Formation Of Organic Thin Films Research Articles

Viscoelastic Analysis in the Formation of Organic Thin Films

ABSTRACT The initial stage of film formation has been analyzed using the quartz crystal microbalance (QCM) method. The resonance frequency and resistance of the QCM covered with paraffin thin film indicate that the viscoelastic properties of films can be changed even before the film formation from the melt or the solution, i.e., pre-transition phenomena can be observed. The QCM analysis also reveals that liquid crystalline molecules can be adsorbed as a solid phase in the vicinity of the interface even in the nematic liquid crystal phase.

Organic Solid Solutions: Formation and Applications in Organic Light‐Emitting Diodes

AbstractTo enhance the performance of organic devices, doping and graded mixed‐layer structures, formed by co‐evaporation methods, have been extensively adopted in the formation of organic thin films. Among the criteria for selecting materials systems, much attention has been paid to the materials' energy‐band structure and carrier‐transport behavior. As a result, some other important characteristics may have been overlooked, such as material compatibility or solubility. In this paper, we propose a new doping method utilizing fused organic solid solutions (FOSSs) which are prepared via high‐pressure and high‐temperature processing. By preparing fused solid solutions of organic compounds, the stable materials systems can be selected for device fabrication. Furthermore, by using these FOSSs, doping concentration and uniformity can be precisely controlled using only one thermal source. As an example of application in organic thin films, high‐performance organic light‐emitting diodes with both single‐color and white‐light emission have been prepared using this new method. Compared to the traditional co‐evaporation method, a FOSS provides us with a more convenient way to optimize the doping system and fabricate relatively complicated organic devices.

有機薄膜の新作製法と光デバイスへの展開

有機薄膜の新作製法と光デバイスへの展開

STM Image Formation of Organic Thin Films: The Role of Water Shell

Analysis of the water role in STM image formation processes for organic thin films was performed in this work. The contribution of the water shell covering the film was considered under the assumpt...

Vacuum deposition films of oxadiazole compounds: formation and structure investigation

The search for alternative routes of organic thin film formation is stimulated by the outstanding properties of these films in such fields as nonlinear optics, photonic data processing and molecular electronics. The formation of highly ordered multilayer structures by thermal vacuum deposition (VD) of organic compounds is an essential step toward the application of supramolecular organic architectures in technical systems. The VD of an amphiphilic substituted 2,5-diphenylene-1,3,4-oxadiazole 1 onto silicon substrates at defined temperature was used for the formation of ultrathin films. The structural data obtained for the VD-films of oxadiazole 1 by means of X-ray reflectivity, X-ray grazing incidence diffraction and atomic force microscopy (AFM) investigations indicate the formation of well ordered oxadiazole multilayers. The structure of the VD-multilayers is compared with that of Langmuir–Blodgett (LB) films and thermally treated LB-multilayers prepared from the same compound.

Electrochemical Behavior of Surfactants Containing an Anthraquinone Group and Their Application to the Formation of Organic Thin Films

Electrochemical Behavior of Surfactants Containing an Anthraquinone Group and Their Application to the Formation of Organic Thin Films

Formation of organic thin films at the liquid-solid interface studied by second harmonic spectroscopy

Self-assembly of ω-(p-nitroanilino) dodecane thiol (p-O 2N-C 6H 4-NH-(CH 2) 12SH) (NAT) on polycrystalline gold films by adsorption from solution was studied in situ with second harmonic generation (SHG). Depending on the wavelength different parts of the system are probed. At a fundamental wavelength of 1 064 nm thiol adsorption is monitored in real time by the formation of the sulfur-substrate bond. A linear dependence of the non-linear susceptibility from the thiol coverage describes the time-dependent SH signal quantitatively. In contrast, the nitroaniline (NA) end group measured at a SH wavelength of 350 nm exhibits a very different behavior. Phase-sensitive measurements carried out in situ reveal that an increase of the density of the film causes the phase of the SH signal from the NA moiety to advance. This phase shift which corresponds to a blue-shift of the resonance becomes effective for coverages higher than 0.4 and is explained by the repulsive interaction of the NAT molecules.

Formation of organic thin films by electrolysis of surfactants with the ferrocenyl moiety

The formation of organic thin films by controlled-potential electrolysis (oxidation) of an aqueous solution containing surfactants with a ferrocenyl moiety and an organic compound incorporated in micelles or in a dispersed organic pigment with use of the surfactants is examined

Application for Organic Thin Film Formation

Plasma chemical process for organic thin film formation was known as plasma polymerization. The process was outlined and characteristics of the films were introduced. Two kinds of polymer stractures were formed by plasma polymerization. Crosslinked polymers were formed from the most organic vapours in any kinds of reactors because monomers were highly dissociated in the high energy plasma. However functional polymers were also formed under the regulation of plasma using the monomers which were elements of functional polymers. Among several applications of the process, plasma polymerized resist formation and lithography processes were introduced.