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Bohn, Paul W. Zhang, Yumo 2015-09-25T22:14:37Z 2015-09-25T22:14:37Z 10000-01-01 1999 1999 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. Made available in DSpace on 2015-09-25T22:14:37Z (GMT). No. of bitstreams: 2 license.txt: 4848 bytes, checksum: 96035ab3f5e1c23cc7138a224ce498bd (MD5) 9953187.pdf: 4491027 bytes, checksum: 31f2d0b1568d5d9bdcd174f899cd2451 (MD5) Previous issue date: 1999 Embargo set by: Seth Robbins for item 85743 Lift date: Forever Reason: Restricted to the U of I community idenfinitely during batch ingest of legacy ETDs Restricted to the U of I community idenfinitely during batch ingest of legacy ETDs U of I Only 112 p. Thesis (Ph.D.)--University of Illinois at Urbana-Champaign, 1999. http://hdl.handle.net/2142/84462 (MiAaPQ)AAI9953187 eng Chemistry, Analytical 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 text Chemistry Chemistry University of Illinois at Urbana-Champaign Dissertation Ph.D.