Polymer thin films, organic

A menu of new fabrication tools and strategies is contributing to growth and interest in alternative methods to fabricate organized polymer thin films and coatings other than with the traditional L B approach. Both direct chemical immobilization of polymers and sequentially directed adsorption methods have been shown to produce stable new and potentially useful ultrathin films and layered structures on solid supports. Applications for such... 

Usually, a particle of less than 10 nm is called a cluster. They possess many special properties and application fields, such as electro-optical devices. So far, suspensions of clusters in an inert gas atmosphere have mostly been studied, and there have been fewer studies of suspensions in semiconductors and in organic polymer thin films. Because of the special optical and electronic propoties and potential applications of metal-cluster organic complex thin films, we have studied the structures and properties of these organic polymer thin films. In this section, we will present the structural properties of Au-PE and Ag-PE thin films [28,29]. 

Xue, Z. Q., Gao, H. J., and Pang, S. J., Study of ultrafine particle-organic polymer thin films. Thin Solid Films, 228, 304-306 (1993). 

Walba, D. M., Keller, P., Parmar, D. S., Clark, N. A., and Wand, M. D., Design and synthesis of new ferroelectric liquid crystals. 9. An approach to creation of organic polymer thin films with controlled, stable polar orientation of functional groups, J. Am. Chem. Soc., Ill, 8273-8274 (1989). 

Hamilton MC, Martin S, Kanicki J (2004) Field-effect mobility of organic polymer thin-film transistors. Chem Mater 16 4699-4704... 

Kinder L, Kanicki J, Petroff P (2004) Structural ordering and enhanced carrier mobility in organic polymer thin film transistors. Synth Met 146 181-185... 

Polythiophene can be synthesized by electrochemical polymerization or chemical oxidation of the monomer. A large number of substituted polythiophenes have been prepared, with the properties of the polymer depending on the nature of the substituent group. Oligomers of polythiophene such as (a-sexithienyl thiophene) can be prepared by oxidative linking of smaller thiophene units (33). These oligomers can be sublimed in vacuum to create polymer thin films for use in organic-based transistors. 

Three kinds of PAV films was prepared using methoxy pendant precursors. The chemical structures and synthetic route of the PAV films used in this study are shown in Fig. 19. The details of synthesis of the methoxy pendant precursors have been described in refs. 29 and 30. The precursors were soluble in conventional organic solvents, for example, chloroform, dichloromethane, benzene and so on. The precursor polymer thin films were spin-coated on fused quartz substrates from the chloroform solutions. The precursor films were converted to PAV films by the heat-treatment at 250 0 under a nitrogen flow with a slight amount of HC1 as a catalyst. This method provided high performance PAV films with excellent optical quality. 

Organic polymeric flocculating agents, mechanisms of, 77 632-633 Organic polymeric thin films, quasi phase matching in, 7 7 451 Organic polymers... 

Additional polymer thin films, (I), and polymer thin-film devices were prepared by the authors (1) and used as organic solar batteries. 

Kawase et al. [17] fabricated All-polymer thin film transistors by inkjet printing technique. They used these transistors as active-matrix backplane for information displays. This field has been dominated by amorphous Si TFTs and large liquid crystal displays with an amorphous Si TFT active matrix backplane have been manufactured at a reasonable cost. An organic TFT is expected to reduce the cost even more, and to be applied to flexible displays based on a plastic substrate. The TFT characteristics required for active-matrix displays are (1) sufficient drain cmrent, (2) low off current, (3) low gate leakage current through an insulator, (4) small gate overlap capacitance and (5) uniform characteristics. 

An attractive alternative to organic fluorophores in formulated polymeric sensor films for chemical detection is to use inorganic luminescent materials. Semiconductor nanocrystals have a dramatically improved photostability and are attractive as luminescent labels.1415 However, some nanocrystals also exhibit photoluminescence (PL) that is sensitive to the local environment. For example, it was observed that PL of CdSe nanocrystals incorporated into polymer thin films responded reversibly to different gases.16 Because in sensing applications nanomaterials bring previously unavailable capabilities1719 and unexpected results,20 23 we explored the environmental sensitivity of semiconductor nanocrystals upon their incorporation in different rationally selected polymeric matrices.24 26... 

PFS block co-polymers in which the blocks are immiscible (which is generally the case) would be expected to self-assemble to form phase-separated organometallic domains in the solid state. Based on the classical behavior of organic block co-polymers, thin films of polyferrocene diblock co-polymers would be expected to form domains such as spheres, cylinders (or their anti-structures), double diamonds (or gyroids), or lamellae (Section 1.2.5). The preferred domain structure would be expected to be controlled by the ratio of the blocks, their degree of immiscibility (as defined by the Flory-Huggins interaction parameter y), and the overall molecular weight of the block co-polymer. 

---