Thermal and Thermoelectric Properties of Graphene

Xu, Yong; Li, Zuanyi; Duan, Wenhui

doi:10.1002/smll.201303701

Cited by 267 publications

(207 citation statements)

References 236 publications

(741 reference statements)

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“…For example, it is known that the effective j for both SWNTs and graphene depends on their length when it is comparable to the phonon mean free path. 25,32 The metallic SWNTs are shorter ($0.5 lm) and potentially more damaged than the semiconducting or purified SWNTs ($1 lm) after the sorting process, which is consistent with the observed lower overall j for the metallic SWNT films.…”

supporting

confidence: 79%

Thermal conductivity of chirality-sorted carbon nanotube networks

Lian

Llinas

et al. 2016

Applied Physics Letters

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The thermal properties of single-walled carbon nanotubes (SWNTs) are of significant interest, yet their dependence on SWNT chirality has been, until now, not explored experimentally. Here we used electrical heating and infrared thermal imaging to simultaneously study thermal and electrical transport in chirality-sorted SWNT networks. We examined solution processed 90% semiconducting, 90% metallic, purified unsorted (66% semiconducting), and as-grown HiPco SWNT films.The thermal conductivities of these films range from 80 to 370 Wm -1 K -1 but are not controlled by chirality, instead being dependent on the morphology (i.e. mass and junction density, quasi-alignment) of the networks. The upper range of the thermal conductivities measured is comparable to that of the best metals (Cu and Ag) but with over an order of magnitude lower mass density. This study reveals important factors controlling the thermal properties of light-weight chirality-sorted SWNT films, for potential thermal and thermoelectric applications.

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confidence: 79%

Thermal conductivity of chirality-sorted carbon nanotube networks

Lian

Llinas

et al. 2016

Applied Physics Letters

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“…(13), is expected to dominate over the first contribution, we use the identity p,p = N d d ν( )ν( ), where ν( ) is the density of states per spin per valley and N = 4 is the spin and valley degeneracy, assuming unit area. The energy conservation δ function can be used to evaluate one of the integrals, while the other integral can be evaluated by using the quasielastic approximation: …”

Section: Cooling Powermentioning

confidence: 99%

Resonant electron-lattice cooling in graphene

et al. 2018

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Controlling energy flows in solids through switchable electron-lattice cooling can grant access to a range of interesting and potentially useful energy transport phenomena. Here we discuss a tunable electron-lattice cooling mechanism arising in graphene due to phonon emission mediated by resonant scattering on defects in a crystal lattice, which displays an interesting analogy to the Purcell effect in optics. In that, the electron-phonon cooling rate is enhanced due to hot carrier trapping at resonant defects. Resonant dependence of this process on carrier energy translates into gate-tunable cooling rates, exhibiting strong enhancement of cooling that occurs when the carrier energy is aligned with the electron resonance of the defect.

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“…the coherent effect of successive scatterings is not important [44,45] . M (E) is determined by the electronic band structure and T (E) is related to scattering.…”

Section: λ(E) or The Scattering Time τ (E) T (E) = λ(E)/[λ(e) + L] Imentioning

confidence: 99%

Thermoelectric effects and topological insulators

2016

Chinese Phys. B

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The recent discovery of topological insulator (TI) offers new opportunities for the development of thermoelectrics, because many TIs (like Bi2Te3) are excellent thermoelectric (TE) materials. In this review, we will first describe the general TE properties of TIs and show that the coexistence of the bulk and boundary states in TIs introduces unusual TE properties, including strong size effects and anomalous Seebeck effect.Importantly, the TE figure of merit zT of TIs is no longer an intrinsic property, but depends strongly on the geometric size. The geometric parameters of two-dimensional TIs can be tuned to enhance zT to be significantly greater than 1. Then a few proof-of-principle experiments on three-dimensional TIs will be discussed, which observed unconventional TE phenomena that are closely related to the topological nature of the materials. However, current experiments indicate that the metallic surface states, if their advantage of high mobility is not fully utilized, would be detrimental to TE performance. Finally we provide an outlook for future work on topological materials, which offers great possibilities to discover exotic TE effects and may lead to significant breakthroughs in improving zT .

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Thermal and Thermoelectric Properties of Graphene

Cited by 267 publications

References 236 publications

Thermal conductivity of chirality-sorted carbon nanotube networks

Thermal conductivity of chirality-sorted carbon nanotube networks

Resonant electron-lattice cooling in graphene

Thermoelectric effects and topological insulators

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