Potassium intercalated multiwalled carbon nanotubes

Chacón-Torres, Julio C.; Dzsaber, S.; Vega-Díaz, Sofia Magdalena; Akbarzadeh, Johanna; Peterlik, Herwig; Kotakoski, Jani; Argentero, Giacomo; Meyer, Jannik C.; Pichler, Thomas; Simón, F.; Terrones, Mauricio; Reich, Stéphanie

doi:10.1016/j.carbon.2016.04.016

Cited by 20 publications

(20 citation statements)

References 17 publications

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“…We approximate the latter two quantities with the ones calculated for KC 8 : ω A = 1223 cm −1 and ω NA = 1534 cm −1 , as no exact calculation exists for FLG. This approximation was found to be valid in similar hexagonal carbon systems such as potassium doped multiwalled carbon nanotubes 53 .…”

Section: Resultsmentioning

confidence: 91%

Characterizing the maximum number of layers in chemically exfoliated graphene

Szirmai

Márkus

Chacón-Torres

et al. 2019

Sci Rep

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An efficient route to synthesize macroscopic amounts of graphene is highly desired and bulk characterization of such samples, in terms of the number of layers, is equally important. We present a Raman spectroscopy-based method to determine the typical upper limit of the number of graphene layers in chemically exfoliated graphene. We utilize a controlled vapour-phase potassium intercalation technique and identify a lightly doped stage, where the Raman modes of undoped and doped few-layer graphene flakes coexist. The spectra can be unambiguously distinguished from alkali doped graphite, and modeling with the typical upper limit of the layers yields an upper limit of flake thickness of five layers with a significant single-layer graphene content. Complementary statistical AFM measurements on individual few-layer graphene flakes find a consistent distribution of the layer numbers.

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Section: Resultsmentioning

confidence: 91%

Characterizing the maximum number of layers in chemically exfoliated graphene

Szirmai

Márkus

Chacón-Torres

et al. 2019

Sci Rep

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“…The Fano resonance is a characteristic signature from a highly doped potassium intercalated compound as it has been shown from a stage I GIC KC 8 in MWCNTs KC 8 . 36 In addition, it is highly important to consider that an asymmetric Fano line shape of the G-line originates from the strong electron phonon-coupling existing between the K atoms and the graphitic structure of the fullerene and other intercalation compounds. The strong electron phonon-coupling in graphitic based intercalation compounds is a signature of a superconducting potential behavior of the material.…”

Section: Resultsmentioning

confidence: 99%

Carbon Nano-onions: Potassium Intercalation and Reductive Covalent Functionalization

et al. 2021

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Herein we report the synthesis of covalently functionalized carbon nano-onions (CNOs) via a reductive approach using unprecedented alkali-metal CNO intercalation compounds. For the first time, an in situ Raman study of the controlled intercalation process with potassium has been carried out revealing a Fano resonance in highly doped CNOs. The intercalation was further confirmed by electron energy loss spectroscopy and X-ray diffraction. Moreover, the experimental results have been rationalized with DFT calculations. Covalently functionalized CNO derivatives were synthesized by using phenyl iodide and n -hexyl iodide as electrophiles in model nucleophilic substitution reactions. The functionalized CNOs were exhaustively characterized by statistical Raman spectroscopy, thermogravimetric analysis coupled with gas chromatography and mass spectrometry, dynamic light scattering, UV–vis, and ATR-FTIR spectroscopies. This work provides important insights into the understanding of the basic principles of reductive CNOs functionalization and will pave the way for the use of CNOs in a wide range of potential applications, such as energy storage, photovoltaics, or molecular electronics.

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“…The spectra showed the characteristic features of KC 8 , a Breigt–Wigner–Fano (BWF) line‐shape around 1500 cm –1 and the C z mode at 560 cm –1 (Fig. b) .…”

Section: Resultsmentioning

confidence: 99%

”Eau de graphene” from a KC₈ graphite intercalation compound prepared by a simple mixing of graphite and molten potassium

Bepete

Hof

Huang

et al. 2016

Physica Rapid Research Ltrs

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We synthesized KC8 by simply mixing molten potassium and graphite at 180 °C under inert atmosphere. The KC8 shows typical shiny bronze color, Raman characteristics and XRD pattern of an efficiently intercalated stage 1 GIC, and is of sufficient quality to produce fully exfoliated graphenide solutions in tetrahydrofuran (THF) and subsequently single layer graphene in water as ”eau de graphene” (EdG). The evolution of absorption and Raman spectroscopic signatures of the EdG as a function of processing conditions give key indications on the number of layers of the graphene flakes dispersed in EdG. (© 2016 WILEY‐VCH Verlag GmbH &Co. KGaA, Weinheim)

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Potassium intercalated multiwalled carbon nanotubes

Cited by 20 publications

References 17 publications

Characterizing the maximum number of layers in chemically exfoliated graphene

Characterizing the maximum number of layers in chemically exfoliated graphene

Carbon Nano-onions: Potassium Intercalation and Reductive Covalent Functionalization

”Eau de graphene” from a KC₈ graphite intercalation compound prepared by a simple mixing of graphite and molten potassium

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Potassium intercalated multiwalled carbon nanotubes

Cited by 20 publications

References 17 publications

Characterizing the maximum number of layers in chemically exfoliated graphene

Characterizing the maximum number of layers in chemically exfoliated graphene

Carbon Nano-onions: Potassium Intercalation and Reductive Covalent Functionalization

”Eau de graphene” from a KC8 graphite intercalation compound prepared by a simple mixing of graphite and molten potassium

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Product

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”Eau de graphene” from a KC₈ graphite intercalation compound prepared by a simple mixing of graphite and molten potassium