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    Characterization of Porphyrin Thiol Assemblies on Au (111)

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    Undergraduate Thesis (723.7Kb)
    Date
    2011-08-04
    Author
    Webb, Kathryn M.
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    Abstract
    Numerous studies have been conducted using porphyrin molecules on various substrates to investigate their diverse photoelectrochemical, catalytic, electronic, and biochemical properties. These properties make porphyrin molecules targets for use as active components in devices such as chemical sensors, information storage, and photo sensitizers in solar cells. In this study, we investigated the assembly and aggregation of mono-podal zinc (II) porphyrin molecules into a dodecanethiol self-assembled monolayer (SAM) on gold. The porphyrin macrocycle is attached to a phenyl linking group and an alkanethiol tether which binds to the gold surface. The charge transport properties of the porphyrin in confined geometries are being investigated based on previous studies of aggregated assemblies on gold surfaces. In these studies, we find small islands of porphyrins to produce unique electrical switching behavior not observed in single molecules. To explore how island size influences the electrical properties of these compounds, we are investigating ways of creating well defined directed assemblies of controlled nanoscale dimension ranging from 10 to 100 nm in size by Atomic Force Microscopy. This research will facilitate the development of nanoscale and molecularly enhanced devices for applications such as light harvesting or sensing.
    URI
    http://hdl.handle.net/1969.1/98372
    Subject
    Nanograft
    Nanoshave
    Zinc (II) Porphyrin
    Thiol
    Alkanethiol Monolayer
    Fourier-Transform Infrared Spectroscopy
    Scanning Tunneling Microscopy
    Self-Assembled Monolayers
    Lithography
    Atomic Force Microscopy
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    • Undergraduate Research Scholars Capstone (2006–present)
    Citation
    Webb, Kathryn M. (2011). Characterization of Porphyrin Thiol Assemblies on Au (111). Available electronically from http : / /hdl .handle .net /1969 .1 /98372.

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