Efficient Isolation and Solubilization of Pristine Single‐Walled Nanotubes in Bile Salt Micelles

Wenseleers, Wim; Власов, И. И.; Goovaerts, E.; Obraztsova, E. D.; Лобач, А. С.; Bouwen, A.

doi:10.1002/adfm.200400130

Cited by 471 publications

(583 citation statements)

References 47 publications

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“…129,130 To isolate SWNTs from aggregated bundles, an ultrasonic dispersion process is used to induce gaps at the bundle ends, allowing surfactant adsorption to propagate along the length of the bundle. 131 Since the seminal work of O'Connell et al…”

Section: Motivationmentioning

confidence: 99%

“…in 2002, 71 ultrasonic processing has been used to isolate SWNTs in an extensive library of dispersing agents including surfactants, 119,130 polymers, 120 single-stranded DNA, 19,132,133 peptides, 134 and cagelike molecules such as Sarkosyl. 135 Figure 3-1 contrasts the appearance of an aqueous suspension containing mostly bundles and an aqueous sample enriched in isolated SWNTs.…”

Section: Motivationmentioning

confidence: 99%

“…130 The presence of water at the SWNT surface increases the strength of the local dielectric environment, which shifts the fluorescence peak and lowers its intensity. 119 Based on this idea, the shifts in our fluorescence spectra indicate that SDS packs most densely on the SWNT (i.e., resulting in the lowest exposure to solvent), followed by SDBS, CAS, Tween 80, and DNA.…”

Section: Recommended Swnt Dispersing Agentsmentioning

confidence: 99%

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Photophysics of Individual Single-Walled Carbon Nanotubes

2008

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Single-walled carbon nanotubes (SWNTs) are cylindrical graphitic molecules that have remained at the forefront of nanomaterials research since 1991, largely due to their exceptional and unusual mechanical, electrical, and optical properties. The motivation for understanding how nanotubes interact with light (i.e., SWNT photophysics) is both fundamental and applied. Individual nanotubes may someday be used as superior near-infrared fluorophores, biological tags and sensors, and components for ultrahigh-speed optical communications systems. Establishing an understanding of basic nanotube photophysics is intrinsically significant and should enable the rapid development of such innovations. Unlike conventional molecules, carbon nanotubes are synthesized as heterogeneous samples, composed of molecules with different diameters, chiralities, and lengths. Because a nanotube can be either metallic or semiconducting depending on its particular molecular structure, SWNT samples are also mixtures of conductors and semiconductors. Early progress in understanding the optical characteristics of SWNTs was limited because nanotubes aggregate when synthesized, causing a mixing of the energy states of different nanotube structures. Recently, significant improvements in sample preparation have made it possible to isolate individual nanotubes, enabling many advances in characterizing their optical properties. In this Account, single-molecule confocal microscopy and spectroscopy were implemented to study the fluorescence from individual nanotubes. Single-molecule measurements naturally circumvent the difficulties associated with SWNT sample inhomogeneities. Intrinsic SWNT photoluminescence has a simple narrow Lorentzian line shape and a polarization dependence, as expected for a one-dimensional system. Although the local environment heavily influences the optical transition wavelength and intensity, single nanotubes are exceptionally photostable. In fact, they have the unique characteristic that their single molecule fluorescence intensity remains constant over time; SWNTs do not “blink” or photobleach under ambient conditions. In addition, transient absorption spectroscopy was used to examine the relaxation dynamics of photoexcited nanotubes and to elucidate the nature of the SWNT excited state. For metallic SWNTs, very fast initial recovery times (300–500 fs) corresponded to excited-state relaxation. For semiconducting SWNTs, an additional slower decay component was observed (50–100 ps) that corresponded to electron–hole recombination. As the excitation intensity was increased, multiple electron–hole pairs were generated in the SWNT; however, these e−h pairs annihilated each other completely in under 3 ps. Studying the dynamics of this annihilation process revealed the lifetimes for one, two, and three e−h pairs, which further confirmed that the photoexcitation of SWNTs produces not free electrons but rather one-dimensional bound electron–hole pairs (i.e., excitons). In summary, nanotube photophysics is a rapidly developing area o...

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Section: Motivationmentioning

confidence: 99%

Section: Motivationmentioning

confidence: 99%

Section: Recommended Swnt Dispersing Agentsmentioning

confidence: 99%

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Photophysics of Individual Single-Walled Carbon Nanotubes

2008

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“…Practically, the non-covalent functionalisation in aqua media was efficiently achieved via surfactant [164,167] or polymer [166] assisted ultra-sonication. Initially, the sonication breaks/collapses nanotube bundles with the following wrapping of the CNT by surfactants/ polymers.…”

Section: Hosting Polymersmentioning

confidence: 99%

Carbon nanotubes for ultrafast fibre lasers

et al. 2016

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Carbon nanotubes (CNTs) possess both remarkable optical properties and high potential for integration in various photonic devices. We overview, here, recent progress in CNT applications in fibre optics putting particular emphasis on fibre lasers. We discuss fabrication and characterisation of different CNTs, development of CNTbased saturable absorbers (CNT-SA), their integration and operation in fibre laser cavities putting emphasis on stateof-the-art fibre lasers, mode locked using CNT-SA. We discuss new design concepts of high-performance ultrafast operation fibre lasers covering ytterbium (Yb), bismuth (Bi), erbium (Er), thulium (Tm) and holmium (Ho)-doped fibre lasers.

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“…The reactor experiments were performed using aqueous anionic surfactant sodium deoxycholate (NaDOC) solution, which is known to facilitate improved dispersion of SW-CNTs 7,19 . Tests were conducted with and without CNTs 20 .…”

Section: Resultsmentioning

confidence: 99%

Influence of Acoustic Cavitation on the Controlled Ultrasonic Dispersion of Carbon Nanotubes

et al. 2013

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Ultrasonication is the most widely used technique for the dispersion of a range of nanomaterials, but the intrinsic mechanism which leads to stable solutions is poorly understood with procedures quoted in the literature typically specifying only extrinsic parameters such as nominal electrical input power and exposure time. Here we present new insights into the dispersion mechanism of a representative nanomaterial, single-walled carbon nanotubes (SW-CNTs), using a novel upscalable sonoreactor and an in situ technique for the measurement of acoustic cavitation activity during ultrasonication. We distinguish between stable cavitation, which leads to chemical modification of the surface of the CNTs, and inertial cavitation, which favors CNT exfoliation and length reduction. Efficient dispersion of CNTs in aqueous solution is found to be dominated

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Efficient Isolation and Solubilization of Pristine Single‐Walled Nanotubes in Bile Salt Micelles

Cited by 471 publications

References 47 publications

Photophysics of Individual Single-Walled Carbon Nanotubes

Photophysics of Individual Single-Walled Carbon Nanotubes

Carbon nanotubes for ultrafast fibre lasers

Influence of Acoustic Cavitation on the Controlled Ultrasonic Dispersion of Carbon Nanotubes

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