Two-Dimensional Nanomaterials with Unconventional Phases

Abstract

Challenges and opportunities: • Although some unconventional phases that differ from the thermodynamically stable phases in bulks have been realized in 2D nanostructures, the rational design and controlled synthesis of 2D nanomaterials with unconventional phases are still challenging. It is urgently necessary to develop general synthetic strategies to prepare 2D nanomaterials with desired phases and morphologies. • From the mechanism point of view, it is of great importance to conduct systematic studies to gain the fundamental understanding toward the formation and stabilization of unconventional phases as well as the phase transformation process. • The relationship between the phase and property of 2D nanomaterials still remains vague. Further efforts should be devoted to unravel the phase-property relationship and phase-dependent applications on the basis of systematically experimental and theoretical investigations.