Download or read book Investigating the Photophysics of Fluorescent Conjugated Polymer Chemosensors in the Solid State written by Sherryllene Sandrena Pinnock and published by . This book was released on 2011 with total page 412 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Investigating the Photophysics of Conjugated Polymer Chemosensors in the Solid State written by Justin Che and published by . This book was released on 2009 with total page 108 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Investigating the Photophysics of Fluorescent Conjugated Metallopolymer Chemosensors for Iron in Solid State Thin Films written by Sarah Dill and published by . This book was released on 2013 with total page 74 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Design Synthesis and Photophysics of Fluorescence turn on Conjugated Polymer Chemosensors written by Li-juan Fan and published by . This book was released on 2006 with total page 362 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Investigating the Photochemistry and Photophysics of Conjugated Polymers by Single Molecule Spectroscopy written by Dehong Hu and published by . This book was released on 1999 with total page 356 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Photophysical and Surface Characterization of Fluorescent Conjugated Polymer Fibers as Chemosensors for Iron Cations written by Bo Song (B.S.) and published by . This book was released on 2013 with total page 76 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Design Synthesis and Photophysics of Dipyrrolequinoxaline Receptor Loaded Fluorescent Conjugated Polymer Chemosensors written by Catherine N. Malele and published by . This book was released on 2009 with total page 320 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Synthesis and Photophysical Analysis of Structurally Modified Fluorescent Conjugated Polymer Chemosensor Backbones written by Zachary Louis Logozio and published by . This book was released on 2010 with total page 64 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Investigation of Fluorescent Conjugated Polymer Chemosensors for the Detection and Differentiation of Iron Cations written by Megan Elizabeth Audrey Fegley and published by . This book was released on 2014 with total page 378 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Energy transfer Enhanced Quenching in Fluorescent Conjugated Polymer Chemosensors written by Clifford B. Murphy and published by . This book was released on 2003 with total page 348 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Film Stabilizaiton and Photophysics of Unconventional Conjugated Polymers written by Kara Martin and published by . This book was released on 2018 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Conjugated polymers offer a unique opportunity to develop high performing, flexible, lightweight, and large area electronic devices. With advances in conjugated polymer understanding and synthesis, the use of polymers as active layer materials in electronic applications, rather than just substrate materials, has become more promising. However, defects in morphological stability, as well as imperfect electronic understanding, are still present, limiting the use of these materials in commercializable electronics. Fundamental understanding of structure-property relationships can allow for facile synthetic solutions to major drawbacks of conjugated polymer integration in standard device architectures. Chapter 1 presents background research on the history of conjugated polymer development and the electronic device architectures these materials are typically incorporated in. Chapter 2 presents the use of thiol-ene chemistry to stabilize poly(3-alkylthiophene) films through a grafting-to procedure. This offers a simple way to produce highly oriented, insoluble, semi-conducting films through facile synthetic tuning of the polymers end-groups and side chains. In Chapter 3, the photophysics of carborane containing poly(dihexylfluorene) polymers is discussed. These unique class of materials experience drastic solvatochromism making them highly coveted for simple sensing applications. Through extensive spectroscopic investigations, a complete understanding of the excited-state dynamics is presented. Chapter 4 extends on Chapter 3 by demonstrating a straightforward method to synthesize carborane containing poly(dihexylfluorene)s with emissive properties that change with fluorene conjugation length, allowing for emission color tuning of the polymer solid and solution states. Lastly, Chapter 5 presents the synthesis of novel poly(bisthienyl carborane) and poly(bisthienyl carborane-alt-thiophene) is presented. This is the first example of a soluble conjugated polymer implementing a strong donor aromatic group and a strong acceptor carborane junction in the repeat unit. The fascinating excited-state characteristics are determined through femtosecond and nanosecond spectroscopy, showing the polymer can promote triplet formation on the carborane unit, making it useful for triplet sensitization applications. The work presented in this thesis shows that straightforward synthetic techniques can be used to highly affect the properties of common conjugated polymers, making them more robust or beneficial for electronic applications. Side-chain and backbone engineering is a necessary technique for furthering the development of useful and applicable "plastic" electronics.

Download or read book Exploring the Selectivity of Fluorescent Conjugated Polymer Chemosensors Containing Toltyl terpyridine Receptors for Metal Cations written by Abigail Oakes and published by . This book was released on 2012 with total page 94 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Photophysics and Photochemistry of Conjugated Polymer Nanoparticles written by Scott N. Clafton and published by . This book was released on 2014 with total page 304 pages. Available in PDF, EPUB and Kindle. Book excerpt: Nanoparticles prepared by the reprecipitation of conjugated polymers are an exciting development in the field of biological imaging and fluorescence sensing. The colloidal stability of these hydrophobic polymers in aqueous suspension was found to originate from the surface charge density of ~15 mC/m2, which is in part attributed to negatively charged functional groups produced by polymer oxidation. The suitability of these nanoparticles in traditional conjugated polymer applications, such as polymer photovoltaics, was also investigated using femtosecond fluorescence upconversion and transient absorption spectroscopies. Polarisation resolved studies of energy transfer in highly compact nanoparticles and extended polymer conformations showed the nanoparticles exclusively undergo intermolecular energy transfer. These observations were supported by energy transfer simulations on polymer structures obtained from coarse-grained molecular dynamics simulations. Next, the recombination of polarons in composite rr-P3HT/PCBM nanoparticles, dominated by geminate recombination below 10 wt% PCBM, was demonstrated using a one dimensional diffusion model. This model also yielded the P3HT domain size of ~5 nm, which confirms these nanoparticles can serve as a model system for probing charge generation and recombination processes in device-like environments. Finally, the power dependent exciton decay in highly ordered nanowires yielded an exciton diffusion length of 11 ± 3 nm, which is toward the upper limit of diffusion lengths reported for annealed P3HT films. This data indicates the gentle solution based crystallisation of nanowires is a promising route for enhancing the performance of bulk heterojunction devices.

Download or read book Diverse Highly Sensitive Fluorescence Sensor Libraries Instrumentation for the Investigation of Functionalized Conjugated Polymer Assemblies written by Timothy Swager and published by . This book was released on 1999 with total page 4 pages. Available in PDF, EPUB and Kindle. Book excerpt: The equipment purchased with this grant has been used to process and analyze conjugated polymers with diverse structures. Fluorescent conjugated polymers have been under investigation in our laboratory as ultra-sensitive sensory materials. A Langmuir-Blodgett film deposition system was purchased for the molecular processing of these sensory polymers into highly aligned structures with optimal energy transport properties. These studies have been used to create precise nanostructures of polymers. Another outcome of the Langmuir-Blodgett studies is the formation of films that can interface with analytes and receptors in aqueous environments, which represents a critical step toward the formation of biosensor hybrid structures. A monochromatic UV-Vis light source was purchased to he used with a polarizing microscope. This system has been useful for the investigation of emissive liquid crystalline assemblies. To conduct detailed photophysical studies a fluorescence system was purchased. The impact of this equipment is readily apparent from the publications listed in the Supplementary Notes.

Download or read book Investigation of Photophysical and Photochemical Processes in Conjugated Polymer Nanoparticles by Single Particle and Ensemble Spectroscopy written by and published by . This book was released on 2009 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Investigation of photophysical and photochemical processes in conjugated polymer nanoparticles by single particle and ensemble spectroscopy.

Download or read book Enhanced Photophysics of Conjugated Polymers written by and published by . This book was released on 2003 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The addition of oppositely charged surfactant to fluorescent ionic conjugated polymer forms a polymer-surfactant complex that exhibits at least one improved photophysical property. The conjugated polymer is a fluorescent ionic polymer that typically has at least one ionic side chain or moiety that interacts with the specific surfactant selected. The photophysical property improvements may include increased fluorescence quantum efficiency, wavelength-independent emission and absorption spectra, and more stable fluorescence decay kinetics. The complexation typically occurs in a solution of a polar solvent in which the polymer and surfactant are soluble, but it may also occur in a mixture of solvents. The solution is commonly prepared with a surfactant molecule:monomer repeat unit of polymer ratio ranging from about 1:100 to about 1:1. A polymer-surfactant complex precipitate is formed as the ratio approaches 1:1. This precipitate is recoverable and usable in many forms.

Download or read book Experimental Investigations of Excited state Dynamics in Conjugated Polymers Using Time resolved Laser Spectroscopy written by Edward William Snedden and published by . This book was released on 2011 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: In this thesis, time-resolved laser spectroscopy has been used to advance the understanding of the excited-state dynamics in a variety of conjugated polymers and related systems. The properties of electron-phonon coupling in the conjugated polymer ladder-type methyl-substituted poly(para-phenylene) have been investigated using steady-state and picosecond fluorescence spectroscopy, with results demonstrating the thermal population of low energy stretching modes of the polymer backbone in the excited-state after thermalisation. Polarised measurements are used to demonstrate a fundamental relationship between the vibrational mode of the polymer through which fluorescence occurs and the corresponding fluorescence polarisation. Time-resolved measurements confirmed that the electron-phonon coupling in the polymer does not influence the fluorescence lifetime, with observations to the contrary attributed to the presence of an underlying defect state. Picosecond fluorescence spectroscopy has also been used to investigate the properties of intramolecular energy transfer between different monomer subunits in the conjugated copolymer Super Yellow. The photoluminescence quantum yield of the copolymer was measured and its relatively high value was attributed to the effect of the aforementioned energy transfer. Femtosecond pump-probe spectroscopy has been used to identify and characterise the properties of interchain exciton formation in ladder-type methyl-substituted poly(para-phenylene). This process was observed to occur with a time period of 1ps, which was attributed to the time required for a singlet exciton to become delocalised over adjacent polymer chains. Finally, delocalised polaron generation in blends of the regio-regular polythiophene poly(3-dodecylthiophene-2,5-diyl) with the electron acceptor [6,6]-phenyl-C61-butyric acid methyl ester was investigated using femtosecond pump-probe spectroscopy. Both the rate and yield of delocalised polaron formation were shown to be dependent on excitation energy, with the dissociation of geminate polaron-pairs making a substantial contribution to the yield. This latter observation is significant, as the geminate recombination of polaron-pairs constitutes a fundamental and inherent loss of potential delocalised polarons in this system.