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Showing 1 to 20 of 54 for “"Focused Ion Beam (FIB)"”.
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Mechanisms of focused ion beam (FIB) material removal and rearrangement at high beam flux
Focused ion beam (FIB) is widely used as a material removal tool for applications ranging from electron microscope sample preparation to nanopore processing for DNA sequencing. Despite the wide spread use of FIB, the basic material removal mechanisms are not well understood and may depend upon FIB …
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Unique Approaches to Interfacial Nanoscience
Other applications of the nanofabrication techniques are also explored. The nanopatterning of mica with a focused ion beam (FIB), shown for the first time here, has led to the formation of a wide variety of nanorod structures embedded in and supported by a number of different surfaces. The …
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A Nano-Scale Chemical and Structural Characterization of Chinook Salmon (Oncorhynchus tshawytscha) Otoliths Using a FIB and HRTEM
We used a focused ion beam (FIB) to create thin sections from the post-hatch and core regions of Chinook salmon (Oncorhynchus tshawytscha) otoliths. The nano-scale chemistry and structure of these regions was characterized in thin section using scanning electron microscopy (SEM) in conjunction with …
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Nanostructure fabrication by electron and ion beam patterning of nanoparticles
Two modes of energetic beam-mediated fabrication have been investigated, namely focused ion beam (FIB) direct-writing of nanoparticles, and a technique for electrostatically patterning ionized inorganic nanoparticles, termed nanoxerography. A FIB has been used to directly pattern thin films of …
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Micro and nano composites composed of a polymer matrix and a metal disperse phase.
… in polymer + metal composites. The concentration of micrometric (Al, Ag and Ni) as well as nanometric particles (Al and Ag) was varied from 0 to 10 %. Composites were prepared by blending followed by injection molding. The resulting samples were analyzed by scanning electron microscopy (SEM) …
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Characterization of ionic liquid ion sources for focused ion beam applications
In the Focused Ion Beam (FIB) technique, a beam of ions is reduced to nanometer dimensions using dedicated optics and directed to a substrate for patterning. This technique is widely used in micro- and nanofabrication for etching, material deposition, microscopy, and chemical surface analysis. …
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Design and Fabrication of Nanofluidic Systems with Integrated Sensing Electrodes for Rapid Biomolecule Characterization
… Atomic Force Microscopy (AFM) nanolithography, Focused Ion Beam (FIB) milling and metal deposition, and standard microfabrication processing. The fabrication process started with the evaporation of chrome/gold (Cr/Au) onto a Pyrex 7740 wafer followed by photolithography and wet etching of the …
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The mechanism of thin film Si nanomachining using femtosecond laser pulses
Femtosecond (fs) laser ablation has been the subject of intense recent research. The pulse time ('width') is shorter than the electronic relaxation time, resulting in a decoupling of the period of laser illumination and the melting of the substrate. Since the laser does not directly heat the …
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The fabrication of nano-scale engineered surfaces to investigate the enhancement of boiling heat transfer and CHF in nuclear reactors
… for improvement on the safety margins and operation at higher power. The exact procedure for growing the nanowires will be delineated such that the results can be replicated exactly. A variety of ZnO NW structures will be fabricated based on the characteristic size of the features and …
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Electronic properties of Bi nanowaves
… through the thick oxide coating using a focused ion beam (FIB) to sputter away the oxide and then deposit contacts. By combining the FIB techniques with electron beam lithography we achieve contacts stable from 300K to 2K for nanowires less than 100nm in diameter. Annealing in H2 and also …
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CERAMIC MATERIALS USED IN SOLID-OXIDE FUEL CELLS
… fuel cells (SOFC) are electrochemical conversion devices to convert electricity directly from oxidizing a fuel with high efficiency and low emission. . The triple-phase-boundaries (TPBs), where cathode and electrolyte make contact with gas phase, are considered to be the active sites for …
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Characterization of an iodine-based ionic liquid ion source and studies on ion fragmentation
… a well studied source of charged droplets and ions. A specific subclass is the ionic liquid ion source (ILIS), which produce ion beams from the electrostatically stressed meniscus of ionic liquids. ILIS have several applications, two of which include space propulsion and focused ion beam …
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Individual Carbon Nanotube Probes And Field Emitters Fabrication And T
… (CNT) in 1999, they have attracted much attention due to their unique mechanical and electrical properties and potential applications. Yet their nanosize makes the study of individual CNTs easier said than done. In our laboratory, carbon fibers with nanotube cores have been synthesized with …
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Spectroscopic studies of high-temperature superconductors on planar tunnel junction devices and nanofabricated point contact junctions
… Two powerful methods for this investigation are tunneling spectroscopy and point contact spectroscopy. The tunneling spectroscopy directly probes the density of states whereas the point contact spectroscopy detects the sample properties via quasiparticle scattering. Two new approaches to …
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Progress towards quantitative dopant profiling with the scanning electron microscope
… is to obtain an accurate quantitative two-dimensional dopant profiling technique with high spatial resolution. Secondary electron (SE) imaging in the scanning electron microscope (SEM) has been shown to be a very promising technique for dopant profiling in the past. However, the limited accuracy …
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Investigation of Fine-scaled Alpha Precipitation in the Modeled Ti-Mo and Ti-Mo-Al Alloys
… biomedical materials. The size scale, distribution, and volume fraction of the precipitated phase in the parent phase matrix are all significant elements of these alloys' microstructure that have an impact on their performance. Therefore, a comprehensive understanding of microstructural …
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Investigating the Existence of Coherent Phonon Scattering in Silicon Using Phononic Crystals
… by phonons, which are discrete lattice vibrations. Phonon scattering due to the presence of voids in silicon can further alter the materials thermal conductivity. There is a question about the possibility of some of this scattering being coherent rather than purely incoherent. Coherent phonon …
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Laser-induced forward transfer techniques for printing functional materials and photonic devices
… materials for energy harvesting applications. A nanosecond shadowgraphy technique was used to study the triazene polymer (TP)-dynamic release layer (DRL) assisted LIFT technique for solid-phase ceramic materials namely gadolinium gallium oxide (Gd-Ga-O) and ytterbium doped yttrium …
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Nanofabrication using focused ion beam
Focused ion beam (FIB) technique uses a focused beam of ions to scan the surface of a specimen, analogous to the way scanning electron microscope (SEM) utilizes electrons. Recent developments in the FIB technology have led to beam spot size below 10 nm, which makes FIB suitable for nanofabrication. …
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Nitride semiconductors studied by atom probe tomography and correlative techniques
… efficient devices, the structure and composition of the constituent materials must be well-characterised. Traditional microscopy techniques used to examine nitride semiconductors include transmission electron microscopy (TEM), and atomic force microscopy (AFM). This thesis describes the study …
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