Unique dendritic patterns in organic thin films: Experiments and   modeling

doi:10.1142/S0218348X98000390

CORC > 北京大学 > 信息科学技术学院

	Unique dendritic patterns in organic thin films: Experiments and modeling
	Gao, HJ ; Canright, GS ; Pang, SJ ; Sandler, IM ; Xue, ZQ ; Zhang, ZY
刊名	fractals complex geometry patterns and scaling in nature and society
	1998
关键词	IONIZED-CLUSTER-BEAM FRACTAL PATTERNS GROWTH POLYMER AGGREGATION SURFACES
DOI	10.1142/S0218348X98000390
英文摘要	We present the formation of unique and striking dendritic "seahorse" patterns in the growth of fullerene-tetracyanoquinodimethane (C-60-TCNQ) or pure TCNQ thin films. The films were fabricated by an ionized-cluster-beam deposition method. Energetic neutral and charged clusters were deposited on amorphous carbon substrates. Transmission electron microscopy reveals that the elemental pattern is a "seahorse" - that is, an S-shaped form, with "fins" on the outer edges of the curved arms forming the S. Such forms possess an approximate symmetry under rotations by pi, but strongly break two-dimensional inversion symmetry. A novel formation mechanism is proposed, involving the aggregation of neutral and charged clusters, such that some electrostatic charge is trapped on each growing island. This charge gives rise to a long-range field which biases the growth in a nontrivial way. The broken symmetry arises from the strong amplification of noise in the diffusive aggregation process by the effects of the electrostatic field - that is, the symmetry breaking is spontaneous. This picture is tested by applying a transverse electric field during growth: for sufficiently strong fields, the S-shaped "seahorses" lose their curvature, while retaining the feature of having two main arms. These results demonstrate the importance of electrostatic effects in the growth process, and are consistent with the growth mechanism described here.; Mathematics, Interdisciplinary Applications; Multidisciplinary Sciences; SCI(E); 0; ARTICLE; 4; 337-350; 6
语种	英语
内容类型	期刊论文
源URL	[http://ir.pku.edu.cn/handle/20.500.11897/389831]
专题	信息科学技术学院
推荐引用方式 GB/T 7714	Gao, HJ,Canright, GS,Pang, SJ,et al. Unique dendritic patterns in organic thin films: Experiments and modeling[J]. fractals complex geometry patterns and scaling in nature and society,1998.
APA	Gao, HJ,Canright, GS,Pang, SJ,Sandler, IM,Xue, ZQ,&Zhang, ZY.(1998).Unique dendritic patterns in organic thin films: Experiments and modeling.fractals complex geometry patterns and scaling in nature and society.
MLA	Gao, HJ,et al."Unique dendritic patterns in organic thin films: Experiments and modeling".fractals complex geometry patterns and scaling in nature and society (1998).