Thermally Activated Interaction of Co Growth with ZnO(101̅0) Surface

Abstract

The nucleation and sintering characteristics of Co on ZnO(101̅0) during annealing were investigated by scanning tunneling microscopy (STM). The extent of coverage and annealing temperature were varied to modify the size of the Co nanoclusters. Temperature-dependent X-ray photoemission spectra of the Co chemical state reveal that metallic Co dominates the annealing procedure on ZnO(101̅0) and is more thermally stable than Co on both ZnO(0001) and ZnO(0001̅). The effects of annealing time and the distribution of Co adatoms were elucidated by STM. The results have potential implications for the thermal stability of Co/ZnO(101̅0) in real catalytic processes.

Selective Hydrogen Etching Leads to 2D Bi(111) Bilayers on Bi2Se3: Large Rashba Splitting in Topological Insulator Heterostructure

“…The STM experiments were performed in an ultra-high-vacuum (UHV) system (JSPM-4500 A/S; JEOL Ltd.) with base pressure 1.5 × 10 –10 Torr. The system consisted of a sample-preparation chamber and a variable-temperature STM/AFM observation chamber equipped with a cooling tank. − The samples were introduced into a preparation chamber with base pressure 3.7 × 10 –10 Torr in which decapping was performed. In the direct desorption, the samples were heated from 23 to ∼180 °C, at which point the Se capping layers were removed.…”

Tailoring low-dimensional structures of bismuth on monolayer epitaxial graphene

“…Experiments were carried out in an ultrahigh-vacuum (UHV) system (JSPM-4500 A/S; JEOL Ltd.) with a base pressure of 2.0 × 10 −8 Pa. The system consisted of a sample preparation chamber and a variable temperature STM/AFM observation chamber equipped with a cooling tank 32 33 . STM experiments were conducted at room temperature and data were collected in a constant current mode.…”