Two-dimensional (2D) layer-structured chalcogenides host many interesting physical and chemical phenomena such as topological insulator and intercalation. Their nanostructures represent novel candidates to host those phenomena. Here we present our study in the past eight years on chemistry and physics of 2D chalcogenide nanomaterials. First, we have developed several synthesis methods for morphology control of 2D layer materials. Second, we have developed a new method of zero-valent intercalation which allows unprecedented high levels of various metal intercalants inserted into the van der Waals gaps. The resulted optical properties and electrical conductance change drastically. Third, we have fabricated single nanostructure electrical transport devices. Using topological insulator nanostructures, we observed interesting physical phenomena including Aharonov�Bohm oscillations from topological surface electrons, ambipolar transport with effective control of the Fermi level into the bulk bandgap and across the Dirac Point, and localization effects emerging from the surface electrons in confined dimensions. We also demonstrate the catalytic properties of 2D materials.

Physics and chemistry of 2D chalcogenide nanomaterials

247th National Meeting (2014)

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