Universal strategy for reversing aging and defects in graphene oxide for highly conductive graphene aerogels

0572518 - FZÚ 2024 RIV US eng J - Článek v odborném periodiku
Kumar, Prabhat - Šilhavík, Martin - Zafar, Zahid Ali - Červenka, Jiří
Universal strategy for reversing aging and defects in graphene oxide for highly conductive graphene aerogels.
Journal of Physical Chemistry C. Roč. 127, č. 22 (2023), s. 10599-10608. ISSN 1932-7447. E-ISSN 1932-7455
Grant CEP: GA MŠMT(CZ) EF16_019/0000760; GA ČR(CZ) GA23-05895S
Grant ostatní: OP VVV - SOLID21(XE) CZ.02.1.01/0.0/0.0/16_019/0000760
Institucionální podpora: RVO:68378271
Klíčová slova: graphene * graphene oxide * aerogels * aging * defects
Obor OECD: Nano-materials (production and properties)
Impakt faktor: 3.7, rok: 2022
Způsob publikování: Open access

Here, we report a universal strategy to reverse the aging of graphene oxide precursors using oxygen plasma treatment. This treatment decreases the size of graphene oxide flakes and restores negative zeta potential and suspension stability in water, enabling the fabrication of compact and mechanically stable graphene aerogels using hydrothermal synthesis. Moreover, we employ high-temperature annealing to remove oxygen-containing functionalities and repair the lattice defects in reduced graphene oxide. This method allows obtaining highly electrically conducting graphene aerogels with electrical conductivity of 390 S/m and low defect density. The role of carboxyl, hydroxyl, epoxide, and ketonic oxygen species is thoroughly investigated using X-ray photoelectron and Raman spectroscopies. Our study provides unique insight into the chemical transformations occurring during the aging and thermal reduction of graphene oxide from room temperature up to 2700 °C.
Trvalý link: https://hdl.handle.net/11104/0343573