Strain induced dewetting of a molecular system:: Bimodal growth of PTCDA on NaCl
Strain induced dewetting of a molecular system:: Bimodal growth of PTCDA on NaCl
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DOI：
10.1103/physrevlett.100.186104
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发表时间：
2008-05-09
影响因子：
8.6
通讯作者：
Grutter, P.
中科院分区：
文献类型：
--
作者：
Burke, S. A.;Ji, W.;Grutter, P.
采用高分辨率非接触原子力显微镜对沉积在NaCl（001）表面的分子3,4,9,10-苝四羧酸二酐（PTCDA）进行了亚单层覆盖成像。观察到两种岛型：低覆盖率的p3x3外延单层岛和高覆盖率的这些和块状晶体的混合物。纯单层岛和混合岛之间的转变发生在0.85 ML左右，对应于一个完整的p3x3层。计算表明p3x3外延与PTCDA多层晶体不相容。因此，附加层的生长导致界面结构的适应，迫使脱湿过渡。
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.