Strain induced dewetting of a molecular system:: Bimodal growth of PTCDA on NaCl

被引：90

作者：

Burke, S. A. ^{[1
]}

Ji, W. ^{[1
]}

Mativetsky, J. M.

Topple, J. M.

Fostner, S.

Gao, H. -J. ^{[1
]}

Guo, H.

Grutter, P.

机构：

[1] Chinese Acad Sci, Inst Phys, Beijing natl lab Condensed Matter Phys, Beijing 100080, Peoples R China

来源：

PHYSICAL REVIEW LETTERS | 2008年 / 100卷 / 18期

关键词：

D O I：

10.1103/PhysRevLett.100.186104

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Submonolayer coverages of the molecule 3,4,9,10-perylene tetracarboxylic dianhydride (PTCDA) deposited on NaCl(001) surfaces were imaged with high resolution noncontact-atomic force microscopy. Two island types were observed: monolayer islands with a p3x3 epitaxy at low coverage and a mixture of these and bulklike crystallites at higher coverage. The transition between the pure monolayer islands and mixed islands occurs at similar to 0.85 ML, corresponding to a complete p3x3 layer. Calculations show the p3x3 epitaxy to be incompatible with a multilayer crystal of PTCDA. Consequently, the growth of additional layers results in an adaptation of the interface structure forcing a dewetting transition.

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