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Showing 1 to 17 of 17 for “"Langmuir-Blodgett films"”.
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Electronic Properties and Langmuir-Blodgett Films of Discotic Organic Semiconductors
… substituted tetraazaporphyrin (TAP) dyes in Langmuir-Blodgett (LB) monolayers (Chapter 5) is the generation of self-assembled monolayers with the elusive face-on orientation of the TAP macrocycles. Monolayers are formed only by the TAP derivatives with the longest tested aliphatic spacer …
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Investigations of the optoelectronic behaviour of novel phthalocyanine Langmuir-Blodgett films.
… phthalocyanines, molecularly engineered for Langmuir-Blodgett deposition by M. Cook at the University of East Anglia. The Langmuir-Blodgett method is used to deposit the two materials in the Y-form, onto substrates of glass and gold plated glass, and on quartz with interdigitated platinum …
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Langmuir Blodgett films of colloidal silicon quantum dots for hot carrier photovoltaics
… colloidal Si QDs into uniform close packed films and investigates carrier dynamics in such films, and subsequently proves that Si QDs can be employed as qualified hot carrier absorber materials. Uniform close packed single and multiple-layer films of colloidal Si QDs are fabricated using …
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Poly(L-Lactic Acid) Langmuir Monolayers at the Air/Water Interface and Langmuir-Blodgett Films on Solid Substrates: Phase Behavior, Surface Morphology, and Crystallinity
… processes. This dissertation provides the Langmuir-Blodgett (LB) technique as a mechanism for fabricating PLLA substrates at temperatures where PLLA degradation is uncommon. In order to fully understand surface morphologies of PLLA LB-films, studies of Langmuir monolayers at the air/water …
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Synthesis of functional polyimide and its application in nanostructured films
… treatment shows uniform porous structure. Langmuir-Blodgett films were fabricated with the as-synthesized polyimide and the modified polyimide. The carboxylic polyimide Langmuir-Blodgett film can be obtained after thermal treatment at lower temperature than typical imidization temperature. …
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Structural Characterization of Sulfur-Based Monomolecular Thin Films: I. Langmuir-Blodgett Films Derived From Multisulfur Heterocycles. II. Second Harmonic Generation Studies of Alkanethiolates on Ag and Au
Optical second-harmonic generation (SHG) has been used as a very sensitive surface probe to study metal-electrolyte interfaces at potentials within the double layer charging region. In this work, the potential dependence of second harmonic (SH) signal from metal/thin film/electrolyte systems have …
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Donor-Sigma-Acceptor (D-sigma-A) Molecules With Perylenebisimide Acceptors Having Alkyl or Peg Swallowtails With Sulfur or Hydroxyl Anchors: Synthesis and Applications in Langmuir-Blodgett Films, Single Molecule Spectroscopy (SMS), G-Quadruplex Studies and Passivation of Gold Nanoparticles
… when arranged with a proper orientation as Langmuir-Blodgett (LB) films and fixed between two electrodes, act as one-electron organic rectifiers (allowing the passage of current in one direction). In this work perylenetetracarboxylic bisanhydride is used as the acceptor. …
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Synthesis of polyionic tetraazaporphyrins and their Langmuir-Blodgett properties.
… 5, and 10 methylene groups were studied by the Langmuir Blodgett technique at different pH values of the aq. subphase. Rigid Langmuir films of molecules with face-on orientation of the macrocycle were obtained, and could be transferred onto hydrophilic substrates by Z-deposition. Langmuir films …
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Electrical characterization of large-area donor-acceptor molecular junctions
… molecular junctions show current rectification. Langmuir-Blodgett deposition onto thermally evaporated gold yielded four out of the five monolayers. The fifth system was as a monolayer formed by self-assembly onto template-stripped gold. Of the four Langmuir-Blodgett films studied, three had …
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Relaxation mechanism in methyl stearate monolayer films at the air/water interface
… support the proposed relaxation mechanism. The Langmuir-Blodgett films of methyl stearate, deposited before and after the catastrophic film collapse, revealed interesting structural features of the collapsed film. The experimental results from the pressure-time, area-time, and pressure-area …
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The Reactivity of Chemical Warfare Agent Simulants on Carbamate Functionalized Monolayers and Ordered Silsesquioxane Films
… applied toward the creation of well-ordered thin films containing carbamate linkages. In addition, novel trisilanolphenyl-polyhedral oligomeric silsesquioxane (POSS) molecules were used to create Langmuir-Blodgett films containing reactive silanol groups that have potential use as sensors and …
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Tailoring functional Π-conjugated polymers and molecules for organic photovoltaic applications
… candidate for depositing organic materials. Langmuir-Blodgett (LB) is an LbL technique that can achieve a true molecular monolayer buildup. In the next section of this dissertation, thin-film characterizations will be the main focus, especially on morphological and structural studies on the …
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Synthesis, redox properties, and langmuir monolayer formation of selected 3d- and 4d- metalloamphiphiles
… potential towards the fabrication of responsive films. This dissertation confers the synthesis and analysis of film forming properties of various redox-active metalloamphiphiles. Two new azido and thiocyanto bridged copper-based amphiphiles were synthesized and characterized by IR, UV-visible, …
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Stability and Morphological Evolution in Polymer/Nanoparticle Bilayers and Blends Confined to Thin Film Geometries
… spontaneous hole formation in amorphous polymer films and phase separation in multicomponent polymer films can hinder the stability of these systems at elevated temperatures. Hence, fundamental understanding of dewetting and phase separation in polymer/nanoparticle bilayer and blend films is …
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Optical and thermal characteristics of thin polymer and polhedral oligomeric silsesquioxane (POSS) filled polymer films
… technique for characterizing ultrathin polymeric films. By conducting the experiments in different ambient media, multiple incident media (MIM) ellipsometry, simultaneous determinations of a film's thickness and refractive index are possible. Poly(tert-butyl acrylate) (PtBA) films serve as a model …