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Effect of Neutron Exposure on Transport of Charge Carriers in Poly-Crystalline Cu Nanowires

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In the present work, the effect of neutron exposure on the electrical conductivity of 100 nm Cu nanowires (prepared by technique of electrodeposition using track-etched membranes) has been observed. In the different cases of neutron exposure to nanowires, the electrical conductivity initially remains less then pristine case, but exceeds when current through nanowire approaches 1 A. Though the electrical conductivity is found to increase in a linear manner with increase in applied potential difference, but the rate of increase is different for different exposure to neutrons. Neutrons induced modifications in the properties of a grain may be significant for parabolic nature of I–V characteristics (IVC), which follow a linear pattern (Ohm's law) before their exposure to neutrons. Transport of charge carriers through nanowires is the result of two competitive processes- specular and diffusive scattering of charge carriers (electrons) from grain boundaries, which is a region of high resistance than intra-grain regions. The flow of charge carriers in nanowires has been discussed in light of Mayadas and Shatzkes (MS) model with a slight modification for neutron exposed poly-crystalline Cu nanowires.
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Keywords: ELECTRICAL CONDUCTIVITY; GRAIN-BOUNDARY SCATTERING; NEUTRON EXPOSURE; POLYNOMIAL FITTING; REFLECTION COEFFICIENT

Document Type: Research Article

Publication date: November 1, 2012

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  • Science of Advanced Materials (SAM) is an interdisciplinary peer-reviewed journal consolidating research activities in all aspects of advanced materials in the fields of science, engineering and medicine into a single and unique reference source. SAM provides the means for materials scientists, chemists, physicists, biologists, engineers, ceramicists, metallurgists, theoreticians and technocrats to publish original research articles as reviews with author's photo and short biography, full research articles and communications of important new scientific and technological findings, encompassing the fundamental and applied research in all latest aspects of advanced materials.
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