rdf-syntax-grammar
mods:
  schema location: http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
  title info:
    title: Charge transport through organized organic assemblies in confined geometries
  name:
    name part: Schuckman, Amanda.
    role:
      role term: creator
  name:
    name part: Batteas, James D.
    role:
      role term: thesis advisor.
  type of resource: text
  genre: bibliography
  origin info:
    place:
      place term: txu
    date issued: 2012
    issuance: monographic
  language:
    language term: eng
  physical description:
    form: remote
    extent: 1 online resource.
  abstract: Organic molecules such as porphyrins and alkanethiols are currently being investigated for applications such as sensors, light-emitting diodes and single electron transistors. Porphyrins are stable, highly conjugated compounds and the choice of metal ion and substituents bound to the macrocycle as well as other effects such as chemical surrounding and cluster size modulate the electronic and photonic properties of the molecule. Porphyrins and their derivatives are relatively non-toxic and their very rich photo- and electro-chemistry, and small HOMO-LUMO gaps make them outstanding candidates for use in molecularly-enhanced electronic applications. For these studies, self-assembled tri-pyridyl porphyrin thiol derivatives have been fully characterized on Au(111) surfaces. A variety of surface characterization techniques such as Atomic Force Microscopy (AFM), Scanning Tunneling Microscopy (STM), FT-IR spectroscopy and X-ray photoelectron spectroscopy (XPS) have been implemented in order to obtain information regarding the attachment orientation based on the angle and physical height of the molecule, conductivity which is determined based on the apparent height and current-voltage (I-V) measurements of the molecule, conductance switching behavior due to conformational or other effects as well as the stability of the molecular ensembles. Specifically, the transport properties of free base and zinc coordinated tri-pyridyl porphyrin thiol molecular islands inserted into a dodecanethiol matrix on Au(111) were investigated using STM and cross-wire inelastic electron tunneling spectroscopy (IETS). The zinc porphyrin thiol islands observed by STM exhibited reversible bias induced switching at high surface coverage due to the formation of Coulomb islands of ca. 10 nm diameter driven by porphyrin aggregation. Low temperature measurements (~ 4 K) from crossed-wire junctions verified the appearance of a Coulomb staircase and blockade which was not observed for single molecules of t…
  note: by Amanda Eileen Schuckman.
  note: "Major Subject: Chemistry"
  note: Electronic resource.
  note: Doctor of Philosophy Texas A&M University 2011 http://hdl.handle.net/1969.1/ETD-TAMU-2011-05-9055
  note: Includes bibliographical references.
  note: Text (Dissertation)
  subject:
    topic: Major Chemistry
  subject:
    topic: STM
  subject:
    topic: self-assembled monolayers (SAMs)
  subject:
    topic: IETS
  subject:
    topic: chemistry of surfaces
  subject:
    topic: nanofabrication
  subject:
    topic: DFT calculations
  subject:
    topic: Nanoscale materials and devices
  subject:
    topic: current-voltage (I-V) spectroscopy
  subject:
    topic: XPS
  subject:
    topic: alkanethiol
  subject:
    topic: molecular electronics
  subject:
    topic: scanning probe lithography
  subject:
    topic: AFM
  subject:
    topic: FT-IR
  subject:
    topic: UV-Vis
  subject:
    topic: Au surfaces
  subject:
    topic: charge transport
  subject:
    topic: nanografting
  subject:
    topic: porphyrin
  identifier: http://hdl.handle.net/1969.1/ETD-TAMU-2011-05-9055
  record info:
    record content source: TXA
    record creation date: 120808
    record change date: 20150922105907.0
    record identifier: in00002779742