Supercritical carbon dioxide (SC CO 2 ) has shown great potential in fabrication of two-dimensional (2D) amorphous nanomaterials with excellent electric and optical properties, while the amorphization mechanism led by SC CO 2 is still unclear. In this work, by investigating the amorphization kinetics of MoO 3−x nanomaterials in SC CO 2 , we find two amorphization mechanisms dependent on the SC CO 2 pressure. At lower pressure, forming oxygen vacancies is the dominant effect, while at higher pressure, atomic rearrangement is the controlling factor. Furthermore, we demonstrate that amorphization directly affects the optical performance of MoO 3−x nanosheets because of the change in coordination, which further indicates the atomic rearrangement during the amorphization process. Therefore, this work reveals the amorphization mechanism led by SC CO 2 and builds a link between amorphization and optical performance; it also provides new inspiration for fabrication of amorphous nanomaterials with tunable optical and photocatalytic performance.
Supercritical CO2 has
shown great potential in the top-down
fabrication of two-dimensional (2D) amorphous nanomaterials. However,
a few works focus on the SC CO2-assisted synthesis of 2D
amorphous nanomaterials by a bottom-up approach. Here we report the
facile bottom-up synthesis of 2D amorphous MoO3–x
nanosheets, using SC CO2 as a surface
confining agent. Moreover, the morphology of the MoO3–x
can be tailored by simply adjusting the pressure
of the SC CO2. The as-prepared 2D amorphous MoO3–x
nanosheets exhibit enhanced surface plasma resonance
in the visible and near-infrared regions, showing outstanding photothermal
conversion performance. This work constructs a new approach for the
preparation of 2D amorphous nanosheets, throwing light on the amorphization
mechanism of 2D materials.
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