The use of sample positioning to control defect creation by oxygen plasma in isotopically labelled bilayer graphene membranes

Guerra, Valentino L. P.; Valeš, Václav; Mikšátko, Jiří; Plšek, Jan; Drogowska-Horná, Karolina; Volochanskyi, Oleksandr; Kalbáč, Martin

doi:10.1039/d1ra01249e

Cited by 3 publications

(2 citation statements)

References 28 publications

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“…Let us now analyze the Raman spectra obtained from the prepared layers. The phonon energy is inversely proportional to the mass of the vibrating atoms, that is,

\Gamma \; \approx 1{\rm{/}}\sqrt m .

[ 37,41 ] Thus, the Raman modes are sensitive to the presence of isotopes in the vibrating atoms. As a result, the isotopically labeled 12 CGr and 13 CGr single‐ and bilayer graphene provide a unique platform to analyze defects produced at the fluorination sites of different layers in 13 CGr/ F‐ 12 CGr or the converse bilayer.…”

Section: Resultsmentioning

confidence: 99%

Isotope Engineered Fluorinated Single and Bilayer Graphene: Insights into Fluorination Selectivity, Stability, and Defect Passivation

Thakur

Haider

Sonia

et al. 2023

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Tailoring the physicochemical properties of graphene through functionalization remains a major interest for next-generation technological applications. However, defect formation due to functionalization greatly endangers the intrinsic properties of graphene, which remains a serious concern. Despite numerous attempts to address this issue, a comprehensive analysis has not been conducted. This work reports a two-step fluorination process to stabilize the fluorinated graphene and obtain control over the fluorinationinduced defects in graphene layers. The structural, electronic and isotopemass-sensitive spectroscopic characterization unveils several not-yet-resolved facts, such as fluorination sites and CF bond stability in partially-fluorinated graphene (F-SLG). The stability of fluorine has been correlated to fluorine coshared between two graphene layers in fluorinated-bilayer-graphene (F-BLG). The desorption energy of co-shared fluorine is an order of magnitude higher than the CF bond energy in F-SLG due to the electrostatic interaction and the inhibition of defluorination in the F-BLG. Additionally, F-BLG exhibits enhanced light-matter interaction, which has been utilized to design a proof-of-concept field-effect phototransistor that produces high photocurrent response at a time <200 µs. Thus, the study paves a new avenue for the indepth understanding and practical utilization of fluorinated graphenic carbon.

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“…Let us now analyze the Raman spectra obtained from the prepared layers. The phonon energy is inversely proportional to the mass of the vibrating atoms, that is,

\Gamma \; \approx 1{\rm{/}}\sqrt m .

Section: Resultsmentioning

confidence: 99%

Isotope Engineered Fluorinated Single and Bilayer Graphene: Insights into Fluorination Selectivity, Stability, and Defect Passivation

Thakur

Haider

Sonia

et al. 2023

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“…Physical (photo/electron/plasma) etching has been employed for the creation of mesoporous mono/multi-layer graphene. For example, Guerra et al reported controllable defect creation in isotopically labeled bilayer graphene through oxygen plasma treatment [62]. The high-resolution transmission electron microscopy (HRTEM) confirmed randomly distributed holes of a few nanometers, namely the vacancy defects caused by the oxygen plasma.…”

Section: Disordered Mesoporous Graphenementioning

confidence: 99%

Recent Advances in Graphene-Based Mesoporous Nanosheets for Supercapacitors

Bo,

Zhang,

Yin

et al. 2023

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Among typical energy storage devices, supercapacitors play a predominant role in industry and our life owing to their rapid charge/discharge rate, superior lifespan, high power density, low cost, and outstanding safety. However, their low energy density has severely hindered their further development. For active electrode materials, graphene-based mesoporous nanosheets (GMNs) can combine the advantages from graphene and mesoporous materials, which can be applied to significantly enhance the energy density of supercapacitors. Here, we review the recent advances in GMNs for supercapacitors, focusing on in-plane mesoporous graphene and sandwich-like graphene-based heterostructures. Firstly, the synthesis of in-plane mesoporous graphene with ordered and disordered mesopores for supercapacitors is introduced. Secondly, sandwich-like graphene-based heterostructures are classified into mesoporous carbon/graphene, mesoporous heteroatom-doped carbon/graphene, mesoporous conducting polymer/graphene, and mesoporous metal oxide/graphene, and their applications in supercapacitors are discussed in detail. Finally, the challenges and opportunities of GMNs for high-performance supercapacitors are proposed.

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Theoretical study of the adsorption of lithium, sodium and potassium on pyridine

Denis

2021

Chemical Physics Letters

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The use of sample positioning to control defect creation by oxygen plasma in isotopically labelled bilayer graphene membranes

Abstract: Monolayer and isotopically labelled bilayer graphene membranes were prepared on grids for transmission electron microscopy (TEM).

Cited by 3 publications

References 28 publications

Isotope Engineered Fluorinated Single and Bilayer Graphene: Insights into Fluorination Selectivity, Stability, and Defect Passivation

Isotope Engineered Fluorinated Single and Bilayer Graphene: Insights into Fluorination Selectivity, Stability, and Defect Passivation

Recent Advances in Graphene-Based Mesoporous Nanosheets for Supercapacitors

Theoretical study of the adsorption of lithium, sodium and potassium on pyridine

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