Short-length carbon nanotubes as building blocks for high dielectric constant materials in the terahertz range

Шуба, М. В.; Paddubskaya, A.; Kuzhir, P.; Maksimenko, S. A.; Flahaut, Emmanuel; Fierro, Vanessa; Celzard, Alain; Valušis, Gintaras

doi:10.1088/1361-6463/aa5628

Cited by 15 publications

(14 citation statements)

References 24 publications

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“…d e e = ( ) ( ) for films comprising large-and small-size GNPs. The differences between the samples are identical to those observed for films comprising short and long CNTs [35]. Namely, (i) the real parts of the conductivity and permittivity and loss tangent are larger for large-size GNPs, and (ii) frequency dependence of the conductivity is stronger for smaller-size GNPs.…”

Section: Resultssupporting

confidence: 63%

Frequency and density dependencies of the electromagnetic parameters of carbon nanotube and graphene nanoplatelet based composites in the microwave and terahertz ranges

Шуба¹,

Yuko²,

Gorokhov³

et al. 2019

Mater. Res. Express

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Section: Resultssupporting

confidence: 63%

Frequency and density dependencies of the electromagnetic parameters of carbon nanotube and graphene nanoplatelet based composites in the microwave and terahertz ranges

Шуба¹,

Yuko²,

Gorokhov³

et al. 2019

Mater. Res. Express

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“…The universal conductivity behavior has been observed also by Polley et al [233,234] In the first paper [233] the authors used SW CNT/polymer composites where the conductivity of the samples was tuned by changing the CNT length (up to 15 µm) and the weight fraction. [235] Shuba et al [236] proposed short-length p-doped CTNs as building blocks for high-epsilon materials in the THz range. The conductivity or permittivity of CNT-containing composites was shown to be tuned by the concentration of Au nanoparticles at the sidewalls [234] or, e.g., by concentration of iron in iron-filled MW CNTs embedded in a polymer.…”

Section: Thz Response Of Carbon Nanotubesmentioning

confidence: 99%

Terahertz Spectroscopy of Nanomaterials: a Close Look at Charge‐Carrier Transport

Kužel

Němec

2019

Advanced Optical Materials

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Transport of charges is a fundamental process in many high-tech applications including photovoltaic or optoelectronic devices, but also in more ordinary components such as unsophisticated wires and other circuitry. The development of nanotechnologies resulted in the fabrication of highly complex materials consisting of a large variety of nanosized elements, which inevitably involve a multitude of charge transport processes occurring on various time-and length-scales. Figure 1 summarizes the most common nanoelements with high application potential.For example, the electrodes employed in Grätzel solar cells [1] are composed of percolated networks of a huge number of metal oxide nanoparticles (top-left panel in Figure 1). Colloidal nanocrystals form the basis for thin film electronics and flexible electronic devices. [2] The synthetic approaches control their composition, size and electronic structure (energy levels, density of states within the bands and in the bandgap) and the charge-carrier transport. [2,3] Nanowires and nanotubes made of conventional semiconductors are quasi 1D systems combining Terahertz spectroscopy has been used for almost two decades for investigations of nanomaterials, including nanocrystals, nanoparticles, nanowires, nanotubes or 2D crystals. Its great importance stems from the fact that it is a noncontact method and, owing to its high frequency and broadband character, it is capable of characterizing charge transport properties within individual nano-objects but also among them. In addition, probing of photoinitiated ultrafast charge dynamics is possible thanks to the sub-picosecond time resolution. Despite this unprecedented potential, the interpretation of the measured terahertz conductivity spectra in many materials is still intensively debated. Herein is presented a review of the experiments performed on nanostructures of conventional semiconductors and on carbon nanomaterials (graphene and carbon nanotubes) during the past decade. The state of the art of the theoretical formalism is provided and discussed, including the intrinsic response, as well as the role of inherent heterogeneity and of the experimental conditions.

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“…Both pure-and doped-CNT films, with thickness of ≈1 μm, were fabricated via the vacuum filtration technique [30,31]. A typical scanning electron microscopy (SEM) image of the B-CNT film is represented in Fig.…”

Section: Resultsmentioning

confidence: 99%

Localized plasmon resonance in boron-doped multiwalled carbon nanotubes

et al. 2018

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Substitutionally boron-doped multiwalled carbon nanotubes (B-CNTs) with lengths mainly less than 0.5 μm and diameters 10-30 nm have been obtained by arc-discharge evaporation of the graphite anode containing boron material. The broad peak has been observed in the midinfrared conductivity spectra of the thin film comprising B-CNTs. The peak was suggested to be associated with a phenomenon known as localized plasmon resonance. Theoretical analysis has been done to confirm the possibility of this phenomenon to occur in the B-CNTs.

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Short-length carbon nanotubes as building blocks for high dielectric constant materials in the terahertz range

Abstract: OATAO is an open access repository that collects the work of Toulouse researchers and makes it freely available over the web where possible.

Cited by 15 publications

References 24 publications

Frequency and density dependencies of the electromagnetic parameters of carbon nanotube and graphene nanoplatelet based composites in the microwave and terahertz ranges

Frequency and density dependencies of the electromagnetic parameters of carbon nanotube and graphene nanoplatelet based composites in the microwave and terahertz ranges

Terahertz Spectroscopy of Nanomaterials: a Close Look at Charge‐Carrier Transport

Localized plasmon resonance in boron-doped multiwalled carbon nanotubes

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