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

0572518 - FZÚ 2024 RIV US eng J - Journal Article
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
R&D Projects: GA MŠMT(CZ) EF16_019/0000760; GA ČR(CZ) GA23-05895S
Grant - others:OP VVV - SOLID21(XE) CZ.02.1.01/0.0/0.0/16_019/0000760
Institutional support: RVO:68378271
Keywords : graphene * graphene oxide * aerogels * aging * defects
OECD category: Nano-materials (production and properties)
Impact factor: 3.7, year: 2022
Method of publishing: 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.
Permanent Link: https://hdl.handle.net/11104/0343573