Heterolayered 2D nanohybrids of uniformly stacked transition metal dichalcogenide (TMD)–transition metal oxide (TMO) monolayers are synthesized by a self-assembly of exfoliated nanosheets (NSs) with charge-balancing cations. This is the first example of a layer-by-layer-ordered 2D nanohybrid of exfoliated TMD and TMO nanosheets. The homogeneous incorporation of MnO₂ NSs into restacked MoS₂ NSs is quite effective in improving the multifunctionality of MoS₂ as an electrocatalyst for the hydrogen evolution reaction (HER) and electrode for Li-ion batteries, underscoring the universal merit of layer-by-layer ordering of TMD and TMO NSs. In situ spectroscopic analysis of the present TMD–TMO nanohybrid during the electrocatalytic reaction highlights the efficient interfacial charge transfer of the restacked nanosheets with enhanced porosity. The beneficial effect of incorporated TMO NSs on the performance of TMD NSs is attributable to an efficient interfacial charge transfer and increased porosity with depressed self-stacking of NSs and the stabilization of the metallic 1T TMD phase, resulting in the improvement of charge transfer kinetics, the enhancement of reactivity, and the provision of many reaction sites upon hybridization. Density functional theory (DFT) calculations further support the stabilization of the 1T TMD structure over the 2H TMD one via the interaction with neighboring TMO NSs. The present study clearly demonstrates that the restacking of the colloidal mixtures of TMO and TMD NSs can provide an effective way to explore novel multifunctional heterostructures.

In the defective SiC epitaxial layer, the work function variation was observed by Kelvin probe force microscopy (KPFM), and the work function difference came from the variation of polytype and the disordered surface.

Vertically-oriented two-dimensional (2D) tungsten disulfide (WS₂) nanosheets were successfully grown on a Si substrate at a temperature range between and 550 °C via the direct chemical reaction between WCl₆ and S in the gas phase. The growth process was carefully optimized by adjusting temperature, the locations of reactants and substrate, and carrier gas flow. Additionally, vertically-oriented 2D WS₂ nanosheets with a few layers were tested as a surface-enhanced Raman scattering substrate for detecting rhodamine 6G (R6G) molecules where enhancement occurs from chemical enhancement by charge transfer transition from semiconductor). Raman spectra of R6G molecules adsorbed on vertically-oriented 2D WS₂ nanosheets exhibited strong Raman enhancement effects up to 9.2 times greater than that on the exfoliated WS₂ monolayer flake sample. From our results, we suggest that the WS₂ nanosheets can be an effective surface-enhanced Raman scattering substrate for detecting target molecules.