Nucleation and oriented growth of aromatic crystals on friction-transferred poly(tetrafluoroethylene) layers

被引:24
作者
Damman, P
Dosiere, M
Brunel, M
Wittmann, JC
机构
[1] CNRS,CRISTALLOG LAB,F-38000 GRENOBLE,FRANCE
[2] INST CHARLES SADRON,F-67083 STRASBOURG,FRANCE
关键词
EPITAXIAL CRYSTALLIZATION; FILMS; ORIENTATION;
D O I
10.1021/ja961173k
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
The oriented growth of p-nitroaniline and hydroquinone deposited from the vapor phase on monooriented thin films of poly(tetrafluoroethylene) (PTFE) prepared by friction transfer is investigated by grazing incidence X-ray diffraction and polarized FTIR spectroscopy. Due to the formation of two-dimensional hydrogen-bonded networks, both aromatic compounds crystallize with a layered structure. p-Nitroaniline is found to contact the (100)(PTFE) surface with its (101)(PNA) crystallographic plane which is parallel to the hydrogen-bonded sheet. A similar PTFE/hydrogen-bonded sheet interface was never observed for gamma-hydroquinone crystals vacuum deposited under similar experimental conditions. In fact, hydroquinone orients on PTFE with a (110)(HYD) or (1 (1) over bar 0)(HYD) contact plane. Reconstruction of the PTFE substrate at the substrate/deposit interface is invoked as a tentative explanation of the difference in orientational behavior of these two organic compounds.
引用
收藏
页码:4633 / 4639
页数:7
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