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

0567649 - ÚFCH JH 2024 RIV DE eng J - Článek v odborném periodiku
Thakur, Mukesh Kumar - Haider, Golam - Farjana, Jaishmin Sonia - Plšek, Jan - Rodriguez, Álvaro - Mishra, V. - Panda, Jaganandha - Gedeon, O. - Mergl, Martin - Volochanskyi, Oleksandr - Valeš, Václav - Frank, Otakar - Vejpravová, J. - Kalbáč, Martin
Isotope Engineered Fluorinated Single and Bilayer Graphene: Insights into Fluorination Selectivity, Stability, and Defect Passivation.
Small. Roč. 19, č. 12 (2023), č. článku 2205575. ISSN 1613-6810. E-ISSN 1613-6829
Grant CEP: GA MŠMT EF16_026/0008382; GA ČR(CZ) GX20-08633X
Grant ostatní: Ministerstvo školství, mládeže a tělovýchovy - GA MŠk(CZ) CZ.02.1.01/0.0/0.0/16_026/0008382
Institucionální podpora: RVO:61388955
Klíčová slova: defect passivation * fluorination * graphene * in situ Raman spectroscopy * isotopes * ultra-fast phototransistors
Obor OECD: Physical chemistry
Impakt faktor: 13.3, rok: 2022
Způsob publikování: Omezený přístup

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 fluorination-induced defects in graphene layers. The structural, electronic and isotope-mass-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 co-shared 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 mu s. Thus, the study paves a new avenue for the in-depth understanding and practical utilization of fluorinated graphenic carbon.
Trvalý link: https://hdl.handle.net/11104/0338873