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Iron films with different thickness were prepared on glass substrate by DC magnetron sputtering. Arrays of α-Fe2O3 nanowires and nanosheets were grown on iron films by thermal oxidation. The morphology and structure of the prepared α-Fe2O3 nanostructures were characterized by SEM, XRD, XPS, Raman and HRTEM. Field emission properties including I-V characteristics, emission uniformity and stability...
In this study, large-area W18O49 pencil-like nanostructure arrays can be grown on silicon substrate by multi-step thermal evaporation process is demonstrated. A side view scanning electron micrograph of a typical W18O49 pencil-like nanostructure arrays (a) and the enlarged SEM image (b) of a nanotip, as well as their typical SAEDS spectrum (c) and typical XRD spectrum (d) is shown. The samples of...
Carbon nanotube (CNT) is a type of ideal cathode materials for field emission (FE) devices. Its outstanding field emission properties can be attributed to high field enhancement on the tip due to its large aspect ratio. Early works reported that the field enhancement of CNTs in an array is strongly suppressed due to the screening effect. Further study confirmed that to avoid the screening effect,...
ZnO nanowire films were grown on stainless-steel disc with a thin layer of Au as catalyst by thermal evaporation in a vacuum chamber. Morphology of the nanowires was investigated by scanning electron microscopy, while emission site distribution images were recorded by a CCD camera. The nanowires were then used as cathodes in a luminescent tube and its turn-on and threshold voltages and fields, and...
A Bayard-Alpert ionization gauge with a carbon nanotube (CNT) field emitter was fabricated and tested. CNTs were grown on stainless steel rods by thermal chemical vapor deposition at 900degC in a mixture of CH4 an H2 gas. The structure of the as-grown CNTs was investigated using scanning electron microscopy, transmission electron microscopy and Raman spectroscopy. The longtime field emission stability,...
Au-Ag nanoparticles are used as nanomasks for Si nanowires fabrication. Au-Ag alloy film deposited on Si substrate is annealed in H 2 ambient at a temperature of 750degC. The SiNWs were fabricated through a dry etching processing in an inductively coupled plasma (ICP) system. SEM images of the uniform vertically aligned silicon nanowire arrays show 50 to 100 nm nanowire diameter range and ~1.1 mum...
Diverse tungsten oxide nanostructures are prepared at different conditions of hot filament arrays thermal vapor method. The synthesized nanostructures are characterized using SEM, XRD and EDS. These structures exhibited high turn-on fields that may be due to the electrostatic screening effect caused by high energy density of tungsten oxide nanowire interlaced structure
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