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Impact of Covalent Functionalization on the Aqueous Processability, Catalytic Activity, and Biocompatibility of Chemically Exfoliated MoS2 Nanosheets

AutorParedes Nachón, Juan Ignacio ; Munuera Fernández, José María ; Villar Rodil, Silvia ; Guardia, Laura ; Ayán Varela, Miguel; Pagán, Ana; Aznar-Cervantes, Salvador; Cenis, José L.; Martínez Alonso, Amelia ; Díez Tascón, Juan Manuel
Palabras claveMoS2
Two-dimensional material
Transition metal dichalcogenides (TMDs)
Colloidal dispersion
Metal nanoparticles
Ccatalytic reduction
Fecha de publicación5-oct-2016
EditorAmerican Chemical Society
CitaciónACS Applied Materials and Interfaces 8(41): 27974–27986 (2016)
ResumenChemically exfoliated MoS2 (ce-MoS2) has emerged in recent years as an attractive two-dimensional material for use in relevant technological applications, but fully exploiting its potential and versatility will most probably require the deployment of appropriate chemical modification strategies. Here, we demonstrate that extensive covalent functionalization of ce-MoS2 nanosheets with acetic acid groups (∼0.4 groups grafted per MoS2 unit) based on the organoiodide chemistry brings a number of benefits in terms of their processability and functionality. Specifically, the acetic acid-functionalized nanosheets were furnished with long-term (>6 months) colloidal stability in aqueous medium at relatively high concentrations, exhibited a markedly improved temporal retention of catalytic activity toward the reduction of nitroarenes, and could be more effectively coupled with silver nanoparticles to form hybrid nanostructures. Furthermore, in vitro cell proliferation tests carried out with murine fibroblasts suggested that the chemical derivatization had a positive effect on the biocompatibility of ce-MoS2. A hydrothermal annealing procedure was also implemented to promote the structural conversion of the functionalized nanosheets from the 1T phase that was induced during the chemical exfoliation step to the original 2H phase of the starting bulk material, while retaining at the same time the aqueous colloidal stability afforded by the presence of the acetic acid groups. Overall, by highlighting the benefits of this type of chemical derivatization, the present work should contribute to strengthen the position of ce-MoS2 as a two-dimensional material of significant practical utility.
Versión del editorhttp://dx.doi.org/10.1021/acsami.6b08444
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