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Showing 1 to 20 of 200 for “"atomic force microscope"”.
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A metrological atomic force microscope
… fabrication, and testing of a metrological atomic force microscope (AFM). This design serves as a prototype for a similar system that will later be integrated with the Sub-Atomic Measuring Machine (SAMM) under development in collaboration with the University of North Carolina at Charlotte. …
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Tip steering of the Atomic Force Microscope.
The Atomic Force Microscope (AFM) is a powerful tool for the imaging of extremely small objects on the scale of nanometers, like carbon nanotubes and strands of DNA. There currently is a need for methods to actively steer the probe tip of the AFM in order to greatly reduce the time required to …
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CRYOGENIC ATOMIC FORCE MICROSCOPE FOR CHARACTERIZATION OF NANOSTRUCTURES
… the design and applications of a cryogenic atomic force microscope (AFM) for characterization of nanostructures. The cryogenic AFM with a conductive tip can measure DC current through nanostructures. We use quartz tuning fork (QTF) as the force sensor. Unique coarse z motor design provides …
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A modular atomic force microscope for nanotechnology research
The atomic force microscope (AFM) has become an essential tool in a wide range of fields, from materials science and semiconductor research to molecular biology. Various research efforts have enhanced the capabilities of this powerful instrument, which has enabled new insights into nanoscale …
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Optical system for high-speed Atomic Force Microscope
… cantilever deflection sensor for a high speed Atomic Force Microscope (AFM). This optical sensing system is able to track a small cantilever while the X-Y scanner moves in the X-Y plane at 1KHz over a large range of 50x50 microns. To achieve these requirements, we evaluated a number of design …
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Development of the Evanescent Wave Atomic Force Microscope
The conventional atomic force microscope (AFM) is equipped with a single optical detection system. Probe-sample separation is determined in an independent deflection with respect to AFM z-translation experiment. This method of determining probe-surface separation is relative, susceptible to drift …
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Atomic Force Microscope Conductivity Measurements of Single Ferritin Molecules
<p>Conductive Atomic Force Microscope (c-AFM) was used to measure the conductivity of single horse spleen ferritin (HoSF) and azotobacter vinelandii bacterial ferritin (AvBF) molecules deposited on flat gold surfaces. A 500 micron diameter gold ball was also used as a contact probe to measure the …
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On advancement of high speed atomic force microscope technology
High speed atomic force microscopy (AFM) is a developing process in which nanoscale objects, such as crystal structures or strands of DNA, can be imaged at rates fast enough to watch processes as they occur. Although current generation AFM is already pivotal in many fields of research and industry, …
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Investigation of biological macromolecules using atomic force microscope-based techniques
The atomic force microscope (AFM) provides a powerful instrument for investigating and manipulating biological samples down to the subnanometer scale. In contrast to other microscopy methods, AFM does not require labeling, staining, nor fixation of samples and allows the specimen to be fully …
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Low-dimensional electron systems fabricated with an atomic force microscope
… is exploited in this research, where an atomic force microscope (AFM) performs local anodic oxidation on the surface of a shallow GaAs/ AlGaAs heterostructure. At cryogenic temperatures the resulting oxide lines define in-plane electrostatic gates of submicron size, and one-dimensional …
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Color imaging segmentation for automatic alignment of Atomic Force Microscope
Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2001.
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Custom built atomic force microscope for nitrogen-vacancy diamond magnetometry
… probes by combining this sensor with Atomic Force Microscopy (AFM) is described. A custom AFM was built that allows optical monitoring of the cantilever tip and collection of fluorescence with a high-NA objective from the same side. The AFM has a large open bottom and top and thus …
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Design and analysis of a monolithic flexure atomic force microscope
… and testing of a sub-nanometer accuracy atomic force microscope. It was made to be integrated into the Sub-Atomic Measuring Machine (SAMM) in collaboration with the University of North Carolina at Charlotte (UNCC). The microscope uses a tuning fork sensor to gauge its proximity to the …
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Lithography Using an Atomic Force Microscope and Ionic Self-assembled Multilayers
… scale. Various methods of nanolithography using atomic force microscopes (AFMs) are investigated. The use of AFMs beyond their imaging capabilities is demonstrated in various experiments involving nanografting and surface electrochemical modification. The use of an AFM to manipulate a monolayer …
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Measuring the electrostatic repulsion forces between glycosaminoglycans using the atomic force microscope
Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Materials Science and Engineering, 1999.
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Design and control optimization for high-speed jumping mode Atomic Force Microscope
… thesis, I improved the design of a high-speed Atomic Force Microscope (AFM) for jumping mode operation. The relations between important imaging parameters and physical limitations of the system were established first to identify the aspects of improvement. Two control algorithms to improve the …
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Design and control of high-speed and large-range atomic force microscope
… design, control and instrumentation of a novel atomic force microscope (AFM). This AFM is capable of high-speed imaging while maintaining large out-of-plane and lateral scan ranges. The primary contributions of this thesis include the design and implementation of a high-speed and large-range …
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