Enhancing the Infrared Response of Carbon Nanotubes From Oligo-Quaterthiophene Interactions

Belhboub, Anouar; Hermet, Patrick; Alvarez, Laurent; Parc, Rozenn Le; Rols, S.; Selvati, A. C. Lopes; Jousselme, Bruno; Sato, Yuta; Suenaga, Kazu; Rahmani, A.; Bantigniès, Jean-Louis

doi:10.1021/acs.jpcc.6b09329

Cited by 21 publications

(18 citation statements)

References 19 publications

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“…Local energy loss measurements in regions 1 and 2 (Figure 2e) show the expected transitions at around 3 eV (region 1) for the HOMO–LUMO gap of 6T molecules and at 5.5 eV (region 2) for the BNNT bandgap. Consistent to other HRTEM studies on similar oligothiophenes encapsulation inside SWCNTs, [ 19,20,33,34 ] the EELS results presented here confirm that the 6Ts are encapsulated inside BNNTs.…”

Section: Figuresupporting

confidence: 92%

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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Section: Figuresupporting

confidence: 92%

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

et al. 2020

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“…These results demonstrate that the 6T@BNNT is far more stable than free 6T dyes. The Consistent to other reports on similar oligothiophene encapsulation inside SWCNTs 19,20,31,32 , the results confirm the encapsulation of the 6Ts inside BNNTs. The assembly of dyes inside BNNTs into aligned and structured aggregates is consistent with the assembly behavior observed on elongated dyes encapsulated inside SWCNTs [19][20][21][22]31,33 .…”

Section: Resultssupporting

confidence: 92%

Dyes@BNNT Nanohybrids for Photostable Fluorescence Imaging

Allard¹,

Nascimento²,

Fossard³

et al. 2019

Preprint

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<div><div><div><p>Fluorescence is ubiquitous in life science and used in broad fields of research going from ecology to medicine. Among the most common fluorogenic compounds, dyes are being exploited in bioimaging for their outstanding optical properties across a broad range of wavelengths from the UV to the near-IR. However, dye molecules are often toxic to living organisms and photodegradable, giving limited time windows for in vivo monitoring. By encapsulating organic dyes inside a boron nitride nanotube (dyes@BNNT), we achieve a passivation of the dyes against photodegradation and chemical reaction. The dyes@BNNT nanohybrids contain aggregated and ordered dyes exhibiting strong photoluminescence with signal remaining stable and exempt of blinking over a time scale of more than 10^4 compared to free dyes. Our results also suggest reduced toxicity and exceptional chemical robustness even in harsh environments. The use of these 1D dyes@BNNT nanohybrids as fluorescence nanoprobes in bio-imaging is highlighted with in-vivo monitoring experiments on living Daphnia Pulex.</p></div></div></div>

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“…For very small diameter tubes (below 0.86 nm corresponding to minimum diameter allowing 4T encapsulation), the 4T molecule is incorporated but induces constraints on the nanotube and leads to mechanical strains. In contrast, on large diameter tubes, the molecules are located near the center of the tube with only weak mechanical constraints [52]. Moreover, the sign of the strain induced shift depends also on q=n-m mod (3).…”

Section: Figure 7: A) Pl Intensity Ratio Between 4t@nt09 and Nt09 As mentioning

confidence: 98%

Fermi level shift in carbon nanotubes by dye confinement

Almadori

Delport

Chambard

et al. 2019

Carbon

Self Cite

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Dye confinement into carbon nanotube significantly affects the electronic charge density distribution of the final hybrid system. Using the electron-phonon coupling sensitivity of the Raman G-band, we quantify experimentally how charge transfer from thiophene oligomers to single walled carbon nanotube is modulated by the diameter of the nano-container and its metallic or semiconducting character. This charge transfer is shown to restore the electron-phonon coupling into defected metallic nanotubes. For sub-nanometer diameter tube, an electron transfer optically activated is observed when the excitation energy matches the HOMO-LUMO transition of the confined oligothiophene. This electron doping accounts for an important enhancement of the photoluminescence intensity up to a factor of nearly six for optimal confinement configuration. This electron transfer shifts the Fermi level, acting on the photoluminescence efficiency. Therefore, thiophene oligomer encapsulation allows modulating the electronic structure and then the optical properties of the hybrid system.

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Enhancing the Infrared Response of Carbon Nanotubes From Oligo-Quaterthiophene Interactions

Cited by 21 publications

References 19 publications

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

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

Dyes@BNNT Nanohybrids for Photostable Fluorescence Imaging

Fermi level shift in carbon nanotubes by dye confinement

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