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Impact of Covalent Functionalization on the Aqueous Processability, Catalytic Activity, and Biocompatibility of Chemically Exfoliated MoS2 Nanosheets
journal contribution
posted on 2016-10-05, 17:20 authored by Juan I. Paredes, José
M. Munuera, Silvia Villar-Rodil, Laura Guardia, Miguel Ayán-Varela, Ana Pagán, Salvador D. Aznar-Cervantes, José L. Cenis, Amelia Martínez-Alonso, Juan M. D. TascónChemically 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.
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stabilityhydrothermal annealing procedurecell proliferation testschemical derivatizationmaterialce-MoS 2benefitacetic acid groupsChemically Exfoliated MoS 2 Nanosheets Chemically exfoliated MoS 2chemical modification strategiesce-MoS 2 nanosheetsacetic acid-functionalized nanosheetschemical exfoliation step1 T phase2 H phaseMoS 2 unit
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