Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 20 of 68 for “"Scanning Tunneling Microscopy (STM)"”.
-
The application of scanning tunneling microscopy (STM) and related techniques to the study of organic and biomolecular targets
Scanning tunneling microscopy (STM) has been used to study: (a) Self-assembled monolayers and sub-monolayers of butanethiol adsorbed onto highly uniform Au/mica films, (b) DNA adsorbates on different substrates prepared by different deposition techniques. In addition, surface preparation techniques …
-
In situ studies of the binding and reactivity of small molecules at metal electrode surfaces
… polymerizes. Oligomers have been observed with scanning tunneling microscopy (STM).
-
Scanning tunneling microscopy of III-V semiconductors
Scanning tunneling microscopy (STM) has been used to study the (100) surface of GaAs and the (110) plane of cross-sectioned GaAs/AlGaAs heterolayers. Observation of the GaAs(100) surface with STM has characterized the c(8x2) reconstruction and shows that the c(8x2) consists of ordered (4x2) …
-
Scanning tunneling microscopy and spectroscopy of tip-induced direct writing of nanometallization in ultra-high vacuum
This thesis discusses scanning tunneling microscopy (STM) nanometallization on Si(100):H of HfB2 and MgB2. We first give an introduction to graphene nanoribbons (GNRs) along with STM and the techniques therein. We found that with STM, self-standing nanoscale features including dots, wires, and 3D …
-
Atomic-level investigation of fluorinated single-wall carbon nanotubes
… of fluorinated SWNTs (fluorotubes) performed by scanning tunneling microscopy (STM). This research was performed for various compositions of fluorinated nanotubes. In addition, the atomic-scale fluorine coverage on the fluorotubes with composition was observed as a function of annealing …
-
Interaction between vortices and impurities in a d-wave superconductor /
… we will present a theoretical analysis of the scanning tunneling microscopy (STM) data in BSCCO. We introduce the Bogoliubov-De Gennes Hamiltonian and solve it numerically on a two-dimensional 20 x 20 lattice under a magnetic field perpendicular to the surface. We consider a vortex at the …
-
Exploration of the Structure and Catalytic Activity of Modified Platinum Substrates
… the catalyst toward methanol electrooxidation. Scanning Tunneling Microscopy (STM), X-Ray Photoelectron Spectroscopy (XPS) and electrochemical methods are ideal techniques to probe the structure and catalytic activity of platinum surfaces modified by noble metal adatoms. STM and XPS studies …
-
Structural study of electrochemically induced adsorption and diffusion of metal surfaces
In the first part of this thesis, the scanning tunneling microscopy (STM) was used to characterize adsorbates physisorbed onto conductive surfaces. The STM is ideal for this because it is capable of obtaining real space images of local electronic and topographic features with atomic resolution. It …
-
Photoemission and scanning tunneling microscopy investigation of elemental-semiconductor surfaces
… by studying the resulting surface structures by scanning tunneling microscopy (STM), a quantitative description of the interaction and reaction between adsorbate and surface can be obtained. The photoemission method allows a distinction between atoms in different layers and in inequivalent sites …
-
Scanning tunneling microscopy and spectroscopy of wet chemically synthesized porous graphene nanoribbons on hydrogen passivated silicon (100)
… The porous GNRs are characterized in UHV using scanning tunneling microscopy (STM) and scanning tunneling spectroscopy (STS). A unique electronic feature is observed at the pore sites in the STM topographic images. STS measurements indicate the presence of the pores significantly increases the …
-
Magnetic and critical behavior of thin terbium(0001)/tungsten(110) films studied by electron capture spectroscopy (ECS)
… substrates and the Tb films are checked using scanning tunneling microscopy (STM), Auger electron spectroscopy (AES) and low-energy and high-energy electron diffraction (LEED and RHEED). Using electron capture spectroscopy (ECS), the surface electron spin polarization of the Tb(0001) films is …
-
Fullerene hydrides and studies toward the syntheses of fulvalenes
… hydrogen is covalently attached to the tubes. Scanning Tunneling Microscopy (STM) images of the hydrogenated tubes show bright regions around the circumference of the tube that most likely correspond to the region covered by hydrogen. Precursors of two fulvalenes (calicene and triafulvalene) …
-
Scanning tunneling microscopy investigations of transition metal dichalcogenide 1t-tantalum disulfide and zigzag-shape graphene nanoribbons in ultra-high vacuum
… on hydrogen passivated silicon substrate through scanning tunneling microscopy (STM). Dry contact transfer allows unperturbed transfer and exfoliation of desired two-dimensional (2D) layered materials onto a desired substrate under ultra-high vacuum (UHV), to largely prevent potential solvent and …
-
Probing the two-dimensional assembly of inorganic complexes and heterocycles for sensing applications
… analyte gases relevant for chemical sensing. Scanning Tunneling Microscopy (STM) was used as a primary tool to better understand the changes to a sensing system at the molecular level. In a similar vein, several platinum complexes useful as luminescence-based chemical sensors were studied …
-
Optically-Assisted Scanning Tunneling Microscopy
Scanning tunneling microscopy (STM) consistently provides the highest spatial resolution among the scanning probe methods, allowing surfaces to be investigated on the atomic level. With the addition of optical excitation, STM promises to become a powerful technique for single molecule spectroscopy, …
-
Parallel Plasma Field Directed Sputter Sharpening of Field Emitters
… designed and built, and tungsten tips for use in scanning tunneling microscopy (STM) applications were sputtered with argon ions. The result is that as the tip voltage bias to plasma voltage bias ratio is increased above approximately 0.1, the cone angle of the tungsten tip decreases. The radius …
-
STM studies of the nanoscale electronic landscape of the cuprates
Scanning tunneling microscopy (STM) studies of the high-T superconductors have led to a number of important discoveries. In particular, STM has revealed spatial patterns in electronic density due to phenomena such as checkerboard order and quasiparticle interference. This thesis presents two …
-
Design of an STM and EPL control system and linear actuator preload diaphragm
… The system will also be capable of Scanning Tunneling Microscopy (STM), which is will locate the surface with the precision necessary for EPL and also allow the user to confirm the machined features immediately after machining. The import of this work is the development of a low-cost …
-
Multiscale Insights into Molecular Interfaces: STM Imaging and Ultrafast Laser-Induced Dynamics
… at interfaces by integrating high-resolution scanning tunneling microscopy (STM) with advanced spectroscopic and ultrafast laser techniques. Focusing on cyclopentadienyltricarbonylmolybdenum dimer (CPTCMD) as a model metallocene, the study demonstrates how a customized liquid-phase STM cell …
-
Integration of Single -Walled Carbon Nanotubes With Gallium Arsenide(110) and Indium Arsenide(110) Surfaces: A Scanning Tunneling Microscopy Study
… on supported carbon nanotubes, we have used scanning tunneling microscopy (STM) and spectroscopy (STS) to investigate the physical and electronic behavior of single-walled carbon nanotubes (SWNTs) coupled to GaAs(110) and InAs(110) substrates in ultrahigh vacuum (UHV). Both flat and stepped …
Page 1 of 4