Ultrathin 2D Rare-Earth Nanomaterials: Compositions, Syntheses, and Applications.

Ultrathin 2D nanomaterials possess promising properties due to electron confinement within single or a few atom layers. As an emerging class of functional materials, ultrathin 2D rare-earth nanomaterials may incorporate the unique optical, magnetic, and catalytic behaviors of rare-earth elements into layers, exhibiting great potential in various applications such as optoelectronics, magnetic devices, transistors, high-efficiency catalysts, etc. Despite its importance, reviews on ultrathin 2D rare-earth nanomaterials or related topics are rare and only focus on a certain family of ultrathin 2D rare-earth nanomaterials. This work is the first comprehensive review in this impressive field, which covers all families of ultrathin 2D rare-earth nanomaterials, illustrating their compositions, syntheses, and applications. After summarizing the current achievements, the challenges and opportunities of future research on ultrathin 2D rare-earth nanomaterials are evaluated.