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）是制备具有所需结构的有机和聚合物薄膜的有用和有前途的方法。然而，只有少数的研究，已经报道了这些薄膜的形成机制。薄膜形成过程中的交替气相沉积聚合反应通过监测沉积过程中的吸附质的量的变化进行了研究。壬二酰氯（ADC）单体可以化学吸附到二氨基庚烷（DAH）层上并形成具有正常分子取向的单分子层。DAH单体可以化学吸附到ADC层上，并在化学吸附的DAH层的表面上形成具有正常分子取向的多分子层。采用交替气相沉积聚合法制备了具有层状结构的聚酰胺薄膜，本研究亦探讨PVD及VDP制程中之吸附/脱附过程，并以石英晶体微天平（QCM）观察。揭示了薄膜形成的第一阶段涉及两种类型的吸附，其应被称为物理吸附和化学吸附。分析了有机分子的物理吸附行为，给出了有机分子在基底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.