Surface Modification of Monolayer MoS2 by Baking for Biomedical Applications
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fchem-08-00741.pdf
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1.09 MB
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Checksum (MD5)
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Author(s)
Wang, Yan
Ma, Yuanjun
Shi, Jinping
Yan, Xiangyu
Luo, Jun
Zhu, Huilong
Jia, Kunpeng
Li, Juan
Zhang, Can Yang
Date Issued
October 2020
Journal
Frontiers in Chemistry
Publisher
Frontiers Media SA
Citation
Wang, Yan et al. "Surface Modification of Monolayer MoS2 by Baking for Biomedical Applications." Frontiers in Chemistry 8 (October 2020): 741. © 2020 Wang et al.
Version
Final published version
Abstract
Molybdenum disulfide (MoS₂), 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 MoS₂ 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 MoS₂ with enhanced energy exchange efficiency (EEE) for the development of MoS₂-based nanodevices and therapeutic strategies. In this work, a monolayer MoS₂ film was first synthesized through a chemical vapor deposition method, and the surface of MoS₂ was further modified via a baking process to develop p-type doping of monolayer MoS₂ with high EEE, followed by confirmation by X-ray photoelectron spectroscopy and Raman spectroscopy analysis. The morphology, surface roughness, and layer thickness of monolayer MoS₂ before and after baking were thoroughly investigated using atomic force microscopy. The results showed that the surface roughness and layer thickness of monolayer MoS₂ modified by baking were obviously increased in comparison with MoS₂ without baking, indicating that the surface topography of the monolayer MoS2 film was obviously influenced. Moreover, a photoluminescence spectrum study revealed that p-type doping of monolayer MoS₂ displayed much greater photoluminescence ability, which was taken as evidence of higher photothermal conversion efficiency. This study not only developed a novel MoS₂ with high EEE for future biomedical applications but also demonstrated that a baking process is a promising way to modify the surface of monolayer MoS₂.
MIT Department
Singapore-MIT Alliance in Research and Technology (SMART)
Terms of Use
Creative Commons Attribution 4.0 International license
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DOI of Published Version
https://doi.org/10.3389/fchem.2020.00741
