Anisotropic optical properties of mechanically aligned single-walled carbon nanotubes in polymer

Ichida, Masao; Mizuno, S.; Kataura, Hiromichi; Achiba, Yohji; Nakamura, Arao

doi:10.1007/s00339-003-2462-4

Cited by 87 publications

(61 citation statements)

References 12 publications

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“…This is consistent with the presence of a depolarization field. [25][26][27] While the topology of nanoribbons is quite different from that of SWNTs, there is a possibility that a depolarization field suppresses the absorption of the x-polarized light for armchair nanoribbons. The selection rule for zigzag nanoribbons is distinct from that for armchair nanoribbons, and the zigzag nanoribbons seem to be anomalous with respect to the depolarization effect.…”

Section: Discussionmentioning

confidence: 99%

Theory of optical transitions in graphene nanoribbons

et al. 2011

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Matrix elements of electron-light interactions for armchair and zigzag graphene nanoribbons are constructed analytically using a tight-binding model. The changes in wavenumber (∆n) and pseudospin are the necessary elements if we are to understand the optical selection rule. It is shown that incident light with a specific polarization and energy, induces an indirect transition (∆n = ±1), which results in a characteristic peak in the absorption spectra. Such a peak provides evidence that the electron standing wave is formed by multiple reflections at both edges of a ribbon. It is also suggested that the absorption of low-energy light is sensitive to the position of the Fermi energy, direction of light polarization, and irregularities in the edge. The effect of depolarization on the absorption peak is briefly discussed.

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Section: Discussionmentioning

confidence: 99%

Theory of optical transitions in graphene nanoribbons

et al. 2011

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“…Generally, a vertical alignment (perpendicular to the film surface) is desired to enable electron emission from the nanosized tip; this configuration is much more complex to achieve than the case where the CNTs would lie parallel to the film. Attempts to manipulate nanotube alignment have involved a variety of methods, including attempted alignment in the presence of strong magnetic [7] and electric fields [8], mechanical stretching [9], and shear forces and liquid flow [10]. All of these methods, however, rely on an external force to act on and orientate the nanotubes.…”

Section: Introductionmentioning

confidence: 99%

Aligned silane-treated MWCNT/liquid crystal polymer films

Cervini¹,

Simon²,

Ginic‐Markovic³

et al. 2008

Nanotechnology

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We report on a method to preferentially align multiwall carbon nanotubes (MWCNTs) in a liquid crystalline matrix to form stable composite thin films. The liquid crystalline monomeric chains can be crosslinked to form acrylate bridges, thereby retaining the nanotube alignment. Further post-treatment by ozone etching of the composite films leads to an increase in bulk conductivity, leading to higher emission currents when examined under conducting scanning probe microscopy. The described methodology may facilitate device manufacture where electron emission from nanosized tips is important in the creation of new display devices.

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“…By introducing carbon nanotubes (CNT) into a polymer matrix, many properties can be improved at once, including mechanical [4,5], thermo-mechanical [6], electrical [7,8], thermal [9,10], chemical [11] and optical properties [12].…”

Section: Introductionmentioning

confidence: 99%

Influence of hard segment content and nature on polyurethane/multiwalled carbon nanotube composites

Fernández-d’Arlas

Khan

Rueda

et al. 2011

Composites Science and Technology

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This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. carbon nanotubes percolative network formation seemed to be crucial for obtaining significant reinforcement, being observed at this stage, a reduction of ductility, phenomena which is related to an increase on hard domains interconnections by MWCNT. The hard to soft segment ratio into PU plays a crucial role on determining the stress transfer to MWCNT. In addition, PU hard domains nature has important effect on nanotubes reinforcing character, this fact being related to the different PU intrinsic morphologies as well as different PU-MWCNT interactions.

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Anisotropic optical properties of mechanically aligned single-walled carbon nanotubes in polymer

Cited by 87 publications

References 12 publications

Theory of optical transitions in graphene nanoribbons

Theory of optical transitions in graphene nanoribbons

Aligned silane-treated MWCNT/liquid crystal polymer films

Influence of hard segment content and nature on polyurethane/multiwalled carbon nanotube composites

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