Synthesis and analysis at the chemical interface of novel oligomers as candidates for molecular electronics

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dc.contributor.advisorTour, James M.
dc.creatorMaya, Francisco
dc.date.accessioned2009-06-04T08:16:43Z
dc.date.available2009-06-04T08:16:43Z
dc.date.issued2004
dc.description.abstractNew oligomers, intended for use as potential molecular electronics devices have been synthesized based on rational design principles. A large number of chemically and conformationally diverse molecules have been synthesized, in order to manipulate two physical characteristics of the oligomer: the molecular junction with the bulk phase material, and the molecular electronic behavior due to the conformational and electronic nature of the molecular backbone. For the former characteristic, the new oligomers contained various substrate linkers or "alligator clips", such as thioacetyl and free thiols, isonitriles, nitriles, pyridines groups, as well as diazonium salts for direct substrate attachment. For the latter characteristic, different molecular geometries were synthesized that contained electron-withdrawing groups such as fluorine atoms and nitro groups. These variations are meant to address redox processes, electron-localization and conformational restrictions of the conjugated oligomer, features that are thought to play active roles in the electrical responses of molecular electronic devices. The direct reaction of arenediazonium salts with the solid bulk phase allowed us to extend the molecular electronics field toward the preparation, characterization and use of organically grafted materials that are technologically important such as silicon and gallium arsenide semiconductors, palladium metallic surfaces and individual single-walled carbon nanotubes. The goals of this work include higher current densities, lower conductivity barriers and improved matching between molecular orbitals and the Fermi level from the bulk phase. Finally, through the synthetic work presented here, the importance of a complete and systematic analytical elucidation of the chemisorbed organic films made with these novel oligomers is emphasized, so that the quality and integrity of the chemical interface is better understood before the molecules are assigned as active elements in molecular electronic devices.
dc.format.extent564 p.en_US
dc.format.mimetypeapplication/pdf
dc.identifier.callnoTHESIS CHEM. 2005 MAYA
dc.identifier.citationMaya, Francisco. "Synthesis and analysis at the chemical interface of novel oligomers as candidates for molecular electronics." (2004) Diss., Rice University. <a href="https://hdl.handle.net/1911/18779">https://hdl.handle.net/1911/18779</a>.
dc.identifier.urihttps://hdl.handle.net/1911/18779
dc.language.isoeng
dc.rightsCopyright is held by the author, unless otherwise indicated. Permission to reuse, publish, or reproduce the work beyond the bounds of fair use or other exemptions to copyright law must be obtained from the copyright holder.
dc.subjectOrganic chemistry
dc.titleSynthesis and analysis at the chemical interface of novel oligomers as candidates for molecular electronics
dc.typeThesis
dc.type.materialText
thesis.degree.departmentChemistry
thesis.degree.disciplineNatural Sciences
thesis.degree.grantorRice University
thesis.degree.levelDoctoral
thesis.degree.nameDoctor of Philosophy
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