Instituto de Nanociencia y Materiales de Aragón (INMA), CSIC-Universidad de Zaragoza, Zaragoza 50009, Spain.
IMDEA Nanociencia C/Faraday 9 Ciudad Universitaria de Cantoblanco, 28049 Madrid, Spain.
ACS Nano. 2023 Mar 28;17(6):5984-5993. doi: 10.1021/acsnano.3c00280. Epub 2023 Mar 14.
2D materials display exciting properties in numerous fields, but the development of applications is hindered by the low yields, high processing times, and impaired quality of current exfoliation methods. In this work we have used the excellent MW absorption properties of MoS to induce a fast heating that produces the near-instantaneous evaporation of an adsorbed, low boiling point solvent. The sudden evaporation creates an internal pressure that separates the MoS layers with high efficiency, and these are kept separated by the action of the dispersion solvent. Our fast method (90 s) gives high yields (47% at 0.2 mg/mL, 35% at 1 mg/mL) of highly exfoliated material (90% under 4 layers), large area (up to several μm), and excellent quality (no significant MoO detected).
二维材料在众多领域表现出令人兴奋的特性，但目前的剥离方法产量低、加工时间长且质量受损，这阻碍了其应用的发展。在这项工作中，我们利用 MoS 优异的微波吸收特性来引发快速加热，从而实现吸附的低沸点溶剂的瞬时蒸发。突然的蒸发会产生内部压力，从而高效率地分离 MoS 层，而分散溶剂则会保持这些层的分离。我们的快速方法（90 秒）可得到高产率（0.2mg/ml 时为 47%，1mg/ml 时为 35%）的高度剥离材料（90%低于 4 层），大面积（可达数 μm）和优异的质量（未检测到明显的 MoO）。
