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KMID : 1102020170470010036
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Applied Microscopy
2017 Volume.47 No. 1 p.36 ~ p.42
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The Effects of Dielectric Coatings on Electron Emission from Tungsten
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Al-Qudah Ala’a M.
Alnawasreh Shady S.
Madanat Mazen A.
Trzaska Oliwia
Matykiewicz Danuta
Alrawshdeh Saad S.
Hagmann Mark J.
Mousa Marwan S.
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Abstract
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Field electron emission measurements were performed on dielectric-coated tungsten emitters, with apex radii in the nanometer and micrometer range, which were prepared by electrochemical etching in NaOH solution. Measurements were performed in a field electron microscopy (FEM) with a base pressure <10?6 Pascal (10?8 mbar). Four different types of dielectric were used, namely: (1) Clark Electromedical Instruments epoxylite resin, (2) Epidian 6 produced by Ciech Sarzyna S. A., (3) a Radionox solution of colloidal graphite; and (4) Molyslip 2001 E compound (MoS2 and MoS). Current-voltage measurements and FEM images were used to investigate the characteristics of these composite emitters, and to assess how the different types of dielectric coating affect the suitability of the composite emitter as a potential electron source.
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KEYWORD
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Field electron emitter, Dielectric layers, Composite emitters, Field electron microscope
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