中国物理B ›› 2001, Vol. 10 ›› Issue (4): 295-299.doi: 10.1088/1009-1963/10/4/306
• ATOMIC AND MOLECULAR PHYSICS • 上一篇 下一篇
张通和1, 吴瑜光1, 桑海波1, 李永良2, 周固2
Zhang Tong-he (张通和)a, Wu Yu-guang (吴瑜光)a, Sang Hai-bo (桑海波)a, Li Yong-liang (李永良)b, Zhou Gu (周固)b
摘要: The fractal and multi-fractal patterns of metal atoms are observed in the surface layer and cross section of a metal ion implanted polymer using TEM and SEM for the first time. The surface structure in the metal ion implanted polyethylene terephthalane (PET) is the random fractal. Certain average quantities of the random geometric patterns contain self-similarity. Some growth origins appeared in the fractal pattern which has a dimension of 1.67. The network structure of the fractal patterns is formed in cross section, having a fractal dimension of 1.87. So it can be seen that the fractal pattern is three-dimensional space fractal. We also find the collision cascade fractal in the cross section of implanted nylon, which is similar to the collision cascade pattern in transverse view calculated by the TRIM computer program. Finally, the mechanism for the formation and growth of the fractal patterns during ion implantation is discussed.
中图分类号: (Fractals; macroscopic aggregates (including diffusion-limited Aggregates))