Influence of grain boundary scattering on the electrical and thermal conductivities of polycrystalline gold nanofilms

Zhang, Q. G.; Cao, Bing‐Yang; Zhang, X.; Fujii, Minoru; Takahashi, Kazuhiko

doi:10.1103/physrevb.74.134109

Cited by 138 publications

(148 citation statements)

References 18 publications

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“…This kind of phenomenon also has been observed in gold and platinum nanofilms, 4,19,20 nickel nanowire 21 and alloys 22 . The reduced thermal conductivity was attributed to the increased scatterings of heat carriers from structural imperfection and the contribution of phonon thermal conductivity.…”

Section: B Thermal Conductivity and Unified Thermal Resistivity Of Tmentioning

confidence: 77%

Temperature dependent behavior of thermal conductivity of sub-5 nm Ir film: Defect-electron scattering quantified by residual thermal resistivity

Cheng

et al. 2015

Journal of Applied Physics

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By studying the temperature-dependent behavior (300 K down to 43 K) of electron thermal conductivity () in a 3.2 nm-thin Ir film, we quantify the extremely confined defect-electron scatterings and isolate the intrinsic phonon-electron scattering that is shared by the bulk Ir. At low temperatures below 50 K,  of the film has almost two orders of magnitude reduction from that of bulk Ir. The film has ∂/∂T>0 while the bulk Ir has ∂/∂T <0. We introduce a unified thermal resistivity (=T/) to interpret these completely different ~T relations. It is found that the film and the bulk Ir share a very similar ~T trend while they have a different residual part (Θ 0 ) at 0 K limit:  0~0 for the bulk Ir, and  0 =5.5 mK 2 /W for the film. The Ir film and the bulk Ir have very close ∂Θ/∂T (75 to 290 K): 6.33×10 -3 mK/W for the film and 7.62×10 -3 mK/W for the bulk Ir. This strongly confirms the similar phonon-electron scattering in them. Therefore, the residual thermal resistivity provides an unprecedented way to quantitatively evaluating defectelectron scattering ( 0 ) in heat conduction. Moreover, the interfacial thermal conductance across the grain boundaries is found larger than that of Al/Cu interface, and its value is proportional to a Corresponding author. Email: xwang3@iastate.edu, Tel: 515-294-2085, Fax: 515-294-3261 2 temperature, largely due to the electron's specific heat. A unified interfacial thermal conductance is also defined and firmly proves this relation. Additionally, the electron reflection coefficient is found to be large (88%) and almost temperature independent.3

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Section: B Thermal Conductivity and Unified Thermal Resistivity Of Tmentioning

confidence: 77%

Temperature dependent behavior of thermal conductivity of sub-5 nm Ir film: Defect-electron scattering quantified by residual thermal resistivity

Cheng

et al. 2015

Journal of Applied Physics

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“…Comparison of the present electron-phonon coupling factor with the results obtained in Ref. [27] for different film thickness.…”

Section: Thermophysical Propertiesmentioning

confidence: 80%

“…Moreover, Ref. [27] also revealed the temperature-dependence of film thermal conductivity. For instance, when temperature increases from 80 K to 300 K, the heat conductivity would be much enhanced.…”

Section: Resultsmentioning

confidence: 99%

“…Recently Ref. [27] found that the reduction of thermal conductivities of polycrystalline Au nanofilms arose from large reflection coefficient of electrons on grain boundary which was found 0.7 or so. Hence, the effect of grain boundary scattering causes the heat conductivity of Au nanofilms to decrease one order of magnitude compared with the conductivity of Au bulk.…”

Section: Resultsmentioning

confidence: 99%

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Investigation of thermomechanical responses in ultrafast laser heating of metal nanofilms

Zhou

2011

Thin Solid Films

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The present work uses two-temperature model and Cattaneo's constitutive model to study the thermomechanical responses and the size effect on energy transport during ultrafast laser heating of Au nanofilms. It is shown that the grain size effects on thermophysical properties, heat transport and thermal stresses are rather evident when the average grain diameter is less than the electron mean free path. The study on heat transport shows that there are two heat waves propagating in the lattice during nonequilibrium heating of films. It is found that the classical thermoelastic theory can not reveal the generation of the ultrafast thermal stresses during nonequilibrium heating; however, it can approximately describe the stress evolution in the stage of thermal equilibrium.

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“…21) (White & Wood, 1959). The phenomena of the metallic electrical resistivity and decreasing thermal conductivity have been observed in disordered metallic systems of thin films, concentrated alloys and superlattices (Zhou et al, 2006;Zhang et al, 2006;Yang et al, 2006;Berman, 1976). Such behavior was explained by increased scattering of heat carrier with the structural defects and by the substantial contribution of the phonon thermal conductivity.…”

Section: Specific Heat Electrical and Thermal Conductivity Measuremementioning

confidence: 99%

Fabrication, Characterization and Thermal Properties of Nanowires

Chen¹,

Chen²,

Lee³

et al. 2011

Nanowires - Fundamental Research

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Influence of grain boundary scattering on the electrical and thermal conductivities of polycrystalline gold nanofilms

Cited by 138 publications

References 18 publications

Temperature dependent behavior of thermal conductivity of sub-5 nm Ir film: Defect-electron scattering quantified by residual thermal resistivity

Temperature dependent behavior of thermal conductivity of sub-5 nm Ir film: Defect-electron scattering quantified by residual thermal resistivity

Investigation of thermomechanical responses in ultrafast laser heating of metal nanofilms

Fabrication, Characterization and Thermal Properties of Nanowires

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