Scanning Tunneling Microscopy Studies of Porous and Oxidized Zn
This paper reports the scanning tunneling microscopy (STM) and scanning tunneling spectroscopy (STS) studies of porous Zn (p- Zn) prepared by electrochemical etching. Further, the post annealing of the p- Zn is carried out and STM/STS investigations are also performed. STM studies of these samples reveal the porous structure and display small, pseudo-spherical shaped crystals in the range of 2 and 100 nm, 2 and 50 nm, and similar average corrugation of 9 nm for p- Zn and oxidized p-Zn. STS analysis of freshly prepared p- Zn shows a band gap of 2.4 eV along with metallic conductance behavior. However, oxidized p- Zn reveals a distinct wide band gap (3 eV) and shows shallow donor states near the conduction band.
Soon-Bok Lee and Yun-Jae Kim
S. S. Chang, A. Sakai, "Scanning Tunneling Microscopy Studies of Porous and Oxidized Zn", Key Engineering Materials, Vols. 326-328, pp. 373-376, 2006