Synthesis of ultrafine silicon carbide nanoparticles using non‐thermal arc plasma at atmospheric pressure

Study of current attachment at thermionic cathode for TIG arc at atmospheric pressure is attempted from numerical calculations of arc-electrodes unified model. The calculations show that the maximum temperature of arc plasma close to the cathode tip for W-2% ThO2 reaches 19,000 K and it is the highest value in comparison with the other temperatures for W-2% La2O3 and W-2% CeO2, because the current attachment at the cathode tip is constricted by a centralized limitation of liquid area of ThO2 due to its higher melting point. The calculations also show that, in cases of W- 2% La2O3 and W-2% CeO2, the liquid areas of La2O3 and Ce2O3 are widely expanded at the cathode tip due to their lower melting points and then produce uniform current attachments at the cathode. It is concluded that the current attachment at thermionic cathode is strongly dependent on work function, melting point and Richardson constant of emitter materials.

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Static and Motional Feedthrough Capacitance of Flexural Microresonator

Active and Passive Electronic Components ◽

10.1155/2011/546986 ◽

2011 ◽

Vol 2011 ◽

pp. 1-6

Author(s):

Wen-Teng Chang

Keyword(s):

Silicon Carbide ◽

Atmospheric Pressure ◽

Network Analyzer ◽

Reduced Pressure ◽

Flexural Mode ◽

Microelectromechanical System ◽

Order Of Magnitude ◽

Bode Plots

The present paper evaluates the static and motional feedthrough capacitance of a silicon carbide-based flexural-mode microelectromechanical system resonator. The static feedthrough capacitance was measured by a network analyzer under atmospheric pressure. The motional feedthrough was obtained by introducing various values into the modeling circuit in order to fit the Bode plots measured under reduced pressure. The static feedthrough capacitance was 0.02 pF, whereas the motional feedthrough capacitance of an identical device was about 0.2 pF, which is one order of magnitude larger than the static feedthrough capacitance.

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Direct Observation of Transition from Solid-State to Molecular-Like Optical Properties in Ultrasmall Silicon Carbide Nanoparticles

The Journal of Physical Chemistry C ◽

10.1021/acs.jpcc.8b07826 ◽

2018 ◽

Vol 122 (46) ◽

pp. 26713-26721 ◽

Cited By ~ 3

Author(s):

David Beke ◽

Anna Fučíková ◽

Tibor Z. Jánosi ◽

Gyula Károlyházy ◽

Bálint Somogyi ◽

...

Keyword(s):

Silicon Carbide ◽

Optical Properties ◽

Solid State ◽

Direct Observation ◽

Silicon Carbide Nanoparticles

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Синтез наночастиц карбида кремния методом лазерного пиролиза смеси моносилана и ацетилена

Физика и техника полупроводников ◽

10.21883/ftp.2020.11.50094.9476 ◽

2020 ◽

Vol 54 (11) ◽

pp. 1233

Author(s):

И.А. Ершов ◽

Л.Д. Исхакова ◽

В.И. Красовский ◽

Ф.О. Милович ◽

С.И. Расмагин ◽

...

Keyword(s):

Silicon Carbide ◽

Gas Phase ◽

Reaction Zone ◽

Phase Reaction ◽

Synthesis Reaction ◽

Flow Ratio ◽

Laser Synthesis ◽

Gas Phase Reaction ◽

Silicon Carbide Nanoparticles ◽

Sic Particles

The conditions of the laser-enhanced synthesis reaction of silicon carbide nanoparticles are determined and the nanoparticles are characterized. The gas-phase reaction of laser synthesis of SiC particles is observed at SiH4/C2H2 flow ratio in the range of 1.6-3.2. The temperature in the reaction zone was ~1400--1500ºC. Silicon carbide nanoparticles ~6 nm in diameter are produced and their composition is studied.

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