Structure and Opto-electric Properties of Polymeric Thin Films Prepared by Molecular Layr Epitaxy

物理气相沉积（PVD）和气相沉积聚合（VDP）是制备具有理想结构的有机和聚合物薄膜的有效和有前途的方法。然而，关于这些薄膜的形成机制的研究报道很少。通过监测沉积过程中吸附量的变化，研究了交替气相沉积聚合过程中的成膜机理。二氯二叠氮二烷基（ADC）单体可以被化学吸附到二氨基庚烷（DAH）层上，形成具有正常分子取向的单分子层。DAH单体可以被化学吸附到ADC层上，并在化学吸附的DAH层表面形成具有正常分子取向的多分子层。采用类似原子层外延的交替气相沉积聚合方法，获得了类似Langmuir-Blodgett膜的层状聚酰胺薄膜。本研究还旨在研究PVD和VDP的吸附/解吸过程。用石英晶体微天平（QCM）观察发现，薄膜形成的第一阶段包括两种类型的吸附，即物理吸附和化学吸附。对有机分子的物理吸附行为进行分析，得到了分子在基体上的平均停留时间和吸附能。

Physical vapor deposition (PVD) and vapor deposition polymerization (VDP) are useful and promising methods for the preparation of organic and polymeric thin films with desired structures. Only a few studies, however, have been reported on the formation mechanisms of these thin films.Film formation mechanism during the alternating vapor deposition polymerization was studied by monitoring the change in the amount of adsorbate during the deposition. Azelaoyl dichloride (ADC) monomers can be chemisorbed onto the diaminoheptane (DAH) layr and form a mono-molecular layr with a normal molecular orientation. DAH monomers can be chemisorbed onto the ADC layr and form a multi-molecular layr on the surface of the chemisorbed DAH layr with the normal molecular orientation. Polyamide thin film with a layred structure like an Langmuir-Blodgett film was obtained by use of the alternating vapor deposition polymerization method, similar to the atomic layr epitaxy method.This research also aims to investigate the adsorption/desorption process in PVD and VDP.Observation using a quartz crystal microbalance (QCM) reveals that the first stage in thin film formation involves two types of adsorption which should be termed as physisorption and chemisorption. Analysis of the physisorption behavior of organic molecules gives the mean stay time and the adsorption energy of the molecules on the substrate.