Sol-gel-derived iron oxide thin films on silicon: surface properties and interfacial chemistry.
ACS Appl Mater Interfaces
; 1(9): 1843-6, 2009 Sep.
Article
in En
| MEDLINE
| ID: mdl-20355802
ABSTRACT
Uniform high-quality iron oxide thin films can be formed from the spin coating of iron oxide/hydroxide sol-gels on a silicon substrate. Thermal processing of the films at temperatures of approximately 300 degrees C results in the transformation of films into a ternary layered structure with iron oxide, Fe(2)O(3), at the surface, characterized by Mossbauer spectroscopy, and reduced, metallic iron characterized by depth profiling of the surface by X-ray photoelectron spectroscopy as a function of Ar(+) etching. Imaging of the etched surface by scanning electron microscopy reveals two distinct regions at the interface, nanoparticles that are very iron-rich separated by an unstructured region that is somewhat less iron-rich. The results demonstrate a synthetic protocol for the spontaneous formaton of a ternary layered structure from a simple one-step preparation.
Full text:
1
Collection:
01-internacional
Database:
MEDLINE
Main subject:
Silicon
/
Ferric Compounds
/
Chemistry
/
Phase Transition
Language:
En
Journal:
ACS Appl Mater Interfaces
Journal subject:
BIOTECNOLOGIA
/
ENGENHARIA BIOMEDICA
Year:
2009
Document type:
Article
Affiliation country: