Spectral properties of single-walled carbon nanotubes encapsulating fullerenes

Ryabenko, A. G.; Киселев, Н.А.; Hutchison, J. L.; Мороз, Т. Н.; Bukalov, S. S.; Mikhalitsyn, L. A.; Loutfy, Raouf O.; Moravsky, A. P.

doi:10.1016/j.carbon.2007.03.031

Cited by 22 publications

(25 citation statements)

References 43 publications

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“…Pimenta et al [20] reviewed the defect-induced Raman spectra of graphitic materials and presented Raman results on nanographites and graphenes. Ryabenko et al [21] analyzed the spectral properties of single-wall carbon nanotubes encapsulating fullerenes and found that fullerene alters the average diameter of the electron cloud around the single wall carbon nanotube. Michel et al [22] presented a unified theory of the phonon dispersion and elastic properties of graphene, graphite and graphene multilayer systems.…”

Section: Introductionmentioning

confidence: 99%

Vibrational properties of nanographene

Singh¹,

Peeters²

2013

Nanoscale Systems: Mathematical Modeling, Theory and Applications

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The eigenmodes and the vibrational density of states of the ground state configuration of graphene clusters are calculated using atomistic simulations. The modified Brenner potential is used to describe the carbon-carbon interaction and carbon-hydrogen interaction in case of H-passivated edges. For a given configuration of the C-atoms the eigenvectors and eigenfrequencies of the normal modes are obtained after diagonalisation of the dynamical matrix whose elements are the second derivative of the potential energy. The compressional and shear properties are obtained from the divergence and rotation of the velocity field. For symmetric and defective clusters with pentagon arrangement on the edge, the highest frequency modes are shear modes. The specific heat of the clusters is also calculated within the harmonic approximation and the convergence to the result for bulk graphene is investigated.

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Section: Introductionmentioning

confidence: 99%

Vibrational properties of nanographene

Singh¹,

Peeters²

2013

Nanoscale Systems: Mathematical Modeling, Theory and Applications

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“…For example C 60 @SWNT peapod bundles can have stronger van der Waals forces compared with C 70 @SWNT bundles as demonstrated by spectral characterisation. [158] Moreover, other higher order fullerenes also induced size-dependent electronic structure variation in peapods followed by van der Waals' disparity. [160] Furthermore, fullerene encapsulation may also result in increased mechanical strength of SWNTs, [161] resulting in stiffer tubules.…”

Section: Environmental Interaction Of Nanohybridsmentioning

confidence: 99%

“…Such conjugation exhibits bandgap tuning [157] and electron density differences. [158] Such alterations occur as a result of SWNT diameter changes upon conjugation as well as of the entrapment of fullerenes that causes overlap of electron clouds. [157,159] Peapod formation often involves SWNT oxidation in the presence of acid mixtures that forms surface defects and also causes shortening of the SWNT length.…”

Section: Environmental Interaction Of Nanohybridsmentioning

confidence: 99%

“…For example, nanopeapods mask the presence of zero-dimensional fullerenes [158] and two-dimensional graphene [163] inside one-dimensional CNTs; whereas their exohedral conjugation results in unique three-dimensional configurations. Covalently bonded fullerenes on the surface of the graphene [60] or CNTs [33] (in case of nanobuds) can have debundling or intercalating effects and can result in enhanced stability.…”

Section: Environmental Interaction Of Nanohybridsmentioning

confidence: 99%

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A critical review of nanohybrids: synthesis, applications and environmental implications

et al. 2014

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Environmental context. Recent developments in nanotechnology have focussed towards innovation and usage of multifunctional and superior hybrid nanomaterials. Possible exposure of these novel nanohybrids can lead to unpredicted environmental fate, transport, transformation and toxicity scenarios. Environmentally relevant emerging properties and potential environmental implications of these newer materials need to be systematically studied to prevent harmful effects towards the aquatic environment and ecology.Abstract. Nanomaterial synthesis and modification for applications have progressed to a great extent in the last decades. Manipulation of the physicochemical properties of a material at the nanoscale has been extensively performed to produce materials for novel applications. Controlling the size, shape, surface functionality, etc. has been key to successful implementation of nanomaterials in multidimensional usage for electronics, optics, biomedicine, drug delivery and green fuel technology. Recently, a focus has been on the conjugation of two or more nanomaterials to achieve increased multifunctionality as well as creating opportunities for next generation materials with enhanced performance. With incremental production and potential usage of such nanohybrids come the concerns about their ecological and environmental effects, which will be dictated by their not-yet-understood physicochemical properties. While environmental implication studies concerning the single materials are yet to give an integrated mechanistic understanding and predictability of their environmental fate and transport, the importance of studying the novel nanohybrids with their multidimensional and complex behaviour in environmental and biological exposure systems are immense. This article critically reviews the literature of nanohybrids and identifies potential environmental uncertainties of these emerging 'horizon materials'.

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“…Many groups have performed the Raman experiments of filling SWCNTs with C 60 or C 70 molecules [12,[42][43][44][45][46] since the first synthesized by Smith et al [4]. Figure 5 presents two examples of peapod experimental…”

Section: Raman Experiments On C 60 and C 70 Peapodsmentioning

confidence: 99%

Structural and Vibrational Properties of C60 and C70 Fullerenes Encapsulating Carbon Nanotubes

Chadli¹,

Fergani²,

Rahmani³

2018

Fullerenes and Relative Materials - Properties and Applications

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Carbon nanotubes (CNTs) can encapsulate small and large molecules, including C 60 and C 70 fullerenes (so-called carbon peapods). The challenge for nanotechnology is to achieve perfect control of nanoscale-related properties, which requires correlating the parameters of synthesis process with the resulting nanostructure. For that purpose, note every conventional characterization technique is suitable, but Raman spectroscopy has already proven to be. First, the different possible configurations of C 60 and C 70 molecules inside CNTs are reviewed. Therefore, the following changes of properties of the empty nanotubes, such as phonon modes, induced by the C 60 and C 70 filling inside nanotube are presented. We also briefly review the concept of Raman spectroscopy technique that provides information on phonon modes in carbon nanopeapods. The dependencies of the Raman spectrum as a function of nanotube diameter and chirality, fullerene molecules configuration and the filling level are identified and discussed. The experimental Raman spectra of fullerenes and fullerenes peapods are discussed in the light of theoretical calculation results. Finally, the variation of the average intensity ratio between C 60 and C 70 Raman-active modes and the nanotube ones, as a function of the concentration molecules, are analyzed, and a general good agreement is found between calculations and measurements.

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Spectral properties of single-walled carbon nanotubes encapsulating fullerenes

Cited by 22 publications

References 43 publications

Vibrational properties of nanographene

Vibrational properties of nanographene

A critical review of nanohybrids: synthesis, applications and environmental implications

Structural and Vibrational Properties of C60 and C70 Fullerenes Encapsulating Carbon Nanotubes

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