Synthesis of iron oxide nanoparticles in a polyimide matrix.
A monolayer of gamma-Fe(2)O(3) nanoparticles embedded in a polyimide (PI) matrix was fabricated by oxidizing an Fe metal film between two PI precursor layers. There was a critical Fe thickness ( approximately 7 nm) above which a continuous layer of gamma-Fe(2)O(3) film was formed in the PI film. Below the critical Fe thickness, the oxide film broke up into fine particles whose size was approximately 8 nm with narrow size distribution. It was further shown that these nanoparticles could have metallic cores, surrounded by an oxide layer. This method offers a unique way of covering a large surface area with fine magnetic oxide nanoparticles for potential application in high-density data-storage media.
Lim
Sung K
SK
Department of Materials Science and Engineering, Hanyang University, Seoul 133-791, South Korea.
Chung
Keum Jee
KJ
Kim
Young-Ho
YH
Kim
C K
CK
Yoon
C S
CS