Growth of A-Few-Atom Wide Nanowires with Different Surface Reconstructions Via Desorption of Au on Vicinal Si (111) Surfaces

摘要

We present scanning tunneling microscopy studies of adsorption and desorption of Au on vicinal Si (111)-7×7 (4° miscut) surfaces. The Au film transforms into percolated structures due to annealing at 400 °C. On annealing at 800 °C, the Au film is found to evaporate completely from the terrace whereas the step edges retain the signature of Au in the form of droplets. This also modifies the atomic structure of the step-bunched facets which show nanowire-like structures with various surface reconstructions like 7×5, 5×3 √2 and 5×2 which are Au-induced reconstructions.