Study on the anti-aggregation mechanism of graphene/MoS2 self-crosslinked composite dispersion induced by hydroxyl radicals.

Abstract

In this study, a self-crosslinked graphene/molybdenum disulfide (Gr/MoS2) composite dispersion was successfully prepared using a one-step method that combines hydroxyl radical (˙OH) induction and Na2SO4 electrolyte modulation. The surface modification mechanism of Gr/MoS2 nanosheets by hydroxyl radicals and the regulatory role of inorganic salts were systematically investigated. Transmission electron microscopy (TEM) revealed that MoS2 nanosheets were successfully crosslinked onto graphene. X-ray photoelectron spectroscopy (XPS) and Fourier-transform infrared spectroscopy (FTIR) further confirmed that ˙OH induced the formation of covalent S-C bonds between graphene and sulfur vacancies on the MoS2 surface, thus constructing a self-crosslinked network. The ˙OH species oxidatively introduce oxygen-containing functional groups, while the inorganic salts compress the electrical double layer thickness. This dual action creates a crosslinking-conducive environment for the materials, promoting covalent bonding and simultaneously suppressing agglomeration. The prepared dispersion exhibited a polydispersity index (PDI) of 0.114 and a zeta potential of -46.32 mV, maintaining good dispersion even after 120 days of storage. Based on these findings, a novel triadic mechanism, "˙OH oxidation-induced inorganic salt-regulated self-crosslinking", is proposed, providing a new strategy for the efficient dispersion and functional integration of two-dimensional materials.

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