Overcoming Challenges in Colloidal and Chemical Stability of Graphene Oxide with Exploration of Dispersing Solvent.

Graphene oxide (GO) offers immense potential across various applications, but its chemical and dispersion instabilities remain critical challenges. In this study, the role of solvent selection is investigated in enhancing the dispersion and chemical stability of GO after ripening. Through comprehensive characterization techniques, including rheology, SAXS, DLS, and SEM, it is demonstrated that solvents such as N-Methyl-2-Pyrrolidinone (NMP), dimethylformamide (DMF), and dimethyl sulfoxide (DMSO) effectively maintain the colloidal stability of GO by mitigating gelation and flocculation, attributed to their favorable interactions with the graphitic domains. Notably, ethylene glycol (EG) exhibited superior chemical stability by inhibiting the diffusion of functional groups and preventing reduction even at elevated temperatures (up to 145 °C). The findings emphasize the influence of solvent selection on GO's microstructure, rheological properties, and thermal stability during ripening, thereby contributing to enhancing the longevity of GO-based materials.