"Preparation and characterization of optical and electronic properties of monolayer nanoribbons"
Monolayer nanoribbons, a unique material platform that sits between one-dimensional(1D) and two-dimensional (2D) geometries, are particularly exciting for their quantum confinement and the application in next-generation electronics and devices. For example, transition metal dichalcogenide nanoribbons provide an avenue to enable access to light, electron spin, and tunable strain to reach new heights in photonics, quantum computing, and flexible electronics. However, a key challenge for their application is the limited preparation techniques. In this fundamental exploration, we unveil a new universal top-down preparation technique for exfoliating nanoribbons directly from a broad range of van der Waals crystals. Through fundamental optical characterization such as photoluminescence, second harmonic generation, and Raman spectroscopy, we illustrate how the optical properties of nanoribbons can be modified by their edge configuration and width. In addition, we demonstrate the unique electrical properties of the nanoribbons in comparison to their 2D monolayer counterparts with scanning probe microscopy and field-effect transistors. Our results provide crucial information on the optical electronic properties and how they can be influenced by the unique local doping, optical anisotropy, and strain in nanoribbons, which are particularly important for their future applications in electronics, sensors, and catalysis.
Meeting ID: 968 3333 0107; Password: 225731