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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...
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 authors have developed a new method to fabricate patterned W18O49 nanowire arrays by combination of thermal evaporation and lift-off technology. It is found that the phosphoric acid processing of the lift-off technology has strong effect on the field emission property of W18O49 nanowires.
Here we have successfully synthesized patterned W18O49 nanowire arrays in large scale by lift-off way, which has described in our report also to this conference. In order to remove the aluminum oxide layer, the sample was put into the phosphoric acid with a concentration of 60 % (volume ratio). The treatment time in 90°C water bath was usually about 4 hours. The treated and untreated tungsten oxide...
Tungsten oxide nanostructures have been paid much attention because of their particular physics and chemical properties. But until now, it is difficult to realize patterned growth of tungsten oxide nanowire arrays. In this paper, we demonstrate that tungsten oxide nanowire arrays can be controllably synthesized in patterned arrays at low temperature of 550°C by a simple ceramic template method. The...
W18O49 nanotip arrays were prepared by a two-step high-temperature, catalyst-free physical evaporation deposition process in high-purity argon gas. The prepared products were characterized by scanning electron microscopy, energy-dispersive spectroscopy, X-ray diffraction, X-ray photoelectron spectroscopy and transmission electron microscopy. Field emission measurements were carried out with a transparent...
In this paper, single tungsten oxide (WOx) nanotip has been welded on tungsten microtip by pulsed laser. Also, field emission characteristic and low resistance electrical contact were obtained using scanning electron microscopy (SEM)
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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