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- W2527849305 abstract "The ability to modify materials at the atomic scale is crucial for the fabrication of functional nanoscale building blocks for novel nanodevices. Consistency and reproducibility of modifications represent the greatest technical challenges, which demand finer structuring capability than the currently available methods. In this chapter, we will present our recent results of sub-nanometer characterization and modification of two-dimensional (2D) materials enabled by an ultrafine helium ion beam. Characterization will be presented not only in terms of lateral dimension measurement, but also with quantitative thickness and work function extraction. This information is obtained from secondary electron imaging. The effect of contamination and charging on our ability to extract such quantitative information will also be assessed. We will demonstrate that structural defects and stoichiometry modification can be controllably introduced in a few-layer molybdenum disulfide (MoS2) sample at a few-nanometer scale. Consequently, localized tuning of the physical properties of MoS2 can be realized. Fabrication of MoS2 nanostructures with 7-nm dimensions and pristine crystal structure has also been achieved, and the effects of beam dose and profile on the modification will be clarified. This nanoscale modification technique is a generalized approach which can be applied to various 2D materials to produce a new range of 2D metamaterials." @default.
- W2527849305 created "2016-10-14" @default.
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- W2527849305 date "2016-01-01" @default.
- W2527849305 modified "2023-09-27" @default.
- W2527849305 title "Helium Ion Microscopy for Two-Dimensional Materials" @default.
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- W2527849305 doi "https://doi.org/10.1007/978-3-319-41990-9_11" @default.
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