Formation of nano-pyramids of layered materials with AFM
We have been able to raise squares of around 2 A in height of the layered materials Bi1.6Sb0.4Se3, Bi1.9Sb0.1Se3 and Bi2Se3 by means of contact atomic force microscopy in air. By raising squares on/beneath previously produced squares, Mayan-like pyramids have been constructed, each step of the pyramid being around 2 A in height. We neither remove matter from the surface nor produce a localized oxidation of the sample; we elevate a portion of it. When the surface is oxidized, the AFM cantilever pulls the oxide off producing holes. The raising of the squares is also possible in a nitrogen atmosphere.
Contera
SA
The Institute of Scientific and Industrial Research (Osaka University, ISIR), Ibaraki, Japan. sonia31@sanken.osaka-u.ac.jp
Yoshinobu
T
Iwasaki
H
Bastl
Z
Lostak
P