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

Abstract

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.

CO2‐Assisted Fabrication of 2D Amorphous CeO2 and Its Application in Photoluminescence Enhancement

“…It should be point out that the V O to L O molar ratio in SC‐60 CeO 2− x (9.9) is higher than that in SC‐100 CeO 2− x (6.4), which is due to the thicker samples have less surface to interact with CO 2 molecules at higher temperature. This point has been proposed in our previous reports [6] …”

Supercritical CO2‐assisted Fabrication of Two‐dimensional Graphdiyne Oxide Nanosheets for Enhanced Photothermal Conversion

“…Based on the driving forces stemming from the phase inversion, graphene and graphene analogues such as BN, MoO 3 , WO 3 , MoS 2 , WS 2 , layers can be efficiently exfoliated from their corresponding bulk phases [29–31] . Importantly, the 2D few‐layered materials can be transformed into oxides through thermodynamically preferred surface oxidation, which can form novel nanostructure such as heterostructure, further improving their utilization rates of light and catalytic activities [32–36] . Therefore, supercritical CO 2 is potential for large‐scale preparation of graphdiyne oxide nanosheets in research and industry by top‐down processing.…”

Enabling room-temperature reductive C–N coupling of nitroarenes: combining homogeneous and heterogeneous synergetic catalyses mediated by light

“…In particularly, MoO 3 is capable of acting as a semiconductor that responds to light to form a particular photothermal activity by plasmonic effects, which could cause enhanced synthetic efficiency. 35–37 The bulky α-MoO 3 -B was first prepared from commercial ammonium molybdate precursors by calcination under 550 °C. The α-MoO 3 -S nanosheets were further obtained by exfoliating the bulky α-MoO 3 -B (Scheme S1†).…”