Chatterjee, K. ; Satpati, B. ; Satyam, P. V. ; Chakravorty, D. (2004) Metal-to-nonmetal transition in copper nanoshells grown on copper oxide nanoparticles Journal of Applied Physics, 96 (1). pp. 683-687. ISSN 0021-8979
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Official URL: http://link.aip.org/link/?JAPIAU/96/683/1
Related URL: http://dx.doi.org/10.1063/1.1759075
Abstract
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.
| Item Type: | Article |
|---|---|
| Source: | Copyright of this article belongs to American Institute of Physics. |
| Keywords: | Copper; Copper Compounds; Semiconductor Materials; Nanoparticles; Reduction (Chemical); Absorption Coefficients; Electrical Conductivity; Metal-insulator Transition; Materials Preparation |
| ID Code: | 65050 |
| Deposited On: | 15 Oct 2011 12:18 |
| Last Modified: | 15 Oct 2011 12:18 |
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