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Showing 1 to 20 of 51 for “"Langmuir-Blodgett"”.
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Two dimensional Langmuir-Blodgett magnets
… of quasi-two-dimensional magnets formed by the Langmuir-Blodgett deposition of manganese stearate on aluminium foil has been measured at several points between 20 K and 0.4 K. Large area samples of 101 and 11 layers were detected by a SQUID magnetometer. With the magnetic field parallel to the …
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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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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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The synthesis and characterisation of Langmuir-Blodgett film forming TCNQ adducts.
… materials on the subphase and their resultant Langmuir-Blodgett (LB) film fabrication was studied. The abrupt change in molecular orientation in LB films of the gamma-bridged adducts occurring at R= C[15]H[31] and above was not seen in the more flatly orientated alpha-bridged adducts. Further …
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Langmuir Blodgett films of colloidal silicon quantum dots for hot carrier photovoltaics
… films of colloidal Si QDs are fabricated using Langmuir Blodgett (LB) technique, by reasonably tuning the conventional LB processes. Unique hot carrier related effects are revealed via a series of optical spectroscopies. Using Raman scattering, size-dependent phonon confinements and LB film …
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Host-Guest Assemblies for Functional Interfaces via Langmuir-Blodgett and Self-Assembly Technique
… surfaces, surface host-guest assemblies based on Langmuir-Blodgett and self-assembly technique have been employed as a model system as they may offer the potential ability to regenerate surface properties via intercalation of various functional guest molecules. This thesis ranges over the …
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Structural studies of Copper Tetra-Tert-Butyl Phthalocyanine Langmuir-Blodgett and vacuum deposited films
The Langmuir-Blodgett (LB) technique was employed to fabricate thzn films of Copper-Tetra-Tert-Butyl Phthalacyanine (CuTTBPc). However, CuTTBPc has a strong tendency to aggregate and hence inhibit the synthesis of uniform layers. It has been found that the incorporation of Arachidic Aczd (AA) can …
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Imaging of Heterogeneous Langmuir -Blodgett Monolayer with Compressive Sensing Sum Frequency Generation Microscopy and Brewster Angle Microscopy
… to chemically study surface heterogeneity. Langmuir Blodgett (LB) monolayers are widely used as standard models for cell membranes.
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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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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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The Synthesis and Fabrication of Two-Dimensional Polymers
… be fabricated into 2DPs by crystallization or Langmuir-Blodgett approach.Chapter One will explore how 2DPs are classified and showcase some of the current methods for the synthesis of 2DPs. The pros and cons of each method will be highlighted and potential applications of 2DPs will be …
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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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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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Alcohol surface chemistry in ultrahigh vacuum and at high pressure
… rather than forming densely packed films of a Langmuir-Blodgett type.
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Surface immobilization of engineered hemeproteins: Orientation, stability, structure, and function
… with recently developed self-assembly and Langmuir-Blodgett techniques can provide powerful tools to manipulate micro-structures of protein monolayers at solid/air and liquid/air interfaces.
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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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Using imperfect semiconductor systems for unique identification
… material, MoS2, were created by the Langmuir‐Blodgett technique for the first time and have laid the foundations for the formation of an optical analogue of an atomic‐PUF/UNO system. • Optoelectronically ‐ The Langmuir‐Blodgett technique’s flexibility was utilised to fabricate complex …
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