosystems in the temperature range 274–343 K. Analyses of the data show that below a shell thickness of 3 nm the copper shell conductivity has a value below the Mott’s minimum metallic conductivity and shows a semiconducting behavior. Electrical conductivity measurements on pellets of the nanostructured powders show a resistivity variation at low temperatures with activation energies in satisfactory agreement with those obtained from the optical studies. © 2004 American Institute of Physics.

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Journal of Applied Physics  (Volume:96 ,  Issue: 1 )