Accurate Control of VS₂ Nanosheets for Coexisting High Photoluminescence and Photothermal Conversion Efficiency

Abstract

In two‐dimensional (2D) amorphous nanosheets, the electron–phonon coupling triggered by localization of the electronic state as well as multiple‐scattering feature make it exhibit excellent performance in optical science. VS2 nanosheets, especially single‐layer nanosheets with controllable electronic structure and intrinsic optical properties, have rarely been reported owing to the limited preparation methods. Now, a controllable and feasible switching method is used to fabricate 2D amorphous VS2 and partial crystallized 2D VO2(D) nanosheets by altering the pressure and temperature of supercritical CO2 precisely. Thanks to the strong carrier localization and the quantum confinement, the unique 2D amorphous structures exhibit full band absorption, strong photoluminescence, and outstanding photothermal conversion efficiency.

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.…”

CO2-Assisted Synthesis of 2D Amorphous MoO3–x Nanosheets: From Top-Down to Bottom-Up

“…Thanks to the nearly zero surface tension, high diffusion coefficients, excellent surface wetting, strong solvating effect, − as well as the nontoxic and readily available characteristics, supercritical CO 2 (SC CO 2 ) holds great promise in fabricating 2D amorphous nanomaterials by a green and environmentally friendly approach . In our previous studies, SC CO 2 has the capability to exfoliate the bulk materials by weakening the van der Waals interaction between adjacent layers. − Meanwhile, SC CO 2 , with the destructive effect on the intralayer bonds, is believed to break the periodic symmetry of crystal and results in 2D amorphous nanomaterials with unique properties . However, these reported studies are mainly based on the top-down approach, and few works , focus on the effect of SC CO 2 on the bottom-up synthesis of the 2D amorphous nanomaterials.…”

Supercritical CO2‐Tailored 2D Oxygen‐doped Amorphous Carbon Nitride for Enhanced Photocatalytic Activity

“…[24,25] In our previous work, SC CO 2 can not only successfully exfoliate various layered materials into 2D nanosheets, [26,27] also achieve phase transformation, [28] heteroatom doping, [29] lateral and vertical heterostructure construction, [30][31][32][33] as well as 2D amorphous materials fabrication. [34][35][36] In this context, 2D O-doped amorphous g-C 3 N 4 nanosheets tailored by SC CO 2 have been first achieved in this work. Impressively, the introduction of SC CO 2 not only led to 2D amorphous structure but also created heteroatom O-doping in the C 3 N 4 skeleton, which caused intriguing optical and electronic properties.…”