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Exfoliation in Bags Using Sonication for Nanomaterials Synthesis
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With the discovery of the amazing properties of graphene a wide range of applications were
devised for this material. Due to the foreseeable great demand for graphene, new materials
with similar properties, cheaper and of wider availability had to be studied. Molybdenum
Disulfide, MoS2, is one of the members of the transition metal dichalcogenides. When this
material is in a single-layer disposition it presents very interesting properties for optical
and electronic applications. Many of those applications complement areas where graphene
is not useful. However, to obtain the MoS2 mono-layers it is necessary to exfoliate this
material. Currently the available exfoliation procedures lack the simplicity and the desired
scalability for industrial porpuses.
With this project is attempted to use the BuBclean Cavitation Intensifying Bags or CIBs
to exfoliate MoS2. The applicability of plain bags and bags with pits will be tested, as
well as to which ultrasonic equipment better suits for this new setup. Understanding what
cavitation effects cause the material exfoliation is another objective of this project. For that,
the mechanical and chemical effects from cavitation will be isolated and the different results
compared. In an important analysis will be studied if the BuBclean CIBs are prepared to
sustain the intense effects from cavitation.
It was verified that the bags with pits generate very intense cavitation slightly damaging
the obtained layers of MoS2. The plain bags showed better yields as well as less damaged
flakes. The mechanical effects from cavitation proved to be the main factor in the exfoliation
process, but lead to the formation of damaged flakes in the long run. The chemical
effects on their own, manage to produce some exfoliated MoS2. The BuBclean CIBs showed
proper resistance to cavitation but also leaked when the temperature in the bath increased
with time. Further studies must be done to understand if this is viable upgrade to the
exfoliation process.
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Palavras-chave
Exfoliation Molybdenum Disulfide Cavitation BuBclean CIB