10.1021/acsami.6b08444.s001
Juan I. Paredes
Juan I.
Paredes
José
M. Munuera
José
M.
Munuera
Silvia Villar-Rodil
Silvia
Villar-Rodil
Laura Guardia
Laura
Guardia
Miguel Ayán-Varela
Miguel
Ayán-Varela
Ana Pagán
Ana
Pagán
Salvador D. Aznar-Cervantes
Salvador D.
Aznar-Cervantes
José L. Cenis
José L.
Cenis
Amelia Martínez-Alonso
Amelia
Martínez-Alonso
Juan M. D. Tascón
Juan
M. D. Tascón
Impact
of Covalent Functionalization on the Aqueous Processability, Catalytic
Activity, and Biocompatibility of Chemically Exfoliated MoS<sub>2</sub> Nanosheets
American Chemical Society
2016
stability
hydrothermal annealing procedure
cell proliferation tests
chemical derivatization
material
ce-MoS 2
benefit
acetic acid groups
Chemically Exfoliated MoS 2 Nanosheets Chemically exfoliated MoS 2
chemical modification strategies
ce-MoS 2 nanosheets
acetic acid-functionalized nanosheets
chemical exfoliation step
1 T phase
2 H phase
MoS 2 unit
2016-10-05 17:20:47
Journal contribution
https://acs.figshare.com/articles/journal_contribution/Impact_of_Covalent_Functionalization_on_the_Aqueous_Processability_Catalytic_Activity_and_Biocompatibility_of_Chemically_Exfoliated_MoS_sub_2_sub_Nanosheets/3985776
Chemically exfoliated MoS<sub>2</sub> (ce-MoS<sub>2</sub>) 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-MoS<sub>2</sub> nanosheets with acetic acid groups (∼0.4
groups grafted per MoS<sub>2</sub> 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-MoS<sub>2</sub>. 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-MoS<sub>2</sub> as a two-dimensional material of significant practical utility.