Review of strategies toward the development of alloy two-dimensional (2D) transition metal dichalcogenides

Abstract

Summary Atomically thin two-dimensional (2D) transition metal dichalcogenides (TMDCs) have attracted significant attention owing to their prosperity in material research. The inimitable features of TMDCs triggered the emerging applications in diverse areas. In this review, we focus on the tailored and engineering of the crystal lattice of TMDCs that finally enhance the efficiency of the material properties. We highlight several preparation techniques and recent advancements in compositional engineering of TMDCs structure. We summarize different approaches for TMDCs such as doping and alloying with different materials, alloying with other 2D metals, and scrutinize the technological potential of these methods. Beyond that, we also highlight the recent significant advancement in preparing 2D quasicrystals and alloying the 2D TMDCs with MAX phases. Finally, we highlight the future perspectives for crystal engineering in TMDC materials for structure stability, machine learning concept marge with materials, and their emerging applications.

Effect of chemical substitution and external strain on phase stability and ferroelectricity in two dimensional M2CT2 MXenes

“…In many 2D materials, alloying of both cations and anions has been shown to be a good way to preferentially stabilize metastable phases and tune their properties. 62,[78][79][80] To determine the most energetically favorable Sr/Y position in each alloy we tested all possible relative orientations and took the lowest energy one; all structures tested at each concentration in the mixed and asymmetric phases are shown in ESI Fig. S28 and S29, † respectively, with the lowest energy one highlighted.…”

Structure modulation of two-dimensional transition metal chalcogenides: recent advances in methodology, mechanism and applications

“…43 A relatively high doping amount can enable the formation of TMD alloys, which manifest structures between two different TMDs. 45 Besides chalcogen dopants with discrepancy in their atom radius and charge density, doped transition metal atoms are likely to induce the phase transition in the original TMDs, which is derived from the distinguished coordination of transition metals with extra valence electrons. For example, MoS 2 flakes with doped Re or Fe atoms are transformed from the original 1H phase to the 1T phase 46,47 because the extra valence electrons of Re and Fe dopants induce altered orbital splitting on account of the crystal field theory.…”

A Rising 2D Star: Novel MBenes with Excellent Performance in Energy Conversion and Storage

“…The recently discovered in-plane chemically ordered MAX phase alloy called i-MAX phase is an example [71][72][73]. A remarkable feature of i-MAX phase is that the two-dimensional MXene obtained by different etching methods can be chemically ordered in plane or vacancy ordered, which has great application prospects for catalysis and energy storage [74][75][76][77][78][79][80][81]. Encouraged by the i-MAX phase discovered earlier, Martin et al [82] theoretically identified 15 novel MAB phases with in-plane chemical order, called i-MAB phases (Fig.…”