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Enhanced interfacial reaction of silicon carbide fillers onto the metal substrate in carbon nanotube paste for reliable field electron emitters.
- Source :
-
Nanotechnology [Nanotechnology] 2021 May 07; Vol. 32 (19), pp. 190001. - Publication Year :
- 2021
-
Abstract
- Adhesion of carbon nanotube (CNT) onto a cathode substrate is very crucial for field electron emitters that are operating under high electric fields. As a supporting precursor of CNT field emitters, we adopted silicon carbide (SiC) nano-particle fillers with Ni particles and then enhanced interfacial reactions onto Kovar-alloy substrates through the optimized wet pulverization process of SiC aggregates for reliable field electron emitters. As-purchased SiC aggregates were efficiently pulverized from 20 to less than 1 micro-meter in a median value (D50). CNT pastes for field emitters were distinctively formulated by a mixing process of the pulverized SiC aggregates and pre-dispersed CNTs. X-ray photoelectron spectroscopy studies showed that the optimally pulverized SiC-CNT paste-emitter had a stronger Si 2p <superscript>3/2</superscript> signal in the Ni <subscript>2</subscript> Si phase than the as-purchased one. The Si 2p <superscript>3/2</superscript> signal would represent interfacial reaction of the SiC nano-particle onto Ni from the CNT paste and the Kovar substrate, forming the supporting layer for CNT emitters. The optimal paste-emitter even in a vacuum-sealed tube exhibited a highly reliable field emission current with a high current density of 100 mA cm <superscript>-2</superscript> for over 50 h along with good reproducibility. The enhanced interfacial reaction of SiC filler onto the metal substrates could lead to highly reliable field electron emitters for vacuum electronic devices.
Details
- Language :
- English
- ISSN :
- 1361-6528
- Volume :
- 32
- Issue :
- 19
- Database :
- MEDLINE
- Journal :
- Nanotechnology
- Publication Type :
- Academic Journal
- Accession number :
- 33524956
- Full Text :
- https://doi.org/10.1088/1361-6528/abe1ef