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Title:Studies of Structure and Reactivity in Monolayer Assemblies: 1. Ozonolysis of Alkanethiolate Self Assembled Monolayers on Au. 2. In-Plane Resistivity of Ultrathin Gold Films as a High Sensitivity, Molecularly Differentiated Probe of Chemisorption at the Liquid-Metal Interface
Author(s):Zhang, Yumo
Doctoral Committee Chair(s):Bohn, Paul W.
Department / Program:Chemistry
Degree Granting Institution:University of Illinois at Urbana-Champaign
Subject(s):Chemistry, Analytical
Abstract:Ultrathin gold films, with thicknesses between the onset of conductivity (d ∼ 5 nm) and the electron mean free path ( d ∼ 80 nm), display surface-sensitive resistivities, which have been exploited to follow the adsorption and desorption of molecular monolayers at the metal solution interface with high precision. For nominal Au film thicknesses (d ∼ 40 nm), strongly chemisorbed thiolate monolayers increase the resistivity of the thin Au films by ca. 4%, but weakly adsorbed species, such as pyridine or phenolate at open circuit, induce no observable change in the Au film resistance. Resistivity measurements implemented with a high stability current source and high-precision digital voltmeter sampling at 1 Hz resulted in 3 sigma uncertainties in alkanethiolate coverage of 1.4 x 10--4 monolayer. Correlating chemical manipulations with changes in surface morphology as characterized by AFM indicates a significant morphology-related contribution to resistivity which must be controlled to extract meaningful information related to the electronic interaction of adsorbate and substrate.
Issue Date:1999
Description:112 p.
Thesis (Ph.D.)--University of Illinois at Urbana-Champaign, 1999.
Other Identifier(s):(MiAaPQ)AAI9953187
Date Available in IDEALS:2015-09-25
Date Deposited:1999

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