Atomic force microscopy investigation of growth process of organic TCNQ aggregates on SiO2 and mica substrates

doi:10.1088/1674-1056/19/8/080517

中国物理B ›› 2010, Vol. 19 ›› Issue (8): 80517-080517.doi: 10.1088/1674-1056/19/8/080517

Atomic force microscopy investigation of growth process of organic TCNQ aggregates on SiO₂ and mica substrates

郇庆, 胡昊, 潘理达, 肖江, 杜世萱, 高鸿钧

Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China

收稿日期:2010-01-26 修回日期:2010-02-04 出版日期:2010-08-15 发布日期:2010-08-15
基金资助:
Project supported by the National Natural Science Foundation of China (Grant No. 10774176), and the National Basic Research Program of China (Grant No. 2006CB806202).

Atomic force microscopy investigation of growth process of organic TCNQ aggregates on SiO₂ and mica substrates

Huan Qing(郇庆), Hu Hao(胡昊), Pan Li-Da(潘理达), Xiao Jiang(肖江), Du Shi-Xuan(杜世萱), and Gao Hong-Jun(高鸿钧)^†

Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China

Received:2010-01-26 Revised:2010-02-04 Online:2010-08-15 Published:2010-08-15
Supported by:
Project supported by the National Natural Science Foundation of China (Grant No. 10774176), and the National Basic Research Program of China (Grant No. 2006CB806202).

摘要/Abstract

摘要： Deposition patterns of tetracyanoquinodimethane (TCNQ) molecules on different surfaces are investigated by atomic force microscopy. A homemade physical vapour deposition system allows the better control of molecule deposition. Taking advantage of this system, we investigate TCNQ thin film growth on both SiO₂ and mica surfaces. It is found that dense island patterns form at a high deposition rate, and a unique seahorse-like pattern forms at a low deposition rate. Growth patterns on different substrates suggest that the fractal pattern formation is dominated by molecule–molecule interaction. Finally, a phenomenal "two-branch" model is proposed to simulate the growth process of the seahorse pattern.

Abstract: Deposition patterns of tetracyanoquinodimethane (TCNQ) molecules on different surfaces are investigated by atomic force microscopy. A homemade physical vapour deposition system allows the better control of molecule deposition. Taking advantage of this system, we investigate TCNQ thin film growth on both SiO₂ and mica surfaces. It is found that dense island patterns form at a high deposition rate, and a unique seahorse-like pattern forms at a low deposition rate. Growth patterns on different substrates suggest that the fractal pattern formation is dominated by molecule–molecule interaction. Finally, a phenomenal "two-branch" model is proposed to simulate the growth process of the seahorse pattern.

Key words: tetracyanoquinodimethane, organic molecule deposition, seahorse-like patterns

中图分类号: (Vapor phase epitaxy; growth from vapor phase)

81.15.Kk

68.37.Ps (Atomic force microscopy (AFM)) 68.55.A- (Nucleation and growth)

郇庆, 胡昊, 潘理达, 肖江, 杜世萱, 高鸿钧. Atomic force microscopy investigation of growth process of organic TCNQ aggregates on SiO₂ and mica substrates[J]. 中国物理B, 2010, 19(8): 80517-080517.

Huan Qing(郇庆), Hu Hao(胡昊), Pan Li-Da(潘理达), Xiao Jiang(肖江), Du Shi-Xuan(杜世萱), and Gao Hong-Jun(高鸿钧). Atomic force microscopy investigation of growth process of organic TCNQ aggregates on SiO₂ and mica substrates[J]. Chin. Phys. B, 2010, 19(8): 80517-080517.

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Atomic force microscopy investigation of growth process of organic TCNQ aggregates on SiO₂ and mica substrates

Atomic force microscopy investigation of growth process of organic TCNQ aggregates on SiO₂ and mica substrates

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