Tuning Phonon Transport: From Interfaces to Nanostructures

Le, Nam Q.; Baker, Christopher H.

doi:10.1115/1.4023584

Cited by 44 publications

(37 citation statements)

References 77 publications

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“…The reduction in thermal conductivity for the TiO 2 -based SL is in line with the results reported for the (ZnO) x /HQ SLs. This reduction in the thermal conductivity due to the periodic monolayers is consistent with the decrease in thermal conductivity with increased interface density in inorganic SLs [45,46].…”

Section: Resultssupporting

confidence: 77%

“…As pointed out in purely inorganic SLs, the monotonic decrease in thermal conductivity due to increased interface density (and linearly increasing thermal resistance with increasing interface density) is due to incoherent scattering, where the phonons behave as particles and lose their phase information by scattering at the internal boundaries [45,46].…”

Section: Resultsmentioning

confidence: 80%

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Heat-transport mechanisms in molecular building blocks of inorganic/organic hybrid superlattices

et al. 2016

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Nanomaterial interfaces and concomitant thermal resistances are generally considered as atomic-scale planes that scatter the fundamental energy carriers. Given that the nanoscale structural and chemical properties of solid interfaces can strongly influence this thermal boundary conductance, the ballistic and diffusive nature of phonon transport along with the corresponding phonon wavelengths can affect how energy is scattered and transmitted across an interfacial region between two materials. In hybrid composites composed of atomic layer building blocks of inorganic and organic constituents, the varying interaction between the phononic spectrum in the inorganic crystals and vibronic modes in the molecular films can provide a new avenue to manipulate the energy exchange between the fundamental vibrational energy carriers across interfaces. Here, we systematically study the heat transfer mechanisms in hybrid superlattices of atomic-and molecular-layer-grown zinc oxide and hydroquinone with varying thicknesses of the inorganic and organic layers in the superlattices. We demonstrate ballistic energy transfer of phonons in the zinc oxide that is limited by scattering at the zinc oxide/hydroquinone interface for superlattices with a single monolayer of hydroquinone separating the thicker inorganic layers. The concomitant thermal boundary conductance across the zinc oxide interfacial region approaches the maximal thermal boundary conductance of a zinc oxide phonon flux, indicative of the contribution of long wavelength vibrations across the aromatic molecular monolayers in transmitting energy across the interface. This transmission of energy across the molecular interface decreases considerably as the thickness of the organic layers are increased.

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Section: Resultssupporting

confidence: 77%

Section: Resultsmentioning

confidence: 80%

Heat-transport mechanisms in molecular building blocks of inorganic/organic hybrid superlattices

et al. 2016

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“…In many literatures, it has been confirmed that the interface in the composites play a significant role in their thermal conductivity [236][237][238][239][240][241]. Heat transfer at the interface of two different materials mostly happens with a temperature discontinuity [242].…”

Section: Thermal Conductivitymentioning

confidence: 99%

“…This phenomenon was observed first at the interface of a metal and liquid helium [243], while later it has been found at the interface of two solids [244]. The heat loss at the interface of two different materials is due to the phonon scattering at this region [236,238,239]. Phonon scattering can be significantly impacted by dimensions of fillers, the matrix, and their interfacial regions.…”

Section: Thermal Conductivitymentioning

confidence: 99%

“…The thermal boundary conductance, which is the inverse of the interfacial thermal resistance, was studied first by Kapitza in 1941 [243]. The effects of interfacial phonons transport are merged into this factor [238]. Although in macroscopic scale k is the controlling parameter for heat flux, it is strongly affected by h BD at nanoscale [266,267].…”

Section: Thermal Conductivitymentioning

confidence: 99%

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A review on the role of interface in mechanical, thermal, and electrical properties of polymer composites

Kashfipour

Mehra

Zhu

2018

Adv Compos Hybrid Mater

176

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Composite materials and especially polymer composites are widely used in daily life and different industries due to their vastly different properties and design flexibility. It is known that the properties of the composites are strongly related to the properties of its constituents. However, it has been reported in many studies, experimentally and by simulations, that the characteristics of the composites do not follow the rule of mixing. It means that in addition to properties of the constituents, there are other parameters affecting the final physicochemical properties of composites. The interfacial interactions between fillers and host is one of the factors which can strongly affect the properties of the composite. In this review, we summarized the type of interactions between the constituents, their improvement techniques, interaction measurement methods, and the effects of interfacial interactions on thermal, mechanical, and electrical properties of composites.

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Thermal Conductivity Reduction at Inorganic–Organic Interfaces: From Regular Superlattices to Irregular Gradient Layer Sequences

Krahl

Giri

Tomko

et al. 2018

Adv Materials Inter

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been made by introducing disorder in the systems via alloying, complex crystal-engineering, [4,5] and by creating interfaces in thin films. [2] Hicks and Dresselhaus originally proposed that quantum well structures should be capable of lowering the thermal conductivity with only a minor impact on the electrical conductivity; [6] note that the latter point is particularly important for the application in thermoelectrics. Experimentally the phenomenon has been demonstrated, e.g., by Hicks et al. [7] in the PbTe/(Pb,Eu)Te system and by Ohta et al. [8] in the SrTiO 3 /Sr(Ti,Nb)O 3 system. Layered structures that show reduced thermal conductivity have been reported for a number of other material systems as well, such as CaTiO 3 /SrTiO 3 , [9] W/ Al 2 O 3 , [10] PbTe/PbSe, [11] IrSb 3 /CoSb 3 , [12] AlN/GaN, [13] TiNiSn/ HfNiSn, [14] Si/Ge (including alloy variants), [15][16][17][18][19] GaAs/AlAs (including alloy variants), [20][21][22][23] Bi 2 Te 3 /Sb 2 Te 3 , [24] InAs/AlSb, [25] InGaAs/InGaAsP, [26] and Ge 2 Te 3 /Sb 2 Te 3 , [27] to name a few. Most such inorganic-inorganic interfaces utilize isoelectronic substitution to retain the electrical conductivity and the high degree of crystallinity of the samples, which essentially grow epitaxially. An exception are the crystalline-amorphous interfaces as reported, e.g., in the Al 2 O 3 /TiO 2 [28] and Si [29] systems. With regard to high-quality interfaces, inorganic-organic superlattices offer an attractive option to reduce thermal conductivity compared to a homogeneous inorganic thin film. Owing to the large acoustic impedances between the inorganic and organic materials, we may anticipate considerably lowered thermal boundary conductance across the inorganic-organic interface. [30] Remarkable results have been reported for, e.g., TiS 2 with organic molecules intercalated either electrochemically [31] or chemically [32] from an organic solution. We have, on the other hand, fabricated ZnO/benzene [33,34] and TiO 2 /benzene [35,36] superlattices using the gas-phase atomic/molecular layer deposition (ALD/MLD) thin-film technique to demonstrate reductions in thermal conductivity of several orders of magnitude. Among the benefits of the ALD/MLD technique over solution-based intercalation routes is that it allows the precise control of the introduction frequency of the organic layers within the inorganic matrix.The uniting concept to lower the thermal conductivity of superlattice and nanolaminate structures is to suppress phonon Nanoscale superlattice structures are known to significantly suppress the thermal conductivity in thin films due to phonon scattering at the interfaces of the mutually different layers. Here it is demonstrated that in addition to the number of interfaces, their spacing within the film can lead to a reduction in thermal conductivity. The proof-of-concept data are for ZnO/benzene thin films fabricated through sequential gas-surface reactions in atomic/ molecular layer precision using the atomic/molecular layer deposition technique. In comparison to...

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Tuning Phonon Transport: From Interfaces to Nanostructures

Cited by 44 publications

References 77 publications

Heat-transport mechanisms in molecular building blocks of inorganic/organic hybrid superlattices

Heat-transport mechanisms in molecular building blocks of inorganic/organic hybrid superlattices

A review on the role of interface in mechanical, thermal, and electrical properties of polymer composites

Thermal Conductivity Reduction at Inorganic–Organic Interfaces: From Regular Superlattices to Irregular Gradient Layer Sequences

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