Synthesis of Meta Symmetric 1T’‐WTe₂ Using an Edge‐Induced Mechanism

Abstract

Summary of main observation and conclusion Lattice symmetry is vital to the properties of two‐dimensional (2D) materials, yet their fixed symmetry cannot meet the increasing requirements in highly efficient and programmable electrical transport. If the structural diversity of 2D materials, as demonstrated by 1T’‐WTe2, is improved without any phase transition or structural reconstruction, excellent metallic 1T’‐WTe2 would be possibly used for integrated devices. Here, we realized meta symmetry of 1T’‐WTe2 by using an edge‐induced mechanism, which is recognized as the combination of the intrinsic C2v symmetry and sixfold axes. On account of the dynamically controlled growth, the meta symmetric 1T’‐WTe2 with ~94.9% purity is obtained for the first time. Meta symmetry will also keep the intrinsic electrical properties of 1T’‐WTe2 over the node. Such meta symmetry could not only enrich the structural diversity of 1T’‐WTe2, but also be extended to other low‐symmetry 2D materials, which would be promising for customized circuits and devices.

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

“…Xiao et al studied the origin of branching 1T′-WTe 2 crystals. 75 As a low-symmetric lattice with the C 2v group, the growth of 1T′-WTe 2 still obeys the kinetic Wulff construction (KWC) theory under a supersaturated reactant supply on mica substrate, which has few trapping sites and provides fast mass transfer of W/Te species. As shown in Fig.…”

“…Compared with the edges of 1H-TMDs, that of other TMDs (1T, 1T 0 and 1T 00 phases) are much more complicated, and thus it is difficult to reveal the relationship between their edges and shapes. Fortunately, 1T 0 -MoTe 2 and 1T 0 -WTe 2 have been studied based on the simulation of the corresponding edge evolution and experimental results, [74][75][76] which revealed the origin of their rectangular or ribbon shapes. Specifically, edge evolution can help to understand the underneath growth mechanism of TMD crystals.…”

Highly selective photothermal conversion of CO2 to ethylene using hierarchical boxwood ball-like Weyl semimetal WTe2 catalysts

“…2a, which show four prominent peaks at 120, 140, 162 and 210 cm −1 . [48][49][50] No peaks associated with WO 3 can be found, indicating a complete transformation of WO 3 into WTe 2 . X-Ray diffraction patterns show that the diffraction peak intensity at 52.5°, corresponding to the (2 0 0) plane, for WTe 2 HNSs is lower than that for WTe 2 NRs and NPs due to different structures (Fig.…”

Self-Powered Broadband Photodetectors Based on Large-Scale Continuous Films of Weyl Semimetal WTe2

“…In contrast to the exfoliation and transfer assembly procedure, the chemical vapor deposition (CVD) growth would readily provide few-layer TMDCs on the SiO 2 /Si substrate. In the past few years, researchers have extensively investigated diverse CVD methods for synthesizing thin films of WTe 2 . − Nevertheless, several challenges remain to be addressed, including film scale and uniformity, domain size, and thickness control, etc., mainly due to the high melting point of tungsten and poor reactivity with tellurium. − There is an urgent demand for a facile synthesis method that offers high-quality, large-area WTe 2 samples, which would thus be applied in optoelectronic devices compatible with semiconductor technology.…”