Stephen Gee Rose Hills
Tuning the Catalyst Size of Helical van der Waals Crystals
This project is exploring the tunability of helical van der Waals nanowires. These nanoscale wires are made of layers of Germanium Sulfide stacked on top of each other, similar to graphite being made of stacked layers of graphene. However, in these nanowires, there is a literal twist running down the middle, resulting in a double helix structure that produces unique properties. This Eshelby twist links the twist rate of the nanowire with a dislocation in the middle of the nanowire, and the cross-sectional area. Through modulation of the catalyst size, the cross-sectional area, twist rate, and electronic properties of the nanowires can be tuned. Poly-l-lysine, a polymer, will be used to control the coalescence of the catalyst particles, allowing for the synthesis of thinner nanowires and altered properties.