Surface Modification of Monolayer MoS2 by Baking for Biomedical Applications

Abstract

Molybdenum disulfide (MoS 2 ), a transition metal dichalcogenide material, possesses great potential in biomedical applications such as chemical/biological sensing, drug/gene delivery, bioimaging, phototherapy, and so on. In particular, monolayer MoS 2 has more extensive applications because of its superior physical and chemical properties; for example, it has an ultra-high surface area, is easily modified, and has high biodegradability. It is important to prepare advanced monolayer MoS 2 with enhanced energy exchange efficiency (EEE) for the development of MoS 2 -based nanodevices and therapeutic strategies. In this work, a monolayer MoS 2 film was first synthesized through a chemical vapor deposition method, and the surface of MoS 2 was further modified via a baking process to develop p-type doping of monolayer MoS 2 with high EEE, followed by confirmation by X-ray photoelectron spectroscopy and Raman spectroscopy analysis. The morphology, surface roughness, and layer thickness of monolayer MoS 2 before and after baking were thoroughly investigated using atomic force microscopy. The results showed that the surface roughness and layer thickness of monolayer MoS 2 modified by baking were obviously increased in comparison with MoS 2 without baking, indicating that the surface topography of the monolayer MoS 2 film was obviously influenced. Moreover, a photoluminescence spectrum study revealed that p-type doping of monolayer MoS 2 displayed much greater photoluminescence ability, which was taken as evidence of higher photothermal conversion efficiency. This study not only developed a novel MoS 2 with high EEE for future biomedical applications but also demonstrated that a baking process is a promising way to modify the surface of monolayer MoS 2 .

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Applications of Polyaniline-Based Molybdenum Disulfide Nanoparticles against Brain-Eating Amoebae

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