Chromophore Ordering by Confinement into Carbon Nanotubes

Almadori, Y.; Alvarez, Laurent; Parc, Rozenn Le; Aznar, R.; Fossard, F.; Loiseau, Annick; Jousselme, Bruno; Campidelli, Stéphane; Hermet, Patrick; Belhboub, Anouar; Rahmani, Abdelali; Saito, Tetsuya; Bantignies, J.-L.

doi:10.1021/jp505804d

Cited by 42 publications

(54 citation statements)

References 60 publications

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“…Accordingly, stronger host-guest (weaker guest-guest) interactions are a major (minor) factor for determining the arrangement of multimeric terfurans inside a nanotube. 28 Comparison between n Â 3F@(m,m) and n Â 3T@(m,m) interchain interactions Fig. The two terfurans are thus separated, and their interchain interactions are negligible.…”

Section: Multimeric Terfuran Oligomers Inside a Carbon Nanotubementioning

confidence: 99%

Key factors in determining the arrangement of π-conjugated oligomers inside carbon nanotubes

Yumura

Yamashita

2015

Phys. Chem. Chem. Phys.

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Density functional theory (DFT) calculations with dispersion corrections elucidated the key factors for determining the arrangement of π-conjugated oligomers inside a carbon nanotube. The current study considered methyl-terminated terfurans as guests inside a host tube; the results were compared with those obtained in previous studies for methyl-terminated terthiophenes inside a nanotube. DFT calculations found that the most important factor in determining the guest arrangement is the host-guest interactions arising from long-range CH-π and π-π interactions. In particular, the host-guest interactions play a crucial role in the arrangement of π-conjugated oligomers inside a larger-diameter tube: π-conjugated oligomers sit near the inner tube wall to maximize attractive host-guest interactions. Within a smaller-diameter tube, host-guest interactions, as well as guest-guest (interchain) interactions, are responsible for the guest arrangement. Then, stronger host-guest (weaker guest-guest) interactions are a major (minor) factor. The stronger host-guest interactions are sufficient to deform the inner π-conjugated oligomers. Due to the tube encapsulation, inner terfurans lose their planarity, leading to a weakening of the interchain interactions. In contrast, tube encapsulation induces terthiophenes to assume nearly planar structures, enhancing their interchain interactions. As a result, the magnitude of the interchain interactions is dependent on the type of inner oligomer. Reflecting the different interchain interactions, multimeric terfurans inside a nanotube exhibit molecular packings that are different from those of the corresponding terthiophenes. Considering the importance of the arrangement of inner π-conjugated oligomers to their electronic properties, nanotube containers can thus tune the properties of inner oligomers.

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Section: Multimeric Terfuran Oligomers Inside a Carbon Nanotubementioning

confidence: 99%

Key factors in determining the arrangement of π-conjugated oligomers inside carbon nanotubes

Yumura

Yamashita

2015

Phys. Chem. Chem. Phys.

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“…S1(a)). Such a shift, as reported in other SWCNTs doped with organic molecules, is an important indication for the filling of dopant inside a tube, which is a result from the appearance of interactions between guest molecules and host tubes. Note that the G‐band is extremely sensitive to the charge transfer between the encapsulated molecules and the tubes, while no visible shift in this band (Fig.…”

Section: Resultsmentioning

confidence: 98%

“…Let us discuss the possible arrangements of the confined nanoribbon analogs inside the nanotubes. It has been shown that depending on the diameter, quaterthiophene molecules for instance can be found forming several layers inside the tubes . In the case of perylene molecules, a similar study by Koyama et al .…”

Section: Resultsmentioning

confidence: 99%

“…It has been shown that depending on the diameter, quaterthiophene molecules for instance can be found forming several layers inside the tubes. [25] In the case of perylene molecules, a similar study by Koyama et al [21] has been shown recently that only one molecule is encapsulated in SWNTs with tube diameter of~1.3 nm, and two molecules can be confined forming an H-type configuration when the diameter is above 1.5 nm. Taking into account the nanotubes with average diameters of 1.4 nm used in our experiments, we thus suggested that large numbers of the tubes are filled with only one molecule.…”

Section: Characterization Of Gnras@swcnts Samplementioning

confidence: 85%

“…Raman spectroscopy is a powerful and nondestructive tool to characterize the encapsulation of organic molecules inside carbon nanotubes, [8,[25][26][27][28] which is widely used in the study of carbonaceous materials. Figure S1 shows the Raman spectra of pristine SWCNTs and GNRAs@SWCNTs synthesized at 400°C.…”

Section: Characterization Of Gnras@swcnts Samplementioning

confidence: 99%

See 2 more Smart Citations

Raman study of graphene nanoribbon analogs confined in single‐walled carbon nanotubes and their high‐pressure transformations

Yang

Yao

Zhang

et al. 2017

J Raman Spectroscopy

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Single wall carbon nanotubes with a diameter distribution from 1.30 to 1.55 nm filled with perylene molecules were synthesized via a vapor‐phase encapsulation method. The perylene molecules formed short‐chain nanoribbon analogs inside the tubes by polymerization. The polymerization of perylene molecules is found to be dependent on the annealing temperature and thus the length of the formed nanoribbons. High‐pressure transformation of the formed hybrid nanostructure has been studied by means of Raman spectroscopy combined with theoretical simulation. It is found that the encapsulated nanoribbon analogs can act as a probe for identifying the structural transitions of the host nanotubes. In comparison to empty carbon nanotube, filling with nanoribbon analogs into the nanotubes decreases the collapse pressure of the nanotubes, which can be explained in terms of their inhomogeneous interactions between the fillers and carbon nanotubes. Our theoretical calculation gives further insight into the experimental observations. Copyright © 2017 John Wiley & Sons, Ltd.

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Confinement of Dyes inside Boron Nitride Nanotubes: Photostable and Shifted Fluorescence down to the Near Infrared

et al. 2020

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Fluorescence is ubiquitous in life science and used in many fields of research ranging from ecology to medicine. Among the most common fluorogenic compounds, dyes are being exploited in bioimaging for their outstanding optical properties from UV down to the near IR (NIR). However, dye molecules are often toxic to living organisms and photodegradable, which limits the time window for in vivo experiments. Here, it is demonstrated that organic dye molecules are passivated and photostable when they are encapsulated inside a boron nitride nanotube (dyes@BNNT). The results show that the BNNTs drive an aggregation of the encapsulated dyes, which induces a redshifted fluorescence from visible to NIR‐II. The fluorescence remains strong and stable, exempt of bleaching and blinking, over a time scale longer than that of free dyes by more than 104. This passivation also reduces the toxicity of the dyes and induces exceptional chemical robustness, even in harsh conditions. These properties are highlighted in bioimaging where the dyes@BNNT nanohybrids are used as fluorescent nanoprobes for in vivo monitoring of Daphnia Pulex microorganisms and for diffusion tracking on human hepatoblastoma cells with two‐photon imaging.

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Chromophore Ordering by Confinement into Carbon Nanotubes

Cited by 42 publications

References 60 publications

Key factors in determining the arrangement of π-conjugated oligomers inside carbon nanotubes

Key factors in determining the arrangement of π-conjugated oligomers inside carbon nanotubes

Raman study of graphene nanoribbon analogs confined in single‐walled carbon nanotubes and their high‐pressure transformations

Confinement of Dyes inside Boron Nitride Nanotubes: Photostable and Shifted Fluorescence down to the Near Infrared

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