The Study of Atmospheric Pressure CVD Growth Process of MoxW1-xTe2 Nanobelts for Tuneable Chemical Composition

Transition metal dichalcogenides nanomaterials with topological semimetallic phase (MoTe, WTe and MoWTe) are expected to realize no-consumption electronic transportation due to its Dirac point. Especially, the various structure existence in MoWTe, like hexagonal (2H), monoclinic (1T') and othorombic (T), provides opportunities for phase engineering, which is beneficial for future novel electronic and spintronic devices. Plenty works have focused on the synthesis of MoTe, WTe and MoWTe nanomaterials. Unfortunately, the understanding of the growth process of MoWTe nanomaterials is still absent and the exact control of the atomic ratio between Mo and W in MoWTe nanomaterials is still a huge task up to now. Here, we study the growth process of MoWTe nanomaterials by the growing of binary MoTe and WTe nanomaterials. Through detailed structural and compositional characterization, same growth mode, crystallography, and morphology have been observed among MoTe, WTe and MoWTe nanomaterials. Through analysis, we suggest that the heating temperature of Mo and W precursors during the CVD process is the key parameters to achieve the tuneable chemical composition of MoWxTe nanomaterials. This study dissected the growth process of MoWTe nanomaterials and provided a possible method to control the chemical composition of MoWTe nanomaterials by APCVD, which is beneficial to realize the phase engineering in Mo-W-Te system and also for future topological application.