Formation of 1D-nanowires and 2D nanophases in heteroepitaxy of Sb on high index Si(5 5 12) surface.
The surface topography of high index Si(5 5 12) presents a single-domain planar reconstruction that is composed of (225) and (337) regions with nanoscale widths and row like trenches and provides an unique template for the growth of nanostructures. In this study, Sb has been adsorbed on this Silicon surface to form various superstructural phases by steering the kinetic parameters and post growth annealing of the surface. Different pathways adopted have shown the formation of stabilized ordered superstructural phases corresponding to various coverages and substrate temperatures and are probed in-situ by complementary surface sensitive techniques such as Low Energy Electron Diffraction (LEED), Auger Electron Spectroscopy (AES), and Electron Energy Loss Spectroscopy (EELS). The growth of Sb at 300 degrees C substrate temperature and annealing the formed system to different temperatures upto 820 degrees C leads to the formation of low dimensional phases having anisotropicity along the (110) direction like atomic wires. The results also demonstrate the pathways in tailoring 1 D and 2D nanostructure formation, on this technologically and scientifically important interface.
Kumar
Mahesh
M
Surface Physics and Nanostructures, National Physical Laboratory, New Delhi 110012, India.
Govind
Paliwal
V K
VK
Vedeshwar
A G
AG
Shivaprasad
S M
SM
D000965:Antimony / Q000737:chemistry*; D003460:Crystallization / Q000379:methods*; D046911:Macromolecular Substances / Q000737:chemistry; D008422:Materials Testing; D008968:Molecular Conformation; D036103:Nanotechnology / Q000379:methods*; D043942:Nanotubes / Q000737:chemistry* / Q000648:ultrastructure*; D010316:Particle Size; D044367:Phase Transition; D012825:Silicon / Q000737:chemistry*; D013499:Surface Properties
D046911:Macromolecular Substances; D000965:Antimony; D012825:Silicon