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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
111

Growth and structure of an ultrathin tin oxide film on Rh (111)

Varga, P., Schmid, M., Muto, S., Tatsumi, K., Matsui, T., Tajima, D., Yuhara, J. 01 1900 (has links)
No description available.
112

Structure and Electronic Properties of Phthalocyanine Films on Metal and Semiconductor Substrates

Bidermane, Ieva 14 March 2014 (has links) (PDF)
The thesis presents fundamental studies of phthalocyanines (Pc), a group of organic macro-cycle molecules, similar to systems found in nature. The use of phthalocyanine molecular films in devices with a variety of possible technological applications has been the reason of the many studies during the last decades. Core and valence photoelectron spectroscopies (PES), X-ray absorption spectroscopy (XAS) and scanning tunneling microscopy (STM) techniques are used to study Pc molecules in gas phase and adsorbed on gold Au(111) and silicon Si(100)-2x1 substrates. Density function theory (DFT) is used to obtain further insights in the electronic structure of the phthalocyanines.We aim to obtain a deeper understanding of the molecule-molecule and molecule-substrate interactions, a fundamental requirement for improving devices based on organic materials. Gas phase PES experiments and DFT calculations performed on different Pcs show the influence of the metal atom on the valence band spectra, where FePc and H2Pc HOMO is formed from C2p states, whereas MnPc has mainly Mn3d character.PES and STM studies of H2Pc and LuPc2 on Au(111) show a formation of a monolayer for H2Pc and a bi-layer of LuPc2 at lower thicknesses. XAS studies show a parallel to surface orientation of both H2Pc and LuPc2 with a change in tilt angle of the molecules with increasing thickness.A comparison of LuPc2 adsorbed on pristine and passivated Si surfaces show a bulk-like LuPc2 character on passivated Si, whereas a surface induced difference in adsorption geometry is evidenced on pristine Si and two energetically different adsorption geometries are proposed.
113

Structure and Electronic Properties of Phthalocyanine Films on Metal and Semiconductor Substrates

Bidermane, Ieva January 2014 (has links)
The current thesis presents fundamental studies of phthalocyanines (Pcs), a group of organic macro-cycle molecules. The use of phthalocyanine molecular films in devices with a variety of possible technological applications has been the reason of the many studies dedicated to such molecules during the last decades. Core and valence photoelectron spectroscopies (PES), X-ray absorption spectroscopy (XAS) and scanning tunneling microscopy (STM) techniques are used to study phthalocyanine molecules in gas phase and adsorbed on gold (111) and silicon Si(100)-2x1 substrates. Density functional theory (DFT) is used to obtain further insights in the electronic structure of the phthalocyanines. The aim of our studies is to get a deeper understanding into the molecule-molecule and molecule-substrate interactions, a fundamental requirement for improving the devices based on such molecular materials. Gas phase PES and XAS studies and single molecule DFT calculations are performed on the valence band (VB) of iron phthalocyanine (FePc), manganese phthalocyanine (MnPc) and metal-free phthalocyanine (H2Pc). The VB simulations have shown how the metal atom of the Pc influences the inner valence states of the molecules. The HOMO of the H2Pc and FePc is formed by mostly C2p states, whereas the HOMO of MnPc has mainly Mn3d character. PES studies of H2Pc on Au(111) have revealed the influence of the surface on the adsorption of the monolayer. XAS studies indicate formation of ordered monolayer with the Pc ligands parallel to the surface and the change of the molecular tilt angle with increasing thicknesses. For LuPc2 adsorbed on Au(111), STM study demonstrates a formation of bilayer instead of a monolayer. A comparison between the results of LuPc2 adsorbed on pristine or passivated Si(100)-2x1 confirmes the different reactivities of these surfaces: LuPc2 retains many molecular-like characters, when adsorbed on the innert passivated Si. Instead, on the more reactive pristine Si surface, the spectroscopic results have indicated a more significant interaction, possible hybridization and charge redistribution between the molecules and the surface. Moreover, STM images show a modification of the geometrical shape of the molecules, which are proposed to adsorb in two different geometries on the pristine Si surface.
114

The scanning probe microscopy study of thin polymer films

Harron, Hamish Robert January 1995 (has links)
No description available.
115

Exploiting molecular machines on surfaces

Mendoza, Sandra Marina, January 2007 (has links)
Proefschr. Rijksuniversiteit Groningen. / Met lit. opg.-Met samenvatting in het Nederlands en Spaans.
116

Scanning tunneling microscopy investigation of rock-salt and zinc-blende nitrides grown by molecular beam expitaxy /

Al-Brithen, Hamad Abdulaziz. January 2004 (has links)
Thesis (Ph.D.)--Ohio University, November, 2004. / Includes bibliographical references (p. 180-191)
117

Scanning tunneling microscopy investigation of rock-salt and zinc-blende nitrides grown by molecular beam expitaxy

Al-Brithen, Hamad Abdulaziz. January 2004 (has links)
Thesis (Ph.D.)--Ohio University, November, 2004. / Title from PDF t.p. Includes bibliographical references (p. 180-191)
118

Single molecule switches and molecular self-assembly low temperature STM investigations and manipulations /

Iancu, Violeta. January 2006 (has links)
Thesis (Ph.D.)--Ohio University, August, 2006. / Title from PDF t.p. Includes bibliographical references.
119

Aggregation of gold clusters by complementary hydrogen bonding

Brom, Coenraad Richard van den. January 2006 (has links)
Proefschrift Rijksuniversiteit Groningen.
120

Developing alternating current scanning tunneling microscopy and atomic force microscopy to measure thin film properties on the nanoscale /

Szuchmacher, Amy L. January 2000 (has links)
Thesis (Ph. D.)--University of Washington, 2000. / Vita. Includes bibliographical references (leaves 239-244).

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