Modulating Chirality-Selective Photoluminescence of Single-Walled Carbon Nanotubes by Ionic Liquids

Castillo, Marlius; Pho, Christine; Naumov, Anton V.; Dzyuba, Sergei V.

doi:10.1021/acs.jpclett.8b02734

Cited by 3 publications

(3 citation statements)

References 51 publications

(79 reference statements)

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“…In turn, charge transport is governed by charge-scattering processes, among which electron–phonon scattering constitutes the main mechanism of charge and energy losses to heat. Multiple time-resolved spectroscopic experiments and a few simulations have been carried out in order to characterize charge scattering in CNTs and GNRs, including both carrier–carrier and carrier–phonon scattering. − It has been demonstrated that energetic charge carriers in CNTs couple to the high-frequency G-modes, while charges with lower energies couple to lower-frequency radial breathing (RBM) vibrations. Atomic and boundary defects, as well as CNT ends, are known to contribute significantly to nonradiative charge–phonon relaxation, because CNTs are very good conductors and charges can easily reach defect sites.…”

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confidence: 99%

“…In particular, Bonn and co-workers measure time-resolved photoconductivity of CNTs and GNRs and show that electron–phonon scattering events are more frequent in GNRs, and as a result, the conductivity decays several times faster in GNRs than CNTs. These as well as many other − time-resolved experiments are most closely mimicked by nonadiabatic (NA) molecular dynamics (MD) techniques, developed initially in the 1960s and 1970s to study gas-phase and surface scattering processes and adapted later − to condensed-phase systems. Our group developed several NAMD approaches − designed specifically for nanoscale systems and implemented them within time-dependent density functional theory (TDDFT). − …”

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confidence: 99%

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Electron–Phonon Scattering Is Much Weaker in Carbon Nanotubes than in Graphene Nanoribbons

Zhou

Cen

Wang

et al. 2019

J. Phys. Chem. Lett.

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Carbon nanotubes (CNTs) and graphene nanoribbons (GNRs) are lower-dimensional derivatives of graphene. Similar to graphene, they exhibit high charge mobilities; however, in contrast to graphene, they are semiconducting and thus are suitable for electronics, optics, solar energy devices, and other applications. Charge carrier mobilities, energies, and lifetimes are governed by scattering with phonons, and we demonstrate, using ab initio nonadiabatic molecular dynamics, that charge–phonon scattering is much stronger in GNRs. Focusing on a GNR and a CNT of similar size and electronic properties, we show that the difference arises because of the significantly higher stiffness of the CNT. The GNR undergoes large-scale undulating motions at ambient conditions. Such thermal geometry distortions localize wave functions, accelerate both elastic and inelastic charge–phonon scattering, and increase the rates of energy and carrier losses. Even though, formally, both CNTs and GNRs are quantum confined derivatives of graphene, charge–phonon scattering differs significantly between them. Showing good agreement with time-resolved photoconductivity and photoluminescence measurements, the study demonstrates that GNRs are quite similar to molecules, such as conjugated polymers, while CNTs exhibit extended features attributed to bulk materials. The state-of-the-art simulations alter the traditional view of graphene nanostructures and demonstrate that the performance can be tuned not only by size and composition but also by stiffness and response to thermal excitation.

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confidence: 99%

mentioning

confidence: 99%

Electron–Phonon Scattering Is Much Weaker in Carbon Nanotubes than in Graphene Nanoribbons

Zhou

Cen

Wang

et al. 2019

J. Phys. Chem. Lett.

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“…It was previously shown that certain ssDNA-SWCNT combinations exhibit chirality-dependent responses upon molecular recognition. [56,[58][59][60][61] Moreover, several DNA sequences were shown to preferentially bind one handedness, [56] which can in turn affect the fluorescence response to one enantiomer over the other. In our study, some SWCNT chiralities [(9,5), (8,7), (6,5)] were more responsive than others when suspended with (ATTT) 7 , hinting a possible chirality dependence of the sensor, which might contribute to the obvious distinction between the enantiomers D2HG and L2HG.…”

Section: Screeningmentioning

confidence: 99%

Oncometabolite Fingerprinting Using Fluorescent Single‐Walled Carbon Nanotubes

Amir

Hendler‐Neumark

Wulf

et al. 2021

Adv Materials Inter

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These local changes in the levels of involved metabolites or products can indicate an ongoing process of a cancerous transformation, and even further contribute to its escalation, rendering them oncometabolites. [1][2][3][4][5][6][7][8][9] D-2-hydroxyglutarate (D2HG) is a product of the gain-of-function-mutated enzymes isocitrate dehydrogenase (IDH1/ IDH2), whereas the normal mitochondrial form plays a role in the tricarboxylic acid (TCA) cycle by producing α-ketoglutarate. [1,2,[4][5][6][7][8][9] Hence, an accumulation of D2HG in the mitochondria indicates a mutagenesis of isocitrate dehydrogenase (IDH) and interruption of the TCA cycle, implying that the cell is in a state of pseudo-hypoxia (resembling a state of low oxygen levels), and mainly relying on glycolysis for energy production (Scheme 1). [4] Normally, as a minor metabolic byproduct, D2HG levels are kept low as D-2-hydroxyglutarate dehydrogenase (D2HGDH) converts it to α-ketoglutarate. [1,10] However, D2HGDH does not prevent D2HG accumulation in the case of overproduction. [10] Moreover, a congenital loss of D2HGDH causes D2HG accumulation, which can lead to a severe brain damage in a rare condition called D-2-hydroxyglutarate aciduria. [1,10] The accumulation of D2HG was shown to inhibit a group of enzymes named a-ketoglutarate-dependent dioxygenases (aKGdd), resulting in the promotion of mutagenesis by epigenetic modification of DNA and histone hypermethylation. [1,4,5,7] Notably, IDH1-mutated tumors were shown to exhibit DNA hypermethylation in gliomas and leukemia, and also histone hypermethylation. [1,[5][6][7]9,11] Accumulation of 2-hydroxyglutarate (both D and L optical isomers) was found to suppress cell-proliferation regulation. [1,9] As a demonstration of D2HG cellular potency, it was shown that incubating hematopoietic stem cells with D2HG alters differentiation patterns and promotes immune resistance. [1,6] IDH mutations and D2HG accumulation were found in gliomas and glioblastomas, and D2HG accumulation is suspected to be sufficient for promoting the development of acute myeloid leukemia (AML). [1,6] Another possible oncogenic mechanism linked to D2HG abundance, is its ability to shift cellular redox equilibrium toward overproduction of reactive oxygen species (ROS), which are well-known oncogenic agents. [4] The same mechanism was also found to impair immune antitumor activity. [1,8] The production of oncometabolites is the direct result of mutagenesis in key cellular metabolic enzymes, appearing typically in cancers such as glioma, leukemia, and glioblastoma. Once accumulated, oncometabolites promote cancerous transformations by interfering with important cellular functions. Hence, the ability to sense and quantify oncometabolites is essential for cancer research and clinical diagnosis. Here, the authors present a near-infrared optical nanosensor for a known oncometabolite, D-2-hydroxyglutarate (D2HG), discovered in a screening of a library of fluorescent single-walled carbon nanotubes (SWCNTs) functionalized with ssDNA. The screening r...

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Chirality luminescent properties of single-walled carbon nanotubes during redox reactions

Matsukawa

Umemura

2021

Optical Materials

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Modulating Chirality-Selective Photoluminescence of Single-Walled Carbon Nanotubes by Ionic Liquids

Cited by 3 publications

References 51 publications

Electron–Phonon Scattering Is Much Weaker in Carbon Nanotubes than in Graphene Nanoribbons

Electron–Phonon Scattering Is Much Weaker in Carbon Nanotubes than in Graphene Nanoribbons

Oncometabolite Fingerprinting Using Fluorescent Single‐Walled Carbon Nanotubes

Chirality luminescent properties of single-walled carbon nanotubes during redox reactions

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