Direct measurement of thermal conductivity of aluminum nanowires

Stojanović, Nenad; Berg, Jordan M.; Maithripala, D. H. S.; Holtz, M.

doi:10.1063/1.3216035

Cited by 42 publications

(44 citation statements)

References 17 publications

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“…͑3͒ and ͑6͒ to direct measurements of for rectangular Al nanowires. 16 The thickness in each case is reported to be 100 nm, and the width varied from 75 to 150 nm. Grain sizes are estimated from scanning electron microscope ͑SEM͒ images of the nanowires.…”

Section: Results For Nanowires Nanoribbons and Thin Filmsmentioning

confidence: 99%

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Thermal conductivity in metallic nanostructures at high temperature: Electrons, phonons, and the Wiedemann-Franz law

et al. 2010

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The Boltzmann transport equation is used to calculate thermal and electrical conductivity of metal nanostructures with characteristic dimensions in the 25-500 nm range, near to and above the Debye temperature. Thermal conductivity contributions from phonons and electrons are considered. The intrinsic effects of electron-phonon, phonon-phonon, and phonon-electron scattering, and grain boundary and surface interactions are addressed. Excellent agreement is found between model results and available data reporting direct measurements of thermal conductivity of nanowires, ribbons, and thin films in Al, Pt, and Cu, respectively. The Wiedemann-Franz ͑W-F͒ law and Lorenz factor are examined with decreasing size; their applicability is found to degrade in nanowires due mainly to increased relative phonon contribution. The effect of differences in the electron mean-free path for thermal gradient versus electrical field is also examined. A modified version of W-F is presented, corrected for these two factors and valid from macroscale to nanoscale provided characteristic sizes exceed the phonon mean-free path.

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Section: Results For Nanowires Nanoribbons and Thin Filmsmentioning

confidence: 99%

“…This agrees with results of recent experiments on Al nanowires. 16 The reduction in e is attributed to e being greater than ph , a situation that generally holds in metals. The resulting large reduction in e relative to ph suggests that the practice of neglecting ph in metals must be revisited at the nanoscale.…”

Section: Introductionmentioning

confidence: 98%

Thermal conductivity in metallic nanostructures at high temperature: Electrons, phonons, and the Wiedemann-Franz law

et al. 2010

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“…However, all peaks in the sample which was grown in 6 h were shifted to higher BE compared to that other samples. It might be due to the excitation of electron-hole-pair states, namely, interactions of the Fermi-gas conduction electrons with holes caused by the absorption of X-rays by the core electrons [31].The intensity of W4f 7/2 of W4f core level varied and drastically increased at 6 h of growth time. The peak at 41.7 eV was assigned to W5p.…”

Section: X-ray Photoelectron Spectroscopymentioning

confidence: 99%

“…By increasing the growth time, the conductivity of the sample increases, this may be due to an increase in the number of nanowires on the sample surface which increases the available free charge carriers. On the other hand, based on experimental results [30][31][32]35], it was found that the number and size of nanowires have apparent influence on the electrical properties, which is in good agreement with the theoretical models [33,34]. For studying the electrical conductivity in nanostructures, based on the Matthiessen's and Bloch-Grü-neisen theory [34], the electrical resistivity depends on two factors: (1) the residual resistivity (due to structural scatterings caused by grain boundary, impurity and surface).…”

Section: Sem Analysismentioning

confidence: 99%

Effect of growth time on structural, morphological and electrical properties of tungsten oxide nanowire

et al. 2018

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In this work, tungsten oxide nanowires were grown directly on a tungsten substrate in 800 °C using thermal evaporation method in a horizontal tube furnace. The effect of growth time on structural, morphological, elemental composition and electrical properties of the tungsten oxide nanostructures was investigated using X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), X-ray photoelectron spectroscopy (XPS) technique and KIETHLEY 2361 system. Our experimental results show that tungsten oxide nanowires crystalline phase, electrical conductance and density on the substrate surface depend on the growth time. The XRD results showed that tungsten oxide nanowires are synthesized with a cubic WO 3 structure. Moreover, the lattice strain, grain size and dislocation density were obtained in three different growth time. It is noteworthy that by increasing the growth time the crystallinity increases. The FESEM images at different growth times showed that the nanowires on grains begin to germinate when the growth time increases to 6 h. At this time, nanowire structures with 1 µm in diameter and 40 µm in length were formed and continued to grow which caused a change in the morphology. In addition, the XPS results showed that the sample that has grown at longer growth time exhibit two asymmetric W4d5/2 and W4d3/2 peak at 252 and 263 eV which can be assigned to W5+ and W4+ species, respectively. Moreover, the linear I-V curves are obtained and it is found that by increasing the growth time, the conductivity of the sample increases due to increasing number of wires on the sample surface. Finally, the conditions and mechanism of WO 3 nanowire growth are discussed. The results can be used to guide a better understanding about the growth behavior of WO 3 nanowires and can contribute towards the development of novel nanodevices.

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“…Due to their very high potential applications, considerable research has been performed to compute the thermal and mechanical properties of metallic and semiconducting nanowires . For instance, Stojanovic and cooperators measured the thermal conductivity of aluminium nanowires near room temperature directly [5]. Furthermore, Li Hui et al showed that the thermal stability of nickel nanowire was dependent on the structure and size of the nanowire and that the melting was not only due to the single atom's diffusion, but also the diffusion of the local clusters [6].…”

Section: Introductionmentioning

confidence: 99%

Molecular dynamics simulations of the melting of Al–Ni nanowires

Davoodi

Dadashi

Yarifard

2016

Philosophical Magazine

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Molecular dynamics (MD) simulations were performed to investigate the influence of nickel (Ni) composition and nanowire thickness on the thermal properties of Al-x%Ni (at%) nanowires using the embedded atom model (EAM) potential. The melting of the nanowire was characterised by studying the temperature dependence of the cohesive energy and mean square displacement. The effect of the nanowire thickness on the cohesive energy, melting temperature, heat capacity as well as latent heat was studied in canonical ensemble. Moreover, the crystal stability of Al, Al-20%Ni, Al-40%Ni, Al-60%Ni, Al-80%Ni, Al 3 Ni, Ni 3 Al and Ni nanowires was studied at different temperatures using mean square displacement and cohesive energy.

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Direct measurement of thermal conductivity of aluminum nanowires

Cited by 42 publications

References 17 publications

Thermal conductivity in metallic nanostructures at high temperature: Electrons, phonons, and the Wiedemann-Franz law

Thermal conductivity in metallic nanostructures at high temperature: Electrons, phonons, and the Wiedemann-Franz law

Effect of growth time on structural, morphological and electrical properties of tungsten oxide nanowire

Molecular dynamics simulations of the melting of Al–Ni nanowires

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