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Carbon films containing transition metal particles of nano and submicron sizes

机译：包含纳米和亚微米尺寸的过渡金属颗粒的碳膜

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摘要

Aromatic polyimide films containing cobalt compounds were prepared by mixing Co(NO_3)_2 and CoCl_2 with a polyamic acid in solution and following imidization on glass plates. The effect of heat treatment on structure, texture and magnetic property of the films was investigated, and the formation process of ferromagnetic particles of nano and submicron sizes in the films was examined. As the particle sizes increased with increasing heat treatment temperature (HTT), the magnetic property changed from superparamagnetic to ferromagnetic, and the ferromagnetic particles of single magnetic domain transferred to those with multi-magnetic domain by further heat treatment. The distribution of metal particle size became very wide by the heat treatment. Pores were found on the surfaces of the heat-treated films, and pore sizes were very similar to those for the metal particles, suggesting that pores were paths of the particle movements. These results were compared with those obtained previously for the polyimide films containing nickel and iron compounds. Different metal compounds introduced in polyimide films gave different processes of the formation and growth of metal particles and pores as HTT increased.
机译：通过将Co（NO_3）_2和CoCl_2与聚酰胺酸在溶液中混合，然后在玻璃板上酰亚胺化，可以制备出含钴化合物的芳香族聚酰亚胺薄膜。研究了热处理对薄膜结构，织构和磁性能的影响，并研究了薄膜中纳米和亚微米尺寸的铁磁颗粒的形成过程。随着粒度随着热处理温度（HTT）的增加而增加，磁性能从超顺磁变为铁磁，单磁畴的铁磁颗粒通过进一步热处理而转移到具有多磁畴的铁磁颗粒。通过热处理，金属粒径的分布变得非常宽。在热处理膜的表面上发现了孔，并且孔的尺寸与金属颗粒的孔非常相似，表明孔是颗粒运动的路径。将这些结果与先前获得的包含镍和铁化合物的聚酰亚胺膜的结果进行比较。随着HTT的增加，引入到聚酰亚胺膜中的不同金属化合物给出了不同的金属颗粒和孔的形成和生长过程。

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