Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 67 for “"dye molecules"”.
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High Pressure Studies of Triphenylmethane Dye Molecules (Photosensitization, Adsorption, Isomerism, Semiconductors, Surfaces)
High pressure studies of triphenylmethane (TPM) dye molecules at room temperature in this thesis are conducted in two experiments. In the first case, photocurrent measurements using an electrochemical cell technique have been made to study the effect of pressure to 10 kbar on the adsorption of the …
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Influence of the Matrix Environment on the Optical Properties of Incorporated Dye Molecules
… is concerned with solid solutions of organic dyes. The organic molecules are incorporated in both optically inert or active and in rigid or flexible matrices, respectively. Exclusively thin films prepared by physical vapor deposition are studied. The optical response of the systems, in …
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Electronic Excitation Energy Transport and Trapping in Dispersions of Dye Molecules in Rigid Media
… transport and trapping in dispersions of dye molecules in films of polymer and protein. Excitonic diffusion coefficients and effective concentrations of self-traps were evaluated by comparing luminescence decay curves to theoretical curves predicted by the YT-Pade model.
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Studies of interaction of dye molecules with TiO2 Brookite clusters for application in dye sensitized solar cells
Dye sensitized solar cells (DSSCs) have attracted rapid interest over the recent years with prospect of emerging as a viable alternative to conventional silicon based solar cells. The photoanode of DSSCs comprises of dye molecules anchored to the surface of semiconductors such as TiO2. However, the …
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The adsorption of bidens pilosa dye molecules onto TiO2 nanoparicle surfaces for optimization of light harvesting efficiency in dye sensitized solor cell: an experimental and theory study
… energy is a key global concern, as a result, Dye sensitized solar cells (DSSCs) have attracted a lot of attention in recent years due to their ease of preparation, low toxicity, and environmental friendliness. The current study describes the green synthesis of TiO2 nanoparticles as well as …
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Excited State Dynamics of Dyes Bound to Nanocrystals
Dye-sensitized nanoparticle (NP) or dye-NP systems consist of dye molecules bound to the surface of wide-bandgap semiconductor metal oxide NPs. The dye molecules absorb light, and the excited dye molecules then transfer an electron to the conduction band (CB) of the NP. These dye-NP systems are …
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Surface enhanced resonance Raman spectroscopy of dyes: semi-quantitative trace analysis
Herein analysis of dye molecules has been carried out by means of surface enhanced Raman spectroscopy (SERS) and/or surface enhanced resonance Raman spectroscopy (SERRS) using citrate- and/or borohydride-reduced silver colloids employing laser exciting wavelengths equal to 514.5 and/or 632.8 nm. …
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DNA origami substrates as a versatile tool for surface-enhanced Raman scattering (SERS)
… to perform selective experiments on individual molecules, two fundamental requirements have to be fulfilled. On the one hand, areas with high local field enhancement, so-called “hot spots”, have to be created by positioning the supporting metal surfaces in close proximity to each other. In most …
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Organic materials for holographic applications
… optical systems. A novel medium composed of azo dye molecules (methyl red sodium salt) and liquid crystals (PCB) was developed for holographic applications. A conformation change of azo dye molecules in cis-trans isomerization reorients liquid crystal molecules. Reversible polarization holograms …
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Surface Enhanced Raman Spectroscopy as a Tool for Waterborne Pathogen Testing
… parvum and Giardia lamblia and with organic dye molecules. The dye molecules, rhodamine B isothiocyanate (RBITC) and malachite green isothiocyanate (MGITC) were surface enhanced by the gold nanoparticles resulting in unique fingerprint SERS spectra. The SERS label method was successful in …
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Effects of Metallic Nanoalloys on Dye Fluorescence
… and the photostability of many fluorescent dye molecules. Metal enhanced fluorescence (MEF) is therefore widely investigated for biosensing applications. When used in immunoassays, silver island films (SIFs) could augment the fluorescence intensity of fluorescein by a factor of seventeen; …
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Structure-property relationships of dyes as applied to dye-sensitized solar cells
… of structural and photovoltaic properties of dyes used in dye-sensitized solar cells. Experimental methods, including ultraviolet-visible spectroscopy, fluorescence spectroscopy, cyclic voltammetry and electrochemical impedance spectroscopy are employed to study optical and electrochemical …
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Engineering the optical properties of luminescent solar concentrators at the molecular scale
… a biological light-harvesting complex, as dyes in the LSC collector to circumvent transport losses caused by photon re-absorption. The selfassembled structure of phycobilisomes couples numerous donor chromophores to a handful of acceptor chromophores through an internal F6rster energy …
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Surface plasmon enhanced fluorescence for biological imaging : from visible to short-wave infrared
… plasmonic nanoparticles and visible dye molecules on the viral capsid. Practical factors controlling fluorescence enhancement, such as nanoparticle size and dye-to-nanoparticle distance, are studied in this project. Lastly, the highly fluorescent probe is applied for in vitro staining …
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Development of Gold Nanocluster-Based Biosensors
… enhance the Raman intensity of the trapped dye molecules such that single nanocluster detection is feasible. To develop a gold nanoparticle-based biosensor for influenza virus, effort was also made to modify recognition moieties such as aptamers to gold nanoparticles via distinct approaches. …
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Reactions of Excited State Cationic Dyes
… and other reactions of excited state of organic dye molecules. Therefore, a transient spectrometer with a time resolution of 36 ps was designed and built; this is described in chapter 2. In the third chapter, intersystem crossing in a cyanine dye, induced by heavy atom counterions and heavy atom …
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Development of a dye sensitized photochemical reduction process for the degradation of polychlorinated biphenyls
… light bulbs, which is absorbed by a common dye sensitizer. The dye molecules, when excited by the absorption of light, can promote a chemical reaction between polychlorinated biphenyls and a hydrocarbon gas such as propane. In this chemical reaction, hydrogen is abstracted from the …
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Conjugation of Biological and Carbon Nanoparticles For Applications In Electronics and Cell Imaging
… or Selah Dots, were conjugated with fluorescent dye molecules to improve their fluorescent signal, and cell targeting ligands were conjugated to improve the cell targeting specificity. Preliminary results of cancer cell targeting show that conjugation of these ligands and fluorophores improve the …
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DNA Origami Structures for Artificial Light-Harvesting and Optical Voltage Sensing
… architectures, using components ranging from dye or protein molecules to metallic nanoparticles. In this thesis, we apply DNA nanotechnology for developing novel light-harvesting and optical voltage sensing nano-devices. We use the programmable positioning of dye molecules on a DNA origami …
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