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Debye temperature of metallic nanowires - An experimental determination from the resistance of metallic nanowires in the temperature range 4.2 K-300K

Bid, Aveek and Bora, Achyut and Raychaudhuri, A. K. (2007) Debye temperature of metallic nanowires - An experimental determination from the resistance of metallic nanowires in the temperature range 4.2 K-300K. JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY, 7 (6). pp. 1867-1870. ISSN 1533-4880

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Abstract

We have studied the resistance of metallic nanowires (silver and copper) as a function of the wire diameter in the temperature range 4.2 K-300 K. The nanowires with an average diameter of 15 nm-200 nm and length 6 μm were electrochemically deposited using polycarbonate membranes as template from AgNO3 and CuSO4, respectively. The wires after growth were removed from the membranes by dissolving the polymer in dichloromethane and their crystalline nature confirmed by XRD and TEM studies. The TEM study establishes that the nanowires are single crystalline and can have twin in them. The resistivity data was fitted to Bloch-Gruneisen theorem with the values of Debye temperature and the electron-acoustic phonon coupling constant as the two fit variables. The value of the Debye temperature obtained for the Ag wires was seen to match well with that of the bulk while for Cu wires a significant reduction was observed. The observed increase in resistivity with a decrease in the wire diameter could be explained as due to diffuse surface scattering of the conduction electrons.

Item Type:Article
Subjects:Material Science > Functional and hybrid materials
Physical Science > Nanoelectronics
Material Science > Nanostructured materials
Divisions:Faculty of Engineering, Science and Mathematics > School of Physics
Faculty of Engineering, Science and Mathematics > School of Chemistry
ID Code:3914
Deposited By:JNCASR
Deposited On:27 Jan 2009 04:10
Last Modified:18 Apr 2009 10:09

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