Chiral-index resolved length mapping of carbon nanotubes in solution using electric-field induced differential absorption spectroscopy

Li, Wenshan; Hennrich, Frank; Flavel, Benjamin S.; Kappes, Manfred M.; Krupke, Ralph

doi:10.1088/0957-4484/27/37/375706

Cited by 8 publications

(14 citation statements)

References 33 publications

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“…is frequencydependent and known as the Clausius-Mossotti factor (CMF) [46,59,60]. The depolarization index  L is determined by the CNT geometry, as discussed in Ref.…”

Section: (C) Dielectrophoretic Forcementioning

confidence: 99%

“…Recently, Li et al [60] reported that the low-frequency approximation of the CMF as given in the Eq. ( 15) is inaccurate when the high-conductivity aqueous surfactant medium ( m σ » 0.004 S/m for 0.01w-% sodium dodecyl sulfate (SDS)-water) is replaced by a low conductivity solvent, such as toluene ( 11 m 10 σ -£ S/m) in the CNT DEP.…”

Section: (C) Dielectrophoretic Forcementioning

confidence: 99%

“…In general, the SWCNT alignment is frequently characterized by the Nematic order parameter S, which is zero in a disordered phase and non-zero in an ordered phase as discussed in Refs. [60,62]. Assuming that the CNT is aligned within the same plane (such as 1-2 plane in Fig.…”

Section: (C) Cnt Alignmentmentioning

confidence: 99%

“…is the permittivity of water with 0 ε the vacuum permittivity [60], see Table 1. An overview of DL λ , σ and 1…”

Section: Electrical Double Layermentioning

confidence: 99%

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Principles of carbon nanotube dielectrophoresis

Hennrich

Flavel

et al. 2021

Nano Res.

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Dielectrophoresis (DEP) describes the motion of suspended objects when exposed to an inhomogeneous electric field. It has been successful as a method for parallel and site-selective assembling of nanotubes from a dispersion into a sophisticated device architecture. Researchers have conducted extensive works to understand the DEP of nanotubes in aqueous ionic surfactant solutions. However, only recently, DEP was applied to polymer-wrapped single-walled carbon nanotubes (SWCNTs) in organic solvents due to the availability of ultra-pure SWCNT content. In this paper, the focus is on the difference between the DEP in aqueous and organic solutions. It starts with an introduction into the DEP of carbon nanotubes (CNT-DEP) to provide a comprehensive, in-depth theoretical background before discussing in detail the experimental procedures and conditions. For academic interests, this work focuses on the CNT-DEP deposition scheme, discusses the importance of the electrical double layer, and employs finite element simulations to optimize CNT-DEP deposition condition with respect to the experimental observation. An important outcome is an understanding of why DEP in organic solvents allows for the deposition and alignment of SWCNTs in low-frequency and even static electric fields, and why the response of semiconducting SWCNTs (s-SWCNTs) is strongly enhanced in non-conducting, weakly polarizable media. Strategies to further improve CNT-DEP for s-SWCNT-relevant applications are given as well. Overall, this work should serve as a practical guideline to select the appropriate setting for effective CNT DEPs.

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“…is frequencydependent and known as the Clausius-Mossotti factor (CMF) [46,59,60]. The depolarization index  L is determined by the CNT geometry, as discussed in Ref.…”

Section: (C) Dielectrophoretic Forcementioning

confidence: 99%

Section: (C) Dielectrophoretic Forcementioning

confidence: 99%

Section: (C) Cnt Alignmentmentioning

confidence: 99%

“…is the permittivity of water with 0 ε the vacuum permittivity [60], see Table 1. An overview of DL λ , σ and 1…”

Section: Electrical Double Layermentioning

confidence: 99%

See 2 more Smart Citations

Principles of carbon nanotube dielectrophoresis

Hennrich

Flavel

et al. 2021

Nano Res.

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“…In addition, we note that the sorting process uses a sonication and ultracentrifugation steps that could affect the length distribution following the nanotube diameters. It is likely that larger diameter nanotubes are harder to break, and after processing only larger diameter nanotubes (corresponding to smaller band‐gap) are long enough to bridge the two contacts.…”

Section: Resultsmentioning

confidence: 99%

Polarization‐Sensitive Single‐Wall Carbon Nanotubes All‐in‐One Photodetecting and Emitting Device Working at 1.55 µm

Balestrieri

Keita

Durán-Valdeiglesias

et al. 2017

Adv Funct Materials

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International audienceFunctional and easy-to-integrate nanodevices operating in the telecom wavelength ranges are highly desirable. Indeed, the pursuit for faster, cheaper, and smaller transceivers for datacom applications is fueling the interest in alternative materials to develop the next generation of photonic devices. In this context, single wall carbon nanotubes (SWNTs) have demonstrated outstanding electrical and optical properties that make them an ideal material for the realization of ultracompact optoelectronic devices. Still, the mixture in chirality of as-synthesized SWNTs and the necessity of precise positioning of SWNT-based devices hinder the development of practical devices. Here, the realization of operational devices obtained using liquid solution-based techniques is reported, which allow high-purity sorting and localized deposition of aligned semiconducting SWNTs (s-SWNTs). More specifically, devices are demonstrated by combining a polymer assisted extraction method, which enables a very effective selection of s-SWNTs with a diameter of about 1–1.2 nm, with dielectrophoresis, which localizes the deposition onto silicon wafers in aligned arrays in-between prepat-terned electrodes. Thus, long semiconducting nanotubes directly contact the electrodes and, when asymmetric contacts (i.e., source and drain made of different metals) are used, each device can operate both as photoemitter and as photodetector in the telecom band around 1.55 µm in air at room temperature

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Carbon Nanotube Length Distribution Estimation by One-Dimensional Plasmon Resonance for Solid-State Samples

2021

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We propose a method for estimating the carbon nanotube (CNT) length distribution in solid-state samples by one-dimensional plasmon resonance. The optical signal from thin-film samples originated from an ensemble of CNTs with various lengths contained inside the samples. Therefore, the optical signals were converted to the effective CNT length versus normalized intensity depending on the number of CNTs. The signal line profiles were almost completely reproduced using multiple lognormal functions representing an ensemble length distribution. The mean CNT length, which was calculated from this length distribution, was in good agreement with the mean length obtained from the conventional method using an atomic force microscope. Our method enables a shorter measurement time for solid-state samples than the conventional AFM method. Therefore, it should have wide application due to the more easily estimated CNT lengths.

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Chiral-index resolved length mapping of carbon nanotubes in solution using electric-field induced differential absorption spectroscopy

Cited by 8 publications

References 33 publications

Principles of carbon nanotube dielectrophoresis

Principles of carbon nanotube dielectrophoresis

Polarization‐Sensitive Single‐Wall Carbon Nanotubes All‐in‐One Photodetecting and Emitting Device Working at 1.55 µm

Carbon Nanotube Length Distribution Estimation by One-Dimensional Plasmon Resonance for Solid-State Samples

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