Thermal conductivity of functionalized single-wall carbon nanotubes

Pan, Ruiqin; Xu, Zijian; Zhang, Zhu; Wang, Zhenxia

doi:10.1088/0957-4484/18/28/285704

Cited by 33 publications

(19 citation statements)

References 23 publications

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“…We show the power spectra of atoms close to the top and the bottom (4th and 37th layers, the heat baths are contacted at 2nd layer and 39th layer, respectively) in figure 4. The frequency range of the power spectrum is from 0 to 60 THz, which is consistent with the reported vibration spectra [15,[27][28][29] of carbon nanotubes. There is significant difference between nano and bulk material in the power spectra.…”

supporting

confidence: 88%

Carbon nanocone: A promising thermal rectifier

Yang

Zhang

2008

Applied Physics Letters

260

181

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With molecular dynamics simulations, we demonstrate that the carbon nanocone is an excellent thermal rectifier. Obvious thermal rectification ratio in large temperature range, from 200K to 400K, has been observed. Furthermore, the rectification of nanocone does not depend on the length very sensitively, which is in stark contrast with the nanotube thermal rectifier in which the rectification decreases dramatically as the length increases.In nanocone, the heat flux is controlled by match/mismatch of the phonon power spectra.Our work demonstrates that carbon nanocone is a promising practical phononic device.

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supporting

confidence: 88%

Carbon nanocone: A promising thermal rectifier

Yang

Zhang

2008

Applied Physics Letters

260

181

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“…15,16 Functional groups, interpreted as deliberately added structural defects, inevitably affect the phonon dynamics along the CNT symmetry axis, therefore lowers the through axis thermal conductivity. Although, the thermal conductivity of the functionalized CNT has been the subject of many phenomenological analysis, 12,17,18 it has not been studied in the language of phonon energy transmission. In this article, by studying the scattering of the lattice vibrations of well defined polarization and wave number due to different functional groups, we report on the single mode phonon energy transmission in functionalized CNTs and investigate how the mass and molecular chemistry of the functional group affect phonon scattering at the defect sites.…”

Section: Introductionmentioning

confidence: 99%

Single mode phonon energy transmission in functionalized carbon nanotubes

Lee

Varshney

Roy

et al. 2011

The Journal of Chemical Physics

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Although the carbon nanotube (CNT) features superior thermal properties in its pristine form, the chemical functionalization often required for many applications of CNT inevitably degrades the structural integrity and affects the transport of energy carriers. In this article, the effect of the side wall functionalization on the phonon energy transmission along the symmetry axis of CNT is studied using the phonon wave packet method. Three different functional groups are studied: methyl (-CH(3)), vinyl (-C(2)H(3)), and carboxyl (-COOH). We find that, near Γ point of the Brillouin zone, acoustic phonons show ideal transmission, while the transmission of the optical phonons is strongly suppressed. A positive correlation between the energy transmission coefficient and the phonon group velocity is observed for both acoustic and optical phonon modes. On comparing the transmission due to functional groups with equivalent point mass defects on CNT, we find that the chemistry of the functional group, rather than its molecular mass, has a dominant role in determining phonon scattering, hence the transmission, at the defect sites.

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“…Ansari et al [209] have reported that functionalization of SWCNTs caused chemisorption of atomic oxygen and -hydroxyl and reduces Young's modulus and critical strain while increases the critical force of CNTs. Thermal conductivity is also dropped by a factor of 1.5 after functionalization of CNTs [210]. Stability and thermal conductivity of F-CNTs is better explained by concentric functional group parameter presented in the nanotube [211].…”

Section: Properties Of Functionalized Cntsmentioning

confidence: 96%

Carbon Nanotubes (CNTs) from Synthesis to Functionalized (CNTs) Using Conventional and New Chemical Approaches

Salah

Ouslimani

Bousba

et al. 2021

Journal of Nanomaterials

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Carbon nanotubes (CNTs) have emerged worldwide because of their remarkable properties enlarging their field of applications. Functionalization of CNTs is a convenient strategy to tackle low dispersion and solubilization of CNTs in many solvents or polymers. It can be done by covalent or noncovalent surface functionalization that is briefly discussed regarding the current literature. Endohedral and exohedral are conventional methods based on covalent and van der Waals bonding forces that are created through CNT functionalization by various materials. In this paper, a review of new approaches and mechanisms of functionalization of CNTs is proposed, including amidation, fluorination, bromination, chlorination, hydrogenation, and electrophilic addition. Our analysis is supported by several characterization methods highlighting recent improvements hence extending the range of applicability of CNTs.

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Thermal conductivity of functionalized single-wall carbon nanotubes

Cited by 33 publications

References 23 publications

Carbon nanocone: A promising thermal rectifier

Carbon nanocone: A promising thermal rectifier

Single mode phonon energy transmission in functionalized carbon nanotubes

Carbon Nanotubes (CNTs) from Synthesis to Functionalized (CNTs) Using Conventional and New Chemical Approaches

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