Characterization and reactivity of organic monolayers on gold and platinum surfaces

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dc.contributor.advisor Marc D. Porter
dc.contributor.author Wu, Chien-Ching
dc.contributor.department Chemistry
dc.date 2018-08-23T16:54:06.000
dc.date.accessioned 2020-06-30T07:05:32Z
dc.date.available 2020-06-30T07:05:32Z
dc.date.copyright Sat Jan 01 00:00:00 UTC 1994
dc.date.issued 1994
dc.description.abstract <p>The focus of this study is to understand how the immobilization, dielectric, orientation, composition, coverage, and structure of self-assembled organic monolayers on metal surfaces affects the surface reactivities and properties of these films in order to facilitate the construction of desired films;Two model systems used: tiols at gold and aromatic acids at platinum. Both methyl-and carboxylic acid-terminated thiolate monolayers were formed at evaporated gold films by the self-assembly technique via the thiol moiety of thiols. The phenylcarboxylic acid and pyridylcarboxylic acid monolayers were formed at platinum electrodes cleaned electrochemically in 1 N H[subscript]2SO[subscript]4 aqueous solution;Several surface analysis technologies (including contact angle measurement, electrochemistry, ellipsometry, infrared reflection absorption spectroscopy (IRRAS), and x-ray photospectroscopy) have been used to study the formation, composition, structure, surface properties and reactivity of self-assembled organic monolayers on gold and platinum surfaces;IRRAS, contact angle measurements, and an electrochemistry methods were used to determine the surface pK[subscript] a of phenylcarboxylic acids and pyridylcarboxylic acids monolayers on platinum;These techniques were also used to determine the orientation of polymethylene chain axis and the carboxylic follow the structural evolution of the chains and end group of the thiolate monolayers during formation;In addition, IRRAS was used to asses the carboxylic acid group in terms of its possible existence as the non-hydrogen-bonded species, the hydrogen-bonded dimeric group, and the hydrogen-bonded polymeric group. The existence of these different forms of the end group were also followed as a function of coverage and as well as their influence a reactivity as a function of solution pH;IRRAS and contact angle measurements were used to calculate the rate constant of the esterification of carboxylic acid-terminated monolayers on gold.</p>
dc.format.mimetype application/pdf
dc.identifier archive/lib.dr.iastate.edu/rtd/10525/
dc.identifier.articleid 11524
dc.identifier.contextkey 6405273
dc.identifier.doi https://doi.org/10.31274/rtd-180813-13035
dc.identifier.s3bucket isulib-bepress-aws-west
dc.identifier.submissionpath rtd/10525
dc.identifier.uri https://dr.lib.iastate.edu/handle/20.500.12876/63681
dc.language.iso en
dc.source.bitstream archive/lib.dr.iastate.edu/rtd/10525/r_9503610.pdf|||Fri Jan 14 18:22:56 UTC 2022
dc.subject.disciplines Analytical Chemistry
dc.subject.keywords Chemistry
dc.subject.keywords Analytic
dc.subject.keywords Chemistry
dc.subject.keywords Analytical chemistry
dc.title Characterization and reactivity of organic monolayers on gold and platinum surfaces
dc.type article
dc.type.genre dissertation
dspace.entity.type Publication
relation.isOrgUnitOfPublication 42864f6e-7a3d-4be3-8b5a-0ae3c3830a11
thesis.degree.level dissertation
thesis.degree.name Doctor of Philosophy
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