Investigation on Bi2Te3 Nanoplatelets Solvothermal Synthesis with Interest in Centered Single Nanopore

Two-dimensional hexagonal Bismuth Telluride (Bi2Te3) nanoplates can exhibit a chiral edge current due to the presence of a metallic edge state within the bulk band structure, reflecting their topological nature. The precise control over the morphology and composition of crystalline Bi2Te3 nanoplates using solution-based synthesis is well-established. Introducing a pore at the center of these nanoplates results in a Corbino geometry, providing a platform to observe edge currents at both the inner and outer edges and explore correlations between them. In this study, we present a solvothermal synthesis method to create and control pore sizes at the center of a few quintuple-layered Bi2Te3 nanoplates. We characterize the nanopore distribution, size, and morphology using transmission electron microscopy and atomic force microscopy. We show that the removal of tellurium (Te) nanorods, which act as nucleation sites for nanoplate growth, leaves behind nanopores. Furthermore, as the thickness of the Te rods increases, the nanopore size also increases. Finally, we employ magnetic force microscopy to map the magnetic forces at the inner and outer edges, providing insights into the topological properties in a Corbino geometry.