We investigated the field emission characteristics of patterned carbon nanotubes (CNTs) on KOVAR substrates with different surface morphologies. The substrate with a micro-sized random pattern was fabricated through chemical wet etching, whereas the substrate with a nano-sized random pattern was formed by surface roughening process of polymer and chemical wet etching. The field emission characteristics of these substrates were the compared with those of non-treated substrates. It was clearly revealed that the field emission characteristics of CNTs were influenced by the surface morphology of the cathode substrate. When the surface of cathode was modified by random pattern, the modified substrate provided a large surface area and a wider print area. Also, the modified surface morphology of the cathode provided strong adhesion between the CNT paste and the cathode. Particularly, the substrate with the nano-sized random pattern showed that the turn-on field value decreases and the field enhancement factor value improves as compared with non-treated substrate.
Bibliographical noteFunding Information:
This work was supported by the Industrial Core Technology Development Program funded by the Ministry of Trade, industry, and Energy (No. 10037379, Development of Multi X-ray Source and Tomosynthesis System based on Nano Materials). The authors thank the staff of KBSI for technical assistance.
© 2015, Springer Science+Business Media Dordrecht.
- Few-walled carbon nanotubes
- Field emission characteristics
- Surface treatment
ASJC Scopus subject areas
- Atomic and Molecular Physics, and Optics
- Modelling and Simulation
- Materials Science(all)
- Condensed Matter Physics