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In this study, we are focusing on the detailed control of the size and density of nanoparticles on the substrate by employing the gas-phase catalyst. To fabricate iron (Fe) nanoparticles as catalyst, Fe(CO)5 gas was used. Size and density of the nanoparticles can be controlled by varying the experimental parameters, such as the molar flow rate, the decomposition temperature and the flow time. Quartz...
In this paper we present a simple but powerful one-step growth method of ultra-long vertically aligned multi-walled CNT (MWNT) array, and its possible applications. Our growth method requires no additional process for catalyst thin film (pre-deposition), and only requires iron chloride powder and acetylene gas. We also present the results of electrical properties of MWNT array, such as electrical...
In this paper, in order to improve the emission efficiency and understand the emission mechanism MOS cathodes are fabricated based on nanocrystalline Si (nc-Si) prepared by a pulsed laser ablation (PLA) technique and investigated their emission properties. The cathode is composed of nc-Si covered with a thin oxide film sandwiched between an n-type silicon substrate as an electron source and a thin...
A metal-oxide-semiconductor cathode has been fabricated based on nanocrystalline silicon prepared by a pulsed laser ablation technique. The emission current and the transfer ratio are sensitive to the thickness of the gate electrode. Electron emission occurs at the extraction voltage as low as the work function of the top electrode. The transfer ratio is improved to 4% by reducing the thinness to...
Bright electron emission of the order of 1012 Asr-1m-2 is obtained from graphite nano-needle (GRANN) cathode. The performance of the GRANN cathode is demonstrated by the construction of a pulse X-ray generator and a field emission scanning electron microscope (SEM) at high residual pressure of the order of 10-5 torr
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