Two-dimensional tungsten ditelluride (WTe 2 ) via low-temperature single step thermo-chemical approach
- PDF / 1,218,740 Bytes
- 6 Pages / 595.276 x 790.866 pts Page_size
- 90 Downloads / 125 Views
RAPID COMMUNICATIONS
Two‑dimensional tungsten ditelluride ( WTe2) via low‑temperature single step thermo‑chemical approach Ishant Chauhan1 · Manjot Kaur1 · Kulwinder Singh1 · Akshay Kumar1 Received: 30 June 2020 / Accepted: 21 August 2020 © Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract Transition ditelluride ( WTe2) is gaining immense attention due to unique physical and electronic properties. But so far, it lacks the low-temperature single-step synthesis. Here, we report the simple thermo-chemical approach for the synthesis of WTe2 nanostructures. It is more economical and a low-temperature synthesis method as compared to various synthesis methods reported in the literature. The results indicate that hydrogen produced during the reaction helps to form an intermediate compound, which then leads to the reduction of WO3 to WTe2. Structural and morphological analysis has been discussed in detail. The possible mechanism behind the synthesis process has been formulated for better understanding. Keywords Tungsten ditelluride · Solvothermal · Nanoflakes · XPS · Raman
1 Introduction Two-dimensional (2D) materials have attained great attention due to their unique and tunable properties. Research in graphene motivated the researchers to explore other 2D materials such as hexagonal boron nitride, metal dichalcogenides, etc. [1, 2]. In transition metal dichalcogenides (TMDs), generally written as MX2, M is transition metal while X are S, Se, and Te. TMDs possess unique properties and have applications in various fields such as gas sensing, photocatalysis, and energy storage devices [3–6]. The versatility of properties of TMDs is assisted by the polymorphism of the monolayers, where metal coordination changes from distorted octahedral to trigonal prismatic [7]. Tungsten ditelluride (WTe2) comes under the same class of materials. WTe2 grab sudden attention after the study of the topological behavior and magnetoresistance property of this material [8]. At ambient conditions, W Te2 usually has an orthorhombic (Td) phase [9, 10]. In WTe2, tungsten atoms in Electronic supplementary material The online version of this article (https://doi.org/10.1007/s00339-020-03936-1) contains supplementary material, which is available to authorized users. * Akshay Kumar [email protected] 1
the Td crystal structure are in octahedral coordination with tellurium. WTe2 has been reported for various applications due to superconductivity and giant magnetoresistance [11, 12]. Despite that, W Te2 is less explored experimentally as compared to MoS2 and WSe2. Synthesis processes reported in the literature are chemical vapor transport (CVT), chemical vapor deposition (CVD), furnace tellurization, solution method, and mechanical exfoliation with tape, etc. [13–15]. Solution method has been used to grow high quality crystals [15]. CVT, CVD, and furnace tellurization required a proper setup for the synthesis process with gas flow, whereas mechanical exfoliation is prone to impurity. Most importantly,
Data Loading...
