Directly observable G band splitting in Raman spectra from individual tubular graphite cones

Shang, N. G.; Silva, S. Ravi P.; Jiang, Xiaotong; Papakonstantinou, Pagona

doi:10.1016/j.carbon.2011.03.025

Cited by 13 publications

(4 citation statements)

References 32 publications

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“…The dipole moment generated from the charge transfer between graphene sheets and adsorbed F-atoms can also break the stacking symmetry and result in G-band splitting. [30,31] The existence of the CF bond in P-FGCF is revealed in the XPS of cycled P-FGCF further corroborates this claim. The occurrence of CF bond formation is a likely phenomenon, whenever salt anion ( − PF 6 ) decomposes as LiPF 6 is the only source of fluorine in the system.…”

Section: Postprocessing Studies Of P-cfs After Electrochemical Cyclingsupporting

confidence: 67%

Multifunctional Utilization of Pitch‐Coated Carbon Fibers in Lithium‐Based Rechargeable Batteries

Ghosh

Bhattacharjee

Sivaraman

et al. 2021

Advanced Energy Materials

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This work reports carbon fibers as an electrode material and current collector for dual‐carbon and lithium‐ion batteries. Fully graphitic and semigraphitic carbon fibers undergo anion intercalation beyond 4.5 V versus Li/Li+. Symmetric dual‐carbon full cells using a pitch‐coated fully graphitic carbon fiber mat as both cathode and anode delivers an energy‐density of 276 and 322 Wh kg−1 at 342 W kg−1 power density in the voltage range of 3.0–5.0 and 3.0–5.2 V, respectively. On the other hand, nongraphitic carbon fibers do not exhibit anion intercalation up to 5.2 V and can be used as a current collector. They also possess a larger number of Li+ storage sites in their randomly oriented microstructure when used as an anode. A lithium‐ion full cell with double carbon‐coated C‐LiFePO4 loaded on nongraphitic carbon fiber as a cathode and pitch‐coated nongraphitic carbon fiber as an anode exhibits 202.6 and 75.2 Wh kg−1 energy density at power densities of 46.75 W kg−1 and 11.7 kW kg−1, respectively in 2.0–3.5 V range. This pitch‐coated carbon fiber‐based battery configuration eliminates the need for metal foils and costly fluorinated binders, lowers overall weight of the cell, and is capable of sustaining mechanical stress and thermal shock.

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Section: Postprocessing Studies Of P-cfs After Electrochemical Cyclingsupporting

confidence: 67%

Multifunctional Utilization of Pitch‐Coated Carbon Fibers in Lithium‐Based Rechargeable Batteries

Ghosh

Bhattacharjee

Sivaraman

et al. 2021

Advanced Energy Materials

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“…The average particle size was found to be around 200 nm, with a very low BET surface area of 29.6354 m 2 /g, suggesting that a proper treatment for catalyst removal should be done to enhance its surface adsorption properties [3]. materials, such as diamond, CNT, fullerene, graphene and graphite etc [8]. The first peak, D-band found at 1361.64 cm − 1 was attributed to the presence of disordered amorphous carbon, not from defects in the tube walls.…”

Section: Resultsmentioning

confidence: 99%

Synthesis and Characterization of Mesoporous Multi-Walled Carbon Nanotubes at Low Frequencies Electromagnetic Waves

Soleimani

Yahya

Latiff

et al. 2013

JNanoR

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For electromagnetic absorbing and shielding applications, carbon nanotubes (CNT) are widely used due to their excellent electrical and physical properties. Fabrication of microwave absorbing materials involves the use of compounds capable of generating dielectric and/or magnetic losses when impinged by an electromagnetic wave. The presence of lattice defects e.g. vacancies and dislocations contributes to the loss and attenuation in the electromagnetic waves, which in turn remarkably enhance the absorption ability of the material. With the CVD technique which is known to produce several lattice defects in the final product, aligned MWCNTs were successfully synthesized by pyrolizing toluene and ferrocene in an inert argon environment. The morphology analysis of the aligned MWCNTs was conducted via FESEM and TEM analysis, to reveal the average length of approximately 295 μm, with diameters in the range of 60-200 nm. EDS analysis indicates the high yield of CNTs, with more than 90% in weight composition, with less than 5 % Fe impurities presence. Textural properties of MWCNTs were studied by measuring pore size and BET surface area. To understand the response of CNTs to an electromagnetic field, permeability and permittivity measurement were conducted in the frequency range of 100 Hz to 110 MHz. In conclusion, the presence of defects in MWCNTs is desirable for enhanced electromagnetic absorption ability.

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“…Meanwhile, we should also consider the effect of tube's chirality because the G band in semiconducting and metallic SWCNTs is affected by the tube's chirality . Shang et al . have discovered that the splitting of G band of an individual tubular graphite cones varies as the number of constituent graphene sheets change, even the tubular graphite cones have preferential zigzag monochirality.…”

Section: Resultsmentioning

confidence: 99%

Surface‐enhanced Raman spectra of individual multiwalled carbon nanotubes with small innermost diameters

Hou

Sheng

et al. 2012

J Raman Spectroscopy

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The Raman spectra of individual multiwalled carbon nanotubes (MWCNTs) with the innermost diameters of 0.6-0.9 nm are studied by surface-enhanced Raman scattering. The influences of small innermost diameters to Raman features are investigated. A clear and relatively sharp Raman peak appears at 1510 cm À1 when the innermost diameter is close to 0.6 nm. Lorentzian fits of G band indicate that its splitting is affected by the small innermost diameter of MWCNT. Moreover, the splitting of 2iTO mode is also observed at 2800-3000 cm À1 .

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Directly observable G band splitting in Raman spectra from individual tubular graphite cones

Cited by 13 publications

References 32 publications

Multifunctional Utilization of Pitch‐Coated Carbon Fibers in Lithium‐Based Rechargeable Batteries

Multifunctional Utilization of Pitch‐Coated Carbon Fibers in Lithium‐Based Rechargeable Batteries

Synthesis and Characterization of Mesoporous Multi-Walled Carbon Nanotubes at Low Frequencies Electromagnetic Waves

Surface‐enhanced Raman spectra of individual multiwalled carbon nanotubes with small innermost diameters

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