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In this paper, thermal-catalytic chemical vapor deposition (thermal-CVD) is used to improve the quality of carbon nanotubes (CNTs) by varying the thickness of catalyst (Ni), processing time of the hydrogen treatment, flow rate of reaction gas (C2H2). And also the properties of CNTs on different buffer layers (W,Ti, etc) in microstructures on glass substrates are studied. The grown CNTs are examined...
In the present work, we presented our findings on enhancing field emission of low temperature solution phase grown ZnO NWs by using diamond like carbon (DLC) thin film.
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...
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,...
In this paper, alpha-Fe2O3 nanotips are successfully synthesized by thermal oxidation of iron film on ITO glass. The preparation method is simple and scalable for large area preparation. The alpha-Fe2O3 nanotips could be a promising field emitter for FED application after further optimization of field emission properties.
The influence of gas ambience on the CNT cold cathode has been studied in the vacuum packaging process. The CNTs film was destroyed at 450degC in air ambience and the CNT burned out fast beyond 510degC. The field emission characteristics got worse after the high temperature process.
In this work, we particularly demonstrate that ZnO nanotips can be formed from a sub-micro ZnO whisker by field emission treatment. The underlying physics are discussed.
The effects of field emission cycles applied on the screen printed carbon nanotube (CNT) cold cathode were studied. CNT emitters were vertically well aligned and the emission images were visibly improved after the field treatment. The mechanism of the treatment was investigated using scanning electron microscopy. The mechanism may involve the erasion of hot spot and alignment of CNT
The effect of post-deposition plasma etching on the field emission properties of screen-printed multiwalled carbon nanotube electron emitter arrays is investigated. Results prove that short time etching can effectively remove parts of the inorganic binder, aligns the carbon nanotubes and improve field emission properties
Field emission energy distribution (FEED) of an individual SWCNT shows multi-peak feature and confirms that electric field competes with temperature, resulting in no emission peak above Fermi energy. At a constant applied voltage, increasing temperature increases the intensity of all field emission peaks and shifts the peaks towards the higher energy. At a constant temperature, increasing the applied...
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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