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Solution-processed multifunctional graphene and Graphene/MoS2 heterostructure films 
Auteur(s): Bepete George, Escobar Colón Ámbar, Ratnayake Gothamie, Dimitrov Edgar, Kammarchedu Vinay, Carreno Andres Fest, Lei Yu, Fujisawa Kazunori, Perea-Lopez Nestor, Voiry Damien, Ebrahimi Aida, Anglaret E., Pénicaud Alain, Drummond Carlos, Terrones Mauricio
(Article) Publié:
Carbon, vol. 238 p.120220 (2025)
Ref HAL: hal-05009964_v1
DOI: 10.1016/j.carbon.2025.120220
Exporter : BibTex | endNote
Résumé: We present a scalable solution-processing method for fabricating high-quality graphene and graphene/1T-MoS2 heterostructure films. The process begins with the synthesis of potassiumintercalated graphite (KC8), which is exfoliated in tetrahydrofuran (THF) to produce stable dispersions of negatively charged (electron rich) graphene sheets. The graphene is subsequently transferred to water, forming a surfactant-free aqueous dispersion suitable for creating homogenous graphene films via vacuum filtration and stamping. Additionally, graphene is combined with 1T-MoS2 nanosheets to fabricate graphene/1T-MoS2 bulk heterostructure films. Comprehensive characterization, including X-ray diffraction (XRD), absorption spectroscopy, scanning electron microscopy (SEM), transmission electron microscopy (TEM), Raman spectroscopy, and X-ray photon emission spectroscopy (XPS), reveals that the heterostructure films exhibit enhanced optical and electronic properties, including improved light absorption, which could lead to novel photo-responsive devices. Raman spectroscopy shows significant changes in the graphene's structural and electronic properties upon interaction with MoS2, indicating strong interlayer coupling and potential charge transfer between the layered components. The graphene films demonstrate highly sensitive detection of dopamine (DA), while the graphene/1T-MoS2 bulk heterostructure films exhibit capacitance values up to 38.3 Fg -1 at 5 mV s -1 in non-aqueous electrolytes. These results highlight the potential of these films for advanced applications in molecular sensing and energy storage.
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