CO₂-Assisted Synthesis of 2D Amorphous MoO_3- Nanosheets: From Top-Down to Bottom-Up

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 MoO_3- nanosheets, using SC CO₂ as a surface confining agent. Moreover, the morphology of the MoO_3- can be tailored by simply adjusting the pressure of the SC CO₂. The as-prepared 2D amorphous MoO_3- 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.