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Showing 1 to 20 of 38 for “"Scanning Tunneling Microscope (STM)"”.
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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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A scanning tunneling microscopy study of metal films and supported gold particles
A new type of Scanning Tunneling Microscope (STM) was designed and constructed to study the surface morphology of small catalyst particles. This is the first application of the STM in the study of supported metal particles. The STM was used to study the surface morphology of Au/Pd films that were …
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Fabrication and Transport Properties of Silicon Nanoelectronic Devices
… these structures are nanowires fabricated with a scanning tunneling microscope (STM). These high-density nanowires display the low-temperature phenomena of weak localization and one-dimensional conduction. Long-term applications of such nanowires and derivative devices include alternatives to …
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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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STM Lateral Micropositioning: A Tool for Nanofabrication
A concentric tube scanning tunneling microscope (STM) has been fitted with a lateral micropositioning device in order to allow imaging of surfaces over a range of a few millimeters. The probe is mounted on a stage which uses the principle of piezoelectric inertial translation to produce a …
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Synthesis and Characterization of Branched and Hyperbranched Polyetherimides and Selective Chemistry on the Nanolithographically Defined Silicon(100) Surface
… on the Si(100)-2 x 1 surface. Using the tip of a scanning tunneling microscope (STM) as a localized electron beam, hydrogen can be site selectively removed from the hydrogen-terminated Si(100)-2 x 1 surface in ultrahigh vacuum (UHV) to expose nanometer sized, highly reactive ""templates"" of clean …
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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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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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Curvature driven phase separation in mixed ligand coated gold nanoparticles
… ordered structures are studied here through scanning tunneling microscope (STM) images, as a function of the gold core diameter, which is a measure of the particle's curvature. The packing of OT homoligand nanoparticles is found to have a head-group spacing of 0.54 nm, which differs from that …
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Exploring strongly interacting gapless states : cuprates, pair density waves, and fluctuating superconductivity
… quantum fluctuating PDW. We analyze a recent scanning tunneling microscope (STM) discovery of period-8 density waves in the vortex halo of the d-wave superconductor. We put it in the context of the broader pseudogap phenomenology, and compare the experimental results with various PDW-driven …
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Scanning probe microscopy with inherent disturbance suppression using micromechanical systems
All scanning probe microscopes (SPMs) are affected by disturbances, or mechanical noise, in their environments which can limit their imaging resolution. This thesis introduces a general approach for suppressing out-of-plane disturbances that is applicable to non-contact and intermittent contact SPM …
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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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Quantum dynamical study of Si(100) surface-mounted, STM-driven switches at the atomic and molecular scale
… the quantum dynamical study of two examples of scanning tunneling microscope (STM)-controllable, Si(100)(2x1) surface-mounted switches of atomic and molecular scale. The first example considers the switching of single H-atoms between two dangling-bond chemisorption sites on a Si-dimer of the …
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Design and fabrication of nanotweezers for nanomanipulation
… not possible to see at this scale using optical microscopes. The Scanning Tunneling Microscope (STM) and the Atomic Force Microscope (AFM) are widely used tools for visualization at this scale and serve as the eyes into the nano-world. The ability to probe, manipulate, and construct at this scale …
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Nanoscale Manipulation of Pristine and Functionalized Freestanding Graphene Using Scanning Tunneling Microscopy
… freestanding graphene can be imaged using a scanning tunneling microscope (STM) and that imaging a flexible 2D surface is fundamentally different from imaging a bulk material due to the attraction between the STM tip and the sample. This attraction can be used to manipulate the graphene …
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Scanning tunneling microscopy and spectroscopy of nanometer scale metallic features on silicon surfaces
… thesis, I have used an ultrahigh vacuum (UHV) scanning tunneling microscope (STM) to fabricate nanometer scale metallic features on the Si(100)-2×1:H surface and form nanoscale metal contacts on the SWNTs. Scanning tunneling spectroscopy (STS) is used to study the electronic properties of the …
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Temperature-dependent structures of heteroepitaxial metallo-phthalocyanine (Mpc, M = Cu, Fe) thin films on silver.
… and structure of the MPcs were studied by scanning tunneling microscope (STM). Submonolayer (sub-ML) MPcs deposited at room temperature (RT) without subsequent annealing did not form ordered film regions. After annealing the sub-ML films to 500 K for 30 minutes, ordered regions as well as …
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Fabrication of Tungsten Tips Suitable for Scanning Probe Microscopy by Electrochemical Etching Methods
… the surface of materials play a key role in the scanning tunneling microscope (STM) technique. It's remarkable quality that it is used to study the surface of material at the atomic level.</p> <p>There are various methods used in the tips fabrication process. Of diverse methods, three different …
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Single molecule optical absorption by STM and a new algorithm for solving dynamics on a free energy surface
… of the high spatial resolution of the scanning tunneling microscope (STM) and the spectral resolution of a laser provides a powerful tool for probing the local optical and electronic properties of materials. Optical absorption detected by STM offers direct imaging of molecular …
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