Shape and Orientation Controlled Hydrothermal Synthesis of Silicide and Metal Dichalcogenide on a Silicon Substrate

Abstract

Shape-controlled MoS 2 has been grown directly on a silicon substrate, for the first time, with the use of a facile hydrothermal synthesis approach. The growth morphology is dependent on the substrate orientation. Square, hexagonal, and triangular patterns of MoS 2 are grown on Si(100), Si(110), and Si(111), respectively. Detailed studies reveal that Mo silicide is formed at the initial stage, and the formation of silicide patterns is dictated by the different surface energies of Si(100), Si(110) and Si(111). Subsequently, shaped MoS 2 patterns are formed following the silicide ones at the thermodynamic equilibrium. The approach for the formation of these patterns can be generalized to other 2D materials and can also be formed on a large scale by a lithography method. The work has shown a new technique to form silicide via solution processing and grow patterned 2D materials directly on silicon substrates, which may have the potential for advancing next-generation electronic devices.

2D layered double hydroxides and transition metal dichalcogenides for applications in the electrochemical production of renewable hydrogen

“…39 Consequently, these methods have garnered significant interest for synthesising TMDs, LDHs, and their respective composites. 40,41 As shown in Fig. 1, flower-like structures are often formed using the hydrothermal method.…”

Scalably Nanomanufactured Atomically Thin Materials‐Based Wearable Health Sensors

“…[ 243 ] The hydrothermal/solvothermal process typically requires a long reaction time (e.g., 48 h) for synthesizing 2D materials. [ 143,244,245 ] To address this issue, Yan et al [ 233 ] reported a facile and efficient microwave‐assisted solvothermal method for the synthesis of WS 2 nanosheets in NMP, using cheap tungsten hexachloride (WCl 6 ) and elemental S as the starting materials. Compared to the long synthesis time of the traditional hydrothermal method, the microwave‐assisted solvothermal reaction is considerably faster (within 8 hours) with a high yield (>90%) and satisfactory reproducibility.…”

Nanobionics-Driven Synthesis of Molybdenum Oxide Nanosheets with Tunable Plasmonic Resonances in Visible Light Regions

“…Recently, ultra-doping of semiconducting materials such as MoO 3 has shown great promise in producing near IR and visible light plasmon resonance. , The plasmonic behaviors in these quasi-metallic materials can be tunable, driven by the concurrently injected charge carriers during the doping processes. − Consequently, facile and controlled synthesis of plasmonic metal oxides is one of the most critical criteria to realize many applications based on these versatile materials. ,, The conventional synthesis of this type of plasmonic materials is mainly via the reduction intercalation of MoO 3 with Zn/HCl solutions or using noble metal-coated MoO 3 in the presence of H 2 gas through a spill-over process. − The synthesis relies on harsh solvents, elevated temperature or pressure, and noble metals, which are not environmentally friendly and less cost-effective . Other techniques include solar light irradiation to achieve the separation of photo-generated electrons and hole pairs, consequently producing charges to dope the 2D MoO 3 . , However, MoO 3 has a band gap of ∼3.2 eV and can only be excited under the optical wavelengths of ∼387 nm.…”

“…23−25 The synthesis relies on harsh solvents, elevated temperature or pressure, and noble metals, which are not environmentally friendly and less cost-effective. 26 Other techniques include solar light irradiation to achieve the separation of photogenerated electrons and hole pairs, consequently producing charges to dope the 2D MoO 3 . 27,28 However, MoO 3 has a band gap of ∼3.2 eV and can only be excited under the optical wavelengths of ∼387 nm.…”