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Showing 1 to 20 of 77 for “"scanning tunneling microscope"”.
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Simulating scanning tunneling microscope measurements
One of the largest problems in scanning tunneling microscopy design is noise control. It is the burden of the designer to determine if money should be used to build a floating room for vibration isolation or for top-of-the-line preamplifiers that can be placed at low temperatures. This thesis …
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A Vertical Coarse Approach Scanning Tunneling Microscope
A Pan-style scanning tunneling microscope (STM), with a vertical coarse approach mechanism, was designed, built and tested. The microscope will be operated in ultra-high vacuum and also at cryogenic temperatures (8 K) inside a continuous flow cryostat. Fundamental differences in operating principle …
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Design and Construction of a Scanning Tunneling Microscope
… includes the design and construction of a Scanning Tunneling Microscope (STM). The purpose of this microscope is to study the surface structure of materials. The design phase will include making drawings to allow the specialized parts to be machined and acquiring the other materials needed …
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A scanning tunneling microscope control system with potentiometric capability
… and work that had already been done on the UCT scanning tunneling microscope (STM). This system is being developed in the Department of Electrical Engineering at UCT. It goes on to describe the continuation of the research work that was done for this dissertation on the STM at UCT. The work was …
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Modeling, control, and experimentation of a scanning tunneling microscope
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1994.
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The Design of a Scanning Tunneling Microscope for Electroluminescence Studies
A conventional scanning tunneling microscope (STM) provides topographical and tunneling spectra information of atomic structures. However, the extremely small lateral dimension of the tunneling filament is also responsible for locally exciting photon emission with low-energy electrons. By combining …
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Fabrication of nanostructures with the scanning tunneling microscope and the laser
… most advanced technologies: the laser and the scanning tunneling microscope (STM). Laser radiation is used to break the chemical bonds of gas-phase trimethylaluminum molecules to free aluminum atoms in the region of the tunneling gap of the STM. The atoms are subsequently selectively excited …
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Optical end point sensing and digital control of a scanning tunneling microscope
… this thesis is that of digitally controlling a Scanning Tunneling Microscope and implementing end point sensing to close the control loop for accurate X-Y positioning of the microscope tip. This first part entails modifying a microscope with an analog controller so that it may be interfaced to a …
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Silicon-Based Molecular Nanotechnology: Fabrication and Characterization With the Scanning Tunneling Microscope
… Si(100) surface with the ultra-high vacuum scanning tunneling microscope (UHV-STM). Nanoscale studies have revealed that the in situ H-passivated Si(100) surface remains atomically pristine even after exposure to ambient conditions. The robustness of this surface suggests its use as a …
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Silicon Nanoelectronic Devices Fabricated by Ultra-High Vacuum, Scanning Tunneling Microscope Nanolithography
Electrical and magnetotransport measurements are carried out at low temperature on various device geometries. Two-dimensional unpatterned delta-doped samples yield ohmic conduction and sharp positive magnetoconductance: a characteristic of a weakly localized electron gas. The 2D electron density …
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Surface modification in air with a scanning tunneling microscope developed in-house
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1994.
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Photoemission and scanning tunneling microscope studies of quantum well and metal layer structures
… examined using angle-resolved photoemission and scanning tunneling microscopy. In the past, research pertaining to electronic properties of quantum wells, interfaces, and superlattices has been mostly confined to the realm of semiconductor physics. However, the experiments described in this …
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Modification of an ultra-high-vacuum scanning tunneling microscope for silicon nanostructure fabrication
… two major modifications to an ultra-high-vacuum scanning tunneling microscope system are described: an update to the cooling plate structure for more effective cooling of the dipstick and sample holder, and the installation of a capillary doser for concentrating the precursor gas to the tip-ample …
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Degradation Studies of Ultrathin Silicon Oxide Under Electrical Stress Using a Scanning Tunneling Microscope
Submitted by Jesse Garrison (jagarris@illinois.edu) on 2012-01-17T18:25:40Z No. of bitstreams: 1 1999_hetrick.pdf: 3179100 bytes, checksum: 1456c9f34957d5afe213413ca490bce8 (MD5)
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The effect of probe tilt angle on the quality of scanning tunneling microscope measurements
The effect of probe tilt angle on the quality of Scanning Tunneling Microscopy (STM) measurements was explored. A small but consistent improvement in slope accuracy was documented lending some support to the effort to develop a new, five-axis STM capable of tilting in a controlled manner while …
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Fabrication of Metal and Organic Nanostructures on Silicon(100) With Scanning Tunneling Microscope-Based Lithography
"The scanning tunneling microscope (STM) has been employed for both atomic-scale characterization and modification of surfaces. The STM, for example, can be used to desorb hydrogen or deuterium from nanometer-sized regions of the H-passivated or D-passivated Si(100)-2 x 1 surface, resulting in …
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Large-scale graphene transfer in ultra-high vacuum and design of a low temperature ultra-high vacuum scanning tunneling microscope
… onto clean surfaces in an ultra-high vacuum scanning tunneling microscope chamber via a modified direct contact transfer method. A polyethylene terephthalate (PET) film was chosen as the material for supporting graphene during the in-situ transfer. Both a scanning electron microscope and an …
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In Situ Structural Study of Underpotential Deposition and Electrocatalysis on Gold(111) Electrodes
… electrodes. The application of the atomic force microscope (AFM), the scanning tunneling microscope (STM), and the surface x-ray scattering (SXS) to these UPD studies has provided in situ measurements from which we investigate factors that determine UPD surface structures and correlate these …
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Scanning tunneling microscopy of silicon(100) 2 x 1
… beam epitaxy (MBE), has been studied with the scanning tunneling microscope (STM) to attempt to clear up the controversy that surrounds previous studies of this surface. To this end, an ultra-high vacuum (UHV) STM/surface science system has been designed and constructed to study semiconductor …
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