Lim Sung K, Chung Keum Jee, Kim Young-Ho, Kim C K, Yoon C S
Department of Materials Science and Engineering, Hanyang University, Seoul 133-791, South Korea.
J Colloid Interface Sci. 2004 May 15;273(2):517-22. doi: 10.1016/j.jcis.2004.01.084.
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.
通过在两个聚酰亚胺（PI）前驱体层之间氧化铁金属膜，制备了嵌入聚酰亚胺（PI）基质中的单层γ-Fe₂O₃纳米颗粒。存在一个临界铁厚度（约7纳米），超过该厚度时，在PI膜中会形成连续的γ-Fe₂O₃膜层。低于临界铁厚度时，氧化膜会分解成尺寸约为8纳米且尺寸分布窄的细颗粒。进一步表明，这些纳米颗粒可能具有金属核，被氧化层包围。该方法提供了一种用精细磁性氧化物纳米颗粒覆盖大面积的独特方式，可用于高密度数据存储介质的潜在应用。
