Nano-Peapods Encapsulating Fullerenes

Okazaki, Toshiya; Shinohara, Hisanori

doi:10.1007/3-540-28075-8_5

Cited by 8 publications

(7 citation statements)

References 53 publications

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“…SWCNTs contain a hollow space inside the tube wall to accommodate doping materials. In fact, it is known that many molecules can be doped into the interior space, causing changes in the Fermi level and the band gap of the host SWCNTs. − For example, scanning tunneling microscopy and spectroscopy (STM/STS) studies on SWCNTs encapsulating C 60 and Gd@C 82 (so-called “nanopeapods; NPDs”) revealed that the local density of states of SWCNTs are modulated by fullerene encapsulation at the molecular level. − …”

Section: Introductionmentioning

confidence: 99%

Electronic Structures of Single-Walled Carbon Nanotubes Encapsulating Ellipsoidal C₇₀

et al. 2010

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The molecular orientation of ellipsoidal C(70) in single-walled carbon nanotubes (SWCNTs) depends on the tube diameter (d(t)). Photoluminescence (PL) studies reveal that the fullerene encapsulation effects on the optical transition energy of SWCNTs are significantly different for C(70) and C(60) at d(t) = 1.405-1.431 nm. This indicates that the transition from the "lying" alignment to the "standing" alignment occurs at d(t) ≈ 1.41 nm and the electronic states of SWCNTs are very sensitive to the interspacing between the encapsulated molecules and the SWCNTs. The present findings suggest that the electronic structure of SWCNTs is tunable not only by alternating the encapsulated molecules but also by controlling their molecular orientations, thus paving the way for development of novel SWCNT-based devices.

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Section: Introductionmentioning

confidence: 99%

Electronic Structures of Single-Walled Carbon Nanotubes Encapsulating Ellipsoidal C₇₀

et al. 2010

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“…Because of their tubular structures, single-walled carbon nanotubes (SWCNTs) have been demonstrated to encapsulate various molecules and atoms. , The mechanical, electronic, and transport properties of SWCNTs frequently undergo considerable modification upon encapsulation, which allow us to finely tune these parameters by altering the encapsulated species. For example, fullerenes can be inserted in SWCNTs to form a linear chain of molecules, so-called nanopeapods . Low-temperature scanning tunneling spectroscopy (LT-STS) revealed that a band gap of semiconducting SWCNTs is narrowed at the site where fullerene molecules reside .…”

Section: Introductionmentioning

confidence: 99%

Diameter-Dependent Band Gap Modification of Single-Walled Carbon Nanotubes by Encapsulated Fullerenes

et al. 2008

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Band gap photoluminescence (PL) of single-walled carbon nanotubes (SWCNTs) encapsulating C 60 fullerenes (nanopeapods) is examined over a wide range of diameters (∼1.25-1.55 nm). The encapsulated fullerenes induce characteristic PL peak shifts that strongly depend on the tube diameter (d t ) and the "2n + m" family type {type I [mod(2n + m, 3) ) 1] and type II [mod(2n + m, 3) ) 2]}. This behavior can be explained by the strain-induced band gap shifts due to the C 60 insertion and the hybridization between the electronic states of SWCNTs and C 60 . The present results provide significant insights into band gap engineering of SWCNTs in future nanodevices.

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“…9−11 Fullerene encapsulated SWCNTs are the most popular combination for studying the fundamental properties of a caged system and intermolecular interactions between a tube and a molecule. 1,12 The encapsulation of fullerenes or metallofullerenes has been confirmed by high-resolution transmission electron microscopy, 13 electron loss spectroscopy, 14,15 X-ray diffraction (XRD) patterns, 16 scanning tunneling microscopy and spectroscopy through density of states measurements. 17 The intermolecular interactions have been widely studied by resonance Raman spectroscopy under chemical and electrochemical charging 18,19 and under external pressure, 20 examining temperature dependence 21 and tube diameter dependence 22 using visible to near UV wavelengths.…”

Section: ■ Introductionmentioning

confidence: 91%

“…The unique quasi-one-dimensional structure of single-walled carbon nanotubes (SWCNTs) has attracted considerable interest for both fundamental science and device applications. 1 The filling of the inner space of SWCNTs with other molecules is a fascinating subject since the interaction with the encapsulated molecules may lead to novel and attractive properties. 2−8 SWCNTs encapsulated sulfur have recently been intensively studied as a potential interest for a lithium− sulfur rechargeable battery.…”

Section: ■ Introductionmentioning

confidence: 99%

Intermolecular Interaction between Single-Walled Carbon Nanotubes and Encapsulated Molecules Studied by Polarization Resonance Raman Microscopy

et al. 2023

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In the present study, we investigated the intermolecular interactions between single-walled carbon nanotubes (SWCNTs) and encapsulated molecules by polarization resonance Raman microscopy. C70 encapsulated in SWCNTs is investigated under incident laser polarization parallel and perpendicular to the tube axis. We employed two excitation laser wavelengths 442 and 532 nm, which are in resonance with different electronic states of C70. Under 532 nm excitation, no distinct polarization dependence is found in the Raman spectral pattern, while under 442 nm excitation, a peak not previously seen for this excitation wavelength was clearly observed for parallel excitation. This result can be explained by the modulation of the resonance Raman process via a charge transfer contribution between C70 and the SWCNTs, which is sensitive to the incident polarization as well as the excitation wavelength. The intensity of the local electronic field inside a SWCNT is higher for the parallel excitation than the perpendicular excitation when the nanotubes are in a bundle. The results can be explained by field localization effects at the nanotube walls, qualitatively supported by finite-difference time-domain simulations.

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Nano-Peapods Encapsulating Fullerenes

Cited by 8 publications

References 53 publications

Electronic Structures of Single-Walled Carbon Nanotubes Encapsulating Ellipsoidal C₇₀

Electronic Structures of Single-Walled Carbon Nanotubes Encapsulating Ellipsoidal C₇₀

Diameter-Dependent Band Gap Modification of Single-Walled Carbon Nanotubes by Encapsulated Fullerenes

Intermolecular Interaction between Single-Walled Carbon Nanotubes and Encapsulated Molecules Studied by Polarization Resonance Raman Microscopy

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Nano-Peapods Encapsulating Fullerenes

Cited by 8 publications

References 53 publications

Electronic Structures of Single-Walled Carbon Nanotubes Encapsulating Ellipsoidal C70

Electronic Structures of Single-Walled Carbon Nanotubes Encapsulating Ellipsoidal C70

Diameter-Dependent Band Gap Modification of Single-Walled Carbon Nanotubes by Encapsulated Fullerenes

Intermolecular Interaction between Single-Walled Carbon Nanotubes and Encapsulated Molecules Studied by Polarization Resonance Raman Microscopy

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Electronic Structures of Single-Walled Carbon Nanotubes Encapsulating Ellipsoidal C₇₀

Electronic Structures of Single-Walled Carbon Nanotubes Encapsulating Ellipsoidal C₇₀