Browsing by Author "Banaszak Holl, M. M."
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Item Open Access Formation of alkylsilane-based monolayers on gold(American Chemical Society, 2002) Owens, T. M.; Nicholson, K. T.; Banaszak Holl, M. M.; Süzer, S.The formation of monolayers of alkylsilanes on a gold surface is characterized by X-ray photoelectron and reflection-absorption infrared spectroscopies. The reaction occurs through the activation of multiple Si-H bonds. Reactivity of the newly synthesized systems to oxygen and water is reported. Copyright © 2002 American Chemical Society.Item Open Access Soft x-ray photoemission studies of Hf oxidation(A I P Publishing LLC, 2003) Süzer, Şefik; Sayan, S.; Banaszak Holl, M. M.; Garfunkel, E.; Hussain, Z.; Hamdan, N. M.Charging of oxide films under x rays is an important issue that must be taken into consideration for determination of core-level binding energies as well as valence band offsets. Measurements are taken as a function of time, thickness, and annealing condition. Photoemission results show the presence of metallic Hf with the 4f7/2 binding energy of 18.16 eV, and at least one clear suboxide peak.Item Open Access Variable energy x-ray photoemission studies of alkylsilane based monolayers on gold(American Chemical Society, 2003) Owens, T. M.; Süzer, S.; Banaszak Holl, M. M.Gaseous n-hexylsilane (C6H13SiH3), n-octylsilane (C8H17SiH3), and n-octadecylsilane (C18H37SiH3) have been vapor deposited in ultrahigh vacuum (UHV) on freshly evaporated gold surfaces to form monolayers. Surface sensitive X-ray photoemission studies utilizing synchrotron radiation in the 160-360 eV range have been used to characterize these systems. Analyses of the C 1s, Si 2p, and Au 4f and valence band regions permit a structural assessment of the monolayer. The full width at half-maximum of the Si 2p and C 1s core levels, 0.4 and 1.2 or 1.1 eV, respectively, suggest the monolayers are chemically homogeneous. The intensity variation of the Au 4f and Si 2p core levels at different photon energies indicate the surface coverage of the monolayer is ∼96% and the chain orientation is upright on the surface, not parallel to the surface. The valence band of the alkylsilane monolayers exhibit features at ∼-13.2, -14.6, -16.3, -17.6, and -18.9 eV that agree well with those observed for alkyl chains of the same length.