Synthesis Strategies about 2D Materials

Abstract

In recent years, more and more attentions have been paid to two-dimensional D materials due to the excellent electrical, optical, thermal and mechanical properties. To characterize the layer-dependent changes in properties and to provide pathways for their integration into a multitude of applications, it is essential to explore the reliable syntheses of single-and few-layer D materials. Therefore, many strategies, such as micromechanical exfoliation, ultrasonic exfoliation, hydrothermal method, topochemical transformation, chemical vapor deposition method and so on, have been developed to synthesize high-quality and ultrathin nanosheets showing their own merits and demerits in preparing D nanomaterials. Herein, an overview of the recent progress in the synthetic techniques is presented for D materials, in which we would introduce their experimental scheme, advantages and disadvantages, and applications of these synthetic strategies. Eventually, the potential trends and future directions for synthesizing technology for D materials are proposed.

Emergence of Novel 2D Materials for High-Performance Supercapacitor Electrode Applications: A Brief Review

“…136 Many strategies, such as mechanical exfoliation (scotch tape technique), liquid exfoliation, wet chemical strategy, microwave-assisted method, and chemical vapor deposition, have been employed to synthesize high-quality ultrathin nanosheets. 137,138 Mechanical exfoliation or the scotch tape technique was the one of the successful method used by Rao et al 137 and Wang et al 138 for generating single-layer graphene. The scotch tape method refers to synthesizing a high-quality thin layer of 2D material from bulk counterparts, which keeps the material's pristine structure and intrinsic properties.…”

“…This method allows the synthesis of various 2D nanomaterials such as graphene, h-BN, and TMDs. 138 The efficiency of the CVD technique is much higher than that of mechanical exfoliation, and quality is better than liquid-phase methods. 150 CVD is a high-temperature chemical synthesis method in which the desired material is deposited on a required substrate.…”

“…150 CVD is a high-temperature chemical synthesis method in which the desired material is deposited on a required substrate. 138 Even though it allows large-scale and high purity production, it requires a high vacuum temperature atmosphere, and also, the process is very complicated and expensive, limiting its practical application. 151 Wang et al reported the first large-scale synthesis of few-layered graphene sheets by CVD of methane over cobalt supported on magnesium oxide at 1000 °C in an Ar atmosphere.…”

“…Also, we get precise control over the composition and different reaction parameters through hydro/solvothermal synthesis. 138,160 In a typical hydro/solvothermal process, water or an organic solvent acts as a reaction medium in a special closed reaction vessel to create a high-temperature, high-pressure reaction environment by heating the reaction system and pressurizing it. 155,161,162 Many reports have been published on the hydro/solvothermalbased synthesis of 2D nanomaterials.…”

Introducing Magnetism into 2D Nonmagnetic Inorganic Layered Crystals: A Brief Review from First-Principles Aspects

“…Compared to numerous devotions in the synthesis of large-scale 2D ILCs [113,114], experimental realizations of magnetic ILCs are rarely reported. Despite sophisticated synthetic routes to combine various metals with the ILCs, our key aim is not focused on 2D spintronic materials [115].…”