Vertically Aligned Luminescent MoS2 Nanosheets Growth and Properties

Vertically aligned MoS2 nanosheets (NSs) with exposed edges on various substrates were successfully synthesized using a chemical vapor deposition technique. The as-grown MoS2 NSs were analyzed by using scanning and... [ view full abstract ]

Vertically aligned MoS2 nanosheets (NSs) with exposed edges on various substrates were successfully synthesized using a chemical vapor deposition technique. The as-grown MoS2 NSs were analyzed by using scanning and transmission electron microscopy. The obtained results along with the image analysis revealed the structural crystalline form of MoS2. The X-ray photoelectron spectroscopy and, Raman spectroscopy studies revealed the high crystallinity and quality of the synthesized NSs. The MoS2 NSs show visible light emission similar to mechanically exfoliated monolayer MoS2 NSs as confirmed by photoluminescence (PL) and UV-visible spectroscopy. The striking PL signal from the multilayered vertically aligned MoS2 NSs is explained by density functional theory calculations. The as-grown NSs can be transferred to a desired substrate employing a wet-chemical process. We have observed excellent field emission properties for the wet-transferred MoS2 sample on a conducting substrates. The vertical MoS2 NSs show a hydrophobic character with contact angle of 114°. These as-grown MoS2 NSs endowed with multiple qualities would be highly useful in the development of catalysis, nano-optoelectronic, gas-sensing and bio-sensing device applications.