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In the present paper, the field emission cathodes of planar-type on the base of diamond-carbon composite are studied. Carbon was deposited inside porous dielectric diamond compacts which were fabricated by diamond particles pressing.
In this study, we fabricated a cathode using screen printing method with carbon nanotubes and ZnO nanotetrapods as cathode emission materials and CsI nanoparticles as coating materials. After several comparative experiments, we find that 3g CsI dispersed into an organic paste which is composed of 20ml terpineol and 1g ethyl cellulose has significant results to improve the performance of the field...
In this work, vacancies diffusion length scale or the size of the nanostructures involved during oxidation when utilizing the Kirkendall phenomenon is presented. Ni nanowires with different diameters are formed by electrodeposition of Ni into anodic aluminium oxide (AAO) membrane. The oxidation of the dispersed Ni nanowires is carried out either via rapid thermal oxidation (RTO) or conventional furnace...
We developed a solution-processed ionic liquid functionalized carbon nanoparticles (ILCNs) material which was synthesized by electrochemical exfoliation graphite electrode in ionic liquid and water mixture solution. The sp2-bonds electronic structure of the carbon nanoparticles in ILCNs can decrease tunneling barrier height.
This paper studies the preparation procedure of nanostructured (LaxBa1-x)B6 cathode materials by liquid phase reactive spark plasma sintering. The phase identification and purity of the sintered samples is determined by X-ray diffraction (XRD) and X-ray fluorescence. The vibrational property is examined by using Raman spectroscopy. The SEM and electron back-scattered diffraction (EBSD) investigation...
This paper presents direct growth approach for production of graphene and carbon nanotubes in an on-chip manner towards integrated devices. Vertically aligned arrays of carbon nanotubes and edge-oriented graphene are synthesized by microwave plasma-enhanced chemical vapor deposition using methane and hydrogen as precursors. Cyclic voltammetry (CV) and electrochemical energy impedance measurements...
In this paper large area tungsten trioxide (WO3) nanosheets and nanoribbons are synthesized by directly heating tungsten plates covered with potassium iodide (KI). The field emission properties of the as-grown samples are systematically measured. A 10 μA/cm current density is obtained from both samples under a 5.5 V/μm average field, while the average fields that extracted a current density of 1.0...
In this study, the field electron emission from the vertically well-aligned CNTs catalytically synthesized in liquid methanol was measured to determine the relation between the emission properties and their morphologies. Heavily doped n-type silicon (Si) wafers with a low resistivity less than 0.02 Ω cm were used as a substrate for the CNT growth. The morphology and fine structure of the grown CNTs...
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...
For the application of field emission (FE), W18O49 nanostructures have exhibited excellent FE behaviors among tungsten oxides, which promise a much better future. However, many difficulties remain to be overcome in their application in devices. One of them is that synthesis of nanostructures in uniform W18O49 phase is difficult; tungsten oxides have tens of different phases, which can results in their...
In this paper a nominal composition of 1 at% Cr-doped ZnO nanorods is synthesized by a HHPMF method. Both the samples fabricated with and without high pulsed magnetic field exhibit well ferromagnetic behaviors at room temperature. The high pulsed magnetic field not only makes the nanocrystalline size uniform, but also enhances the saturation magnetisation of the Cr-doped ZnO diluted magnetic semiconductors.
Transparent electrodes, for instance ITO (indium tin oxide), are used in electronic devices such as touch screen, flat panel display, and solar cell technologies. It is costly to pattern and has a tendency to crack when used due to its brittle nature. The development of technologies to deliver low cost flexible alternatives using single walled carbon nanotubes (CNTs) are fledgling but has a promising...
In this paper, a prototype UV detector of MSM (metal-semiconductor-metal) structure based ZnO nanowires film was designed and fabricated, and then tested under UV illumination.
In the present work, experiments have been carried out to study locally-grown ZnO nanowires on the drain-electrode of MOSFET by low-temperature solution-phase method and the effect of active control on field electron emission.
Intensive investigation on WO3-x nanostructures has been carried out in the last decade because they possess extraordinary properties. Especially for application in field emission, W18O49 nanostructures have exhibited excellent performance. Some issues have to be addressed in fabricating vacuum microelectronic devices using W18O49 nanostructures, including how to realize well aligned nanostructure...
The preparation of birnessite manganese dioxides (MnO2) nanoflakes films on Ti substrate by hydrothermal method were studied in this paper. The structure and morphology were characterized by XRD and SEM. In conclusion, the material may have the great potential application as supercapacitor material.
In this work, we report the fabrication of aligned CNT/Ni/W composite materials. The vertically aligned CNTs are grown on Si by plasma enhanced chemical vapour deposition using Ni films as catalysts. The Ni-W alloys are then filled into the gaps between the CNT forests by electroplating, forming a dense, low-stress composite film. Their mechanical properties are investigated by nanoindentation technique...
The paper presents the growth and optimization of carbon nanotube (CNT) and CNT/zinc oxide nanostructures to produce novel electron sources. The emitters studied in this project are based on regular array of vertically aligned 5 μm height and 50 nm diameter CNTs with a pitch of 10 μm. Such a cathode design allows to minimize electric field shielding effects and thus help in optimizing the emitted...
This paper presents synthesis and characterization of conducting polypyrrole-multi-walled carbon nanotube films co-depositing onto nickel electrode substrate. The electrochemical polymerization of pyrrole is performed in 100ml aqueous solution containing 0.2M pyrrole, 0.05M AOT and 0.01g multiwalled carbon nanotubes using three-electrode system. The SEM and cyclic voltammetry analysis show that the...
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