Thermal diffusivity of nonfractal and fractal nickel nanowires

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dc.contributor.authorRazeeb, Kafil M.
dc.contributor.authorRoy, Saibal
dc.contributor.funderEnterprise Ireland
dc.contributor.funderScience Foundation Ireland
dc.date.accessioned2017-07-12T09:07:45Z
dc.date.available2017-07-12T09:07:45Z
dc.date.issued2008-04-21
dc.description.abstractThe potential of using nanometallic wires inside a matrix as new generation of thermal interface material led us to study the thermal diffusivity of nickel nanowires embedded inside porous alumina template. Thermal diffusivity measurements using a laser flash method showed size dependence for nickel nanowires inside nanochannel alumina (NCA) templates having nominal pore diameters of 200, 100, and 20 nm. Nickel nanowires embedded inside these templates showed decreasing diffusivity values of 10.7x10(-6), 8.5x10(-6), and 6.5x10(-6) m(2) s(-1) at 300 K with decreasing wire diameter when deposited at 40 degrees C. Nanowires fabricated at 60 degrees C showed similar decreasing diffusivity with wire diameter, and a further 42%-48% reduction was observed when compared to 40 degrees C samples. The modified effective medium theory (MEMT) was employed to evaluate the experimental thermal diffusivity. Calculations based on MEMT resulted in mean thermal conductivities of 70.7 and 36.2 W m(-1) K(-1) for nickel nanowires fabricated at 40 and 60 degrees C respectively. These values are similar to 20% and 60% lower than the thermal conductivity value of bulk nickel. A strong grain size dependence of thermal diffusivity in the nanowires was observed. It is believed that the decrease in diffusivity in lower temperature wires is associated with defects/dislocations in large single crystals and reduction in wire diameters according to pore diameters of NCA. Whereas in higher temperature wires, the drastic reduction in diffusivity is believed to arise from self-similar fractal morphology composed of nanogranules, close to the dimension of electron mean free path.en
dc.description.sponsorshipEnterprise Ireland (Industry Led Research Programme (No. ILRP/05/PEIG/7)); Science Foundation Ireland (06/IN.1/ I98)en
dc.description.statusPeer revieweden
dc.description.versionPublished Versionen
dc.format.mimetypeapplication/pdfen
dc.identifier.articleid84302
dc.identifier.citationRazeeb, K. M. and Roy, S. (2008) 'Thermal diffusivity of nonfractal and fractal nickel nanowires', Journal of Applied Physics, 103(8), pp. 084302. doi: 10.1063/1.2906347en
dc.identifier.doi10.1063/1.2906347
dc.identifier.endpage7
dc.identifier.issn0021-8979
dc.identifier.issued8
dc.identifier.journaltitleJournal of Applied Physicsen
dc.identifier.startpage1
dc.identifier.urihttps://hdl.handle.net/10468/4226
dc.identifier.volume103
dc.language.isoenen
dc.publisherAIP Publishingen
dc.relation.urihttp://aip.scitation.org/doi/abs/10.1063/1.2906347
dc.rights© 2008 American Institute of Physics, This article may be downloaded for personal use only. Any other use requires prior permission of the author and AIP Publishing. The following article appeared in Razeeb, K. M. and Roy, S. (2008) 'Thermal diffusivity of nonfractal and fractal nickel nanowires', Journal of Applied Physics, 103(8), pp. 084302 and may be found at http://aip.scitation.org/doi/abs/10.1063/1.2906347en
dc.subjectExchanged oxide glassesen
dc.subjectConductivityen
dc.subjectSilveren
dc.subjectNickelen
dc.subjectNanowiresen
dc.subjectThermal diffusionen
dc.subjectThermal conductivityen
dc.subjectNanofabricationen
dc.titleThermal diffusivity of nonfractal and fractal nickel nanowiresen
dc.typeArticle (peer-reviewed)en
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